drivers/char/mem.c: cleanups
- fix switch statement layout - fix whitespace stuff - fix comment layout - remove unneeded inlining - use __weak - remove trailing whitespace - move uncached_access() inside `#ifndef __HAVE_PHYS_MEM_ACCESS_PROT' - it is otherwise unused. Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Cc: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrew Morton
Linus Torvalds
parent
dcefafb6ac
commit
d7d4d849b4
1 changed files with 102 additions and 102 deletions
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@ -3,7 +3,7 @@
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* Added devfs support.
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* Added devfs support.
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* Jan-11-1998, C. Scott Ananian <cananian@alumni.princeton.edu>
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* Shared /dev/zero mmapping support, Feb 2000, Kanoj Sarcar <kanoj@sgi.com>
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*/
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@ -44,36 +44,6 @@ static inline unsigned long size_inside_page(unsigned long start,
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return min(sz, size);
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}
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/*
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* Architectures vary in how they handle caching for addresses
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* outside of main memory.
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*
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*/
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static inline int uncached_access(struct file *file, unsigned long addr)
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{
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#if defined(CONFIG_IA64)
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/*
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* On ia64, we ignore O_DSYNC because we cannot tolerate memory attribute aliases.
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*/
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return !(efi_mem_attributes(addr) & EFI_MEMORY_WB);
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#elif defined(CONFIG_MIPS)
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{
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extern int __uncached_access(struct file *file,
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unsigned long addr);
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return __uncached_access(file, addr);
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}
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#else
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/*
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* Accessing memory above the top the kernel knows about or through a file pointer
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* that was marked O_DSYNC will be done non-cached.
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*/
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if (file->f_flags & O_DSYNC)
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return 1;
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return addr >= __pa(high_memory);
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#endif
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}
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#ifndef ARCH_HAS_VALID_PHYS_ADDR_RANGE
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static inline int valid_phys_addr_range(unsigned long addr, size_t count)
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{
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@ -115,15 +85,15 @@ static inline int range_is_allowed(unsigned long pfn, unsigned long size)
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}
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#endif
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void __attribute__((weak)) unxlate_dev_mem_ptr(unsigned long phys, void *addr)
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void __weak unxlate_dev_mem_ptr(unsigned long phys, void *addr)
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{
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}
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/*
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* This funcion reads the *physical* memory. The f_pos points directly to the
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* memory location.
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* This funcion reads the *physical* memory. The f_pos points directly to the
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* memory location.
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*/
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static ssize_t read_mem(struct file * file, char __user * buf,
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static ssize_t read_mem(struct file *file, char __user *buf,
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size_t count, loff_t *ppos)
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{
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unsigned long p = *ppos;
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@ -140,10 +110,10 @@ static ssize_t read_mem(struct file * file, char __user * buf,
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if (sz > 0) {
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if (clear_user(buf, sz))
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return -EFAULT;
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buf += sz;
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p += sz;
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count -= sz;
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read += sz;
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buf += sz;
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p += sz;
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count -= sz;
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read += sz;
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}
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}
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#endif
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@ -157,9 +127,9 @@ static ssize_t read_mem(struct file * file, char __user * buf,
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return -EPERM;
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/*
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* On ia64 if a page has been mapped somewhere as
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* uncached, then it must also be accessed uncached
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* by the kernel or data corruption may occur
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* On ia64 if a page has been mapped somewhere as uncached, then
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* it must also be accessed uncached by the kernel or data
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* corruption may occur.
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*/
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ptr = xlate_dev_mem_ptr(p);
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if (!ptr)
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@ -180,7 +150,7 @@ static ssize_t read_mem(struct file * file, char __user * buf,
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return read;
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}
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static ssize_t write_mem(struct file * file, const char __user * buf,
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static ssize_t write_mem(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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unsigned long p = *ppos;
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@ -212,9 +182,9 @@ static ssize_t write_mem(struct file * file, const char __user * buf,
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return -EPERM;
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/*
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* On ia64 if a page has been mapped somewhere as
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* uncached, then it must also be accessed uncached
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* by the kernel or data corruption may occur
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* On ia64 if a page has been mapped somewhere as uncached, then
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* it must also be accessed uncached by the kernel or data
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* corruption may occur.
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*/
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ptr = xlate_dev_mem_ptr(p);
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if (!ptr) {
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@ -242,13 +212,46 @@ static ssize_t write_mem(struct file * file, const char __user * buf,
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return written;
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}
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int __attribute__((weak)) phys_mem_access_prot_allowed(struct file *file,
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int __weak phys_mem_access_prot_allowed(struct file *file,
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unsigned long pfn, unsigned long size, pgprot_t *vma_prot)
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{
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return 1;
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}
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#ifndef __HAVE_PHYS_MEM_ACCESS_PROT
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/*
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* Architectures vary in how they handle caching for addresses
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* outside of main memory.
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*
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*/
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static int uncached_access(struct file *file, unsigned long addr)
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{
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#if defined(CONFIG_IA64)
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/*
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* On ia64, we ignore O_DSYNC because we cannot tolerate memory
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* attribute aliases.
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*/
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return !(efi_mem_attributes(addr) & EFI_MEMORY_WB);
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#elif defined(CONFIG_MIPS)
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{
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extern int __uncached_access(struct file *file,
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unsigned long addr);
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return __uncached_access(file, addr);
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}
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#else
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/*
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* Accessing memory above the top the kernel knows about or through a
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* file pointer
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* that was marked O_DSYNC will be done non-cached.
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*/
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if (file->f_flags & O_DSYNC)
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return 1;
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return addr >= __pa(high_memory);
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#endif
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}
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static pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
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unsigned long size, pgprot_t vma_prot)
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{
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@ -294,7 +297,7 @@ static const struct vm_operations_struct mmap_mem_ops = {
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#endif
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};
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static int mmap_mem(struct file * file, struct vm_area_struct * vma)
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static int mmap_mem(struct file *file, struct vm_area_struct *vma)
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{
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size_t size = vma->vm_end - vma->vm_start;
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@ -329,7 +332,7 @@ static int mmap_mem(struct file * file, struct vm_area_struct * vma)
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}
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#ifdef CONFIG_DEVKMEM
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static int mmap_kmem(struct file * file, struct vm_area_struct * vma)
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static int mmap_kmem(struct file *file, struct vm_area_struct *vma)
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{
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unsigned long pfn;
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@ -337,9 +340,9 @@ static int mmap_kmem(struct file * file, struct vm_area_struct * vma)
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pfn = __pa((u64)vma->vm_pgoff << PAGE_SHIFT) >> PAGE_SHIFT;
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/*
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* RED-PEN: on some architectures there is more mapped memory
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* than available in mem_map which pfn_valid checks
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* for. Perhaps should add a new macro here.
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* RED-PEN: on some architectures there is more mapped memory than
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* available in mem_map which pfn_valid checks for. Perhaps should add a
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* new macro here.
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*
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* RED-PEN: vmalloc is not supported right now.
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*/
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@ -389,7 +392,7 @@ static ssize_t read_oldmem(struct file *file, char __user *buf,
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/*
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* This function reads the *virtual* memory as seen by the kernel.
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*/
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static ssize_t read_kmem(struct file *file, char __user *buf,
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static ssize_t read_kmem(struct file *file, char __user *buf,
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size_t count, loff_t *ppos)
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{
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unsigned long p = *ppos;
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@ -400,8 +403,8 @@ static ssize_t read_kmem(struct file *file, char __user *buf,
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read = 0;
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if (p < (unsigned long) high_memory) {
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low_count = count;
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if (count > (unsigned long) high_memory - p)
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low_count = (unsigned long) high_memory - p;
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if (count > (unsigned long)high_memory - p)
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low_count = (unsigned long)high_memory - p;
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#ifdef __ARCH_HAS_NO_PAGE_ZERO_MAPPED
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/* we don't have page 0 mapped on sparc and m68k.. */
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@ -465,9 +468,8 @@ static ssize_t read_kmem(struct file *file, char __user *buf,
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}
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static inline ssize_t
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do_write_kmem(unsigned long p, const char __user *buf,
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size_t count, loff_t *ppos)
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static ssize_t do_write_kmem(unsigned long p, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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ssize_t written, sz;
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unsigned long copied;
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@ -491,9 +493,9 @@ do_write_kmem(unsigned long p, const char __user *buf,
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sz = size_inside_page(p, count);
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/*
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* On ia64 if a page has been mapped somewhere as
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* uncached, then it must also be accessed uncached
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* by the kernel or data corruption may occur
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* On ia64 if a page has been mapped somewhere as uncached, then
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* it must also be accessed uncached by the kernel or data
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* corruption may occur.
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*/
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ptr = xlate_dev_kmem_ptr((char *)p);
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@ -514,11 +516,10 @@ do_write_kmem(unsigned long p, const char __user *buf,
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return written;
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}
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/*
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* This function writes to the *virtual* memory as seen by the kernel.
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*/
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static ssize_t write_kmem(struct file * file, const char __user * buf,
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static ssize_t write_kmem(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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unsigned long p = *ppos;
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@ -570,17 +571,17 @@ static ssize_t write_kmem(struct file * file, const char __user * buf,
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#endif
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#ifdef CONFIG_DEVPORT
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static ssize_t read_port(struct file * file, char __user * buf,
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static ssize_t read_port(struct file *file, char __user *buf,
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size_t count, loff_t *ppos)
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{
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unsigned long i = *ppos;
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char __user *tmp = buf;
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if (!access_ok(VERIFY_WRITE, buf, count))
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return -EFAULT;
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return -EFAULT;
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while (count-- > 0 && i < 65536) {
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if (__put_user(inb(i),tmp) < 0)
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return -EFAULT;
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if (__put_user(inb(i), tmp) < 0)
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return -EFAULT;
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i++;
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tmp++;
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}
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@ -588,22 +589,22 @@ static ssize_t read_port(struct file * file, char __user * buf,
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return tmp-buf;
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}
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static ssize_t write_port(struct file * file, const char __user * buf,
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static ssize_t write_port(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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unsigned long i = *ppos;
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const char __user * tmp = buf;
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if (!access_ok(VERIFY_READ,buf,count))
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if (!access_ok(VERIFY_READ, buf, count))
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return -EFAULT;
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while (count-- > 0 && i < 65536) {
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char c;
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if (__get_user(c, tmp)) {
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if (tmp > buf)
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break;
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return -EFAULT;
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return -EFAULT;
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}
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outb(c,i);
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outb(c, i);
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i++;
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tmp++;
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}
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@ -612,13 +613,13 @@ static ssize_t write_port(struct file * file, const char __user * buf,
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}
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#endif
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static ssize_t read_null(struct file * file, char __user * buf,
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static ssize_t read_null(struct file *file, char __user *buf,
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size_t count, loff_t *ppos)
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{
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return 0;
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}
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static ssize_t write_null(struct file * file, const char __user * buf,
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static ssize_t write_null(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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return count;
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@ -630,13 +631,13 @@ static int pipe_to_null(struct pipe_inode_info *info, struct pipe_buffer *buf,
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return sd->len;
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}
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static ssize_t splice_write_null(struct pipe_inode_info *pipe,struct file *out,
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static ssize_t splice_write_null(struct pipe_inode_info *pipe, struct file *out,
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loff_t *ppos, size_t len, unsigned int flags)
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{
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return splice_from_pipe(pipe, out, ppos, len, flags, pipe_to_null);
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}
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static ssize_t read_zero(struct file * file, char __user * buf,
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static ssize_t read_zero(struct file *file, char __user *buf,
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size_t count, loff_t *ppos)
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{
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size_t written;
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@ -667,7 +668,7 @@ static ssize_t read_zero(struct file * file, char __user * buf,
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return written ? written : -EFAULT;
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}
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static int mmap_zero(struct file * file, struct vm_area_struct * vma)
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static int mmap_zero(struct file *file, struct vm_area_struct *vma)
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{
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#ifndef CONFIG_MMU
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return -ENOSYS;
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@ -677,7 +678,7 @@ static int mmap_zero(struct file * file, struct vm_area_struct * vma)
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return 0;
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}
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static ssize_t write_full(struct file * file, const char __user * buf,
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static ssize_t write_full(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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return -ENOSPC;
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@ -688,8 +689,7 @@ static ssize_t write_full(struct file * file, const char __user * buf,
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* can fopen() both devices with "a" now. This was previously impossible.
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* -- SRB.
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*/
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static loff_t null_lseek(struct file * file, loff_t offset, int orig)
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static loff_t null_lseek(struct file *file, loff_t offset, int orig)
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{
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return file->f_pos = 0;
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}
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@ -702,31 +702,31 @@ static loff_t null_lseek(struct file * file, loff_t offset, int orig)
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* also note that seeking relative to the "end of file" isn't supported:
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* it has no meaning, so it returns -EINVAL.
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*/
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static loff_t memory_lseek(struct file * file, loff_t offset, int orig)
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static loff_t memory_lseek(struct file *file, loff_t offset, int orig)
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{
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loff_t ret;
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mutex_lock(&file->f_path.dentry->d_inode->i_mutex);
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switch (orig) {
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case SEEK_CUR:
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offset += file->f_pos;
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if ((unsigned long long)offset <
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(unsigned long long)file->f_pos) {
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ret = -EOVERFLOW;
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break;
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}
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case SEEK_SET:
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/* to avoid userland mistaking f_pos=-9 as -EBADF=-9 */
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if ((unsigned long long)offset >= ~0xFFFULL) {
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ret = -EOVERFLOW;
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break;
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}
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file->f_pos = offset;
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ret = file->f_pos;
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force_successful_syscall_return();
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case SEEK_CUR:
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offset += file->f_pos;
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if ((unsigned long long)offset <
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(unsigned long long)file->f_pos) {
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ret = -EOVERFLOW;
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break;
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default:
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ret = -EINVAL;
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}
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case SEEK_SET:
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/* to avoid userland mistaking f_pos=-9 as -EBADF=-9 */
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if ((unsigned long long)offset >= ~0xFFFULL) {
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ret = -EOVERFLOW;
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break;
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}
|
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file->f_pos = offset;
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ret = file->f_pos;
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force_successful_syscall_return();
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break;
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default:
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ret = -EINVAL;
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}
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mutex_unlock(&file->f_path.dentry->d_inode->i_mutex);
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return ret;
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@ -810,7 +810,7 @@ static const struct file_operations oldmem_fops = {
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};
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#endif
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static ssize_t kmsg_write(struct file * file, const char __user * buf,
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static ssize_t kmsg_write(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
|
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{
|
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char *tmp;
|
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|
|
@ -832,7 +832,7 @@ static ssize_t kmsg_write(struct file * file, const char __user * buf,
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}
|
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|
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static const struct file_operations kmsg_fops = {
|
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.write = kmsg_write,
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.write = kmsg_write,
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};
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|
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static const struct memdev {
|
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|
|
@ -883,7 +883,7 @@ static int memory_open(struct inode *inode, struct file *filp)
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}
|
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|
||||
static const struct file_operations memory_fops = {
|
||||
.open = memory_open,
|
||||
.open = memory_open,
|
||||
};
|
||||
|
||||
static char *mem_devnode(struct device *dev, mode_t *mode)
|
||||
|
|
@ -904,7 +904,7 @@ static int __init chr_dev_init(void)
|
|||
if (err)
|
||||
return err;
|
||||
|
||||
if (register_chrdev(MEM_MAJOR,"mem",&memory_fops))
|
||||
if (register_chrdev(MEM_MAJOR, "mem", &memory_fops))
|
||||
printk("unable to get major %d for memory devs\n", MEM_MAJOR);
|
||||
|
||||
mem_class = class_create(THIS_MODULE, "mem");
|
||||
|
|
|
|||
Loading…
Reference in a new issue