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sh: Wire up clear_user_highpage().

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With the kmap_coherent() API in place, this is trivial to implement,
and lets us avoid the cache flush in certain cases.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2007-11-05 16:12:32 +09:00
parent f966918724
commit 7747b9a493
2 changed files with 29 additions and 0 deletions
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23
arch/sh/mm/pg-sh4.c
View file

@ -9,6 +9,8 @@
#include <linux/mm.h>
#include <linux/mutex.h>
#include <linux/fs.h>
#include <linux/highmem.h>
#include <linux/module.h>
#include <asm/mmu_context.h>
#include <asm/cacheflush.h>
@ -79,6 +81,27 @@ void copy_user_page(void *to, void *from, unsigned long address,
}
}
void copy_user_highpage(struct page *to, struct page *from,
unsigned long vaddr, struct vm_area_struct *vma)
{
void *vfrom, *vto;
__set_bit(PG_mapped, &to->flags);
vto = kmap_atomic(to, KM_USER1);
vfrom = kmap_coherent(from, vaddr);
copy_page(vto, vfrom);
kunmap_coherent(vfrom);
if (((vaddr ^ (unsigned long)vto) & CACHE_ALIAS))
__flush_wback_region(vto, PAGE_SIZE);
kunmap_atomic(vto, KM_USER1);
/* Make sure this page is cleared on other CPU's too before using it */
smp_wmb();
}
EXPORT_SYMBOL(copy_user_highpage);
/*
* For SH-4, we have our own implementation for ptep_get_and_clear
*/

6
include/asm-sh/page.h
View file

@ -73,10 +73,16 @@ extern void copy_page_nommu(void *to, void *from);
#if !defined(CONFIG_CACHE_OFF) && defined(CONFIG_MMU) && \
(defined(CONFIG_CPU_SH4) || defined(CONFIG_SH7705_CACHE_32KB))
struct page;
struct vm_area_struct;
extern void clear_user_page(void *to, unsigned long address, struct page *pg);
extern void copy_user_page(void *to, void *from, unsigned long address, struct page *pg);
extern void __clear_user_page(void *to, void *orig_to);
extern void __copy_user_page(void *to, void *from, void *orig_to);
#ifdef CONFIG_CPU_SH4
extern void copy_user_highpage(struct page *to, struct page *from,
unsigned long vaddr, struct vm_area_struct *vma);
#define __HAVE_ARCH_COPY_USER_HIGHPAGE
#endif
#else
#define clear_user_page(page, vaddr, pg) clear_page(page)
#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)