d7c19b066d
Limit the number of kmemleak false positives by including
.data.ro_after_init in memory scanning. To achieve this we need to add
symbols for start and end of the section to the linker scripts.
The problem was been uncovered by commit 56989f6d85 ("genetlink: mark
families as __ro_after_init").
Link: http://lkml.kernel.org/r/1478274173-15218-1-git-send-email-jakub.kicinski@netronome.com
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Cong Wang <xiyou.wangcong@gmail.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
134 lines
4.5 KiB
C
134 lines
4.5 KiB
C
#ifndef _ASM_GENERIC_SECTIONS_H_
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#define _ASM_GENERIC_SECTIONS_H_
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/* References to section boundaries */
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#include <linux/compiler.h>
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#include <linux/types.h>
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/*
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* Usage guidelines:
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* _text, _data: architecture specific, don't use them in arch-independent code
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* [_stext, _etext]: contains .text.* sections, may also contain .rodata.*
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* and/or .init.* sections
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* [_sdata, _edata]: contains .data.* sections, may also contain .rodata.*
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* and/or .init.* sections.
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* [__start_rodata, __end_rodata]: contains .rodata.* sections
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* [__start_data_ro_after_init, __end_data_ro_after_init]:
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* contains data.ro_after_init section
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* [__init_begin, __init_end]: contains .init.* sections, but .init.text.*
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* may be out of this range on some architectures.
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* [_sinittext, _einittext]: contains .init.text.* sections
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* [__bss_start, __bss_stop]: contains BSS sections
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*
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* Following global variables are optional and may be unavailable on some
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* architectures and/or kernel configurations.
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* _text, _data
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* __kprobes_text_start, __kprobes_text_end
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* __entry_text_start, __entry_text_end
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* __ctors_start, __ctors_end
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*/
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extern char _text[], _stext[], _etext[];
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extern char _data[], _sdata[], _edata[];
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extern char __bss_start[], __bss_stop[];
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extern char __init_begin[], __init_end[];
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extern char _sinittext[], _einittext[];
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extern char __start_data_ro_after_init[], __end_data_ro_after_init[];
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extern char _end[];
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extern char __per_cpu_load[], __per_cpu_start[], __per_cpu_end[];
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extern char __kprobes_text_start[], __kprobes_text_end[];
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extern char __entry_text_start[], __entry_text_end[];
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extern char __start_rodata[], __end_rodata[];
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/* Start and end of .ctors section - used for constructor calls. */
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extern char __ctors_start[], __ctors_end[];
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extern __visible const void __nosave_begin, __nosave_end;
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/* function descriptor handling (if any). Override
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* in asm/sections.h */
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#ifndef dereference_function_descriptor
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#define dereference_function_descriptor(p) (p)
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#endif
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/* random extra sections (if any). Override
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* in asm/sections.h */
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#ifndef arch_is_kernel_text
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static inline int arch_is_kernel_text(unsigned long addr)
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{
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return 0;
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}
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#endif
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#ifndef arch_is_kernel_data
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static inline int arch_is_kernel_data(unsigned long addr)
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{
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return 0;
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}
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#endif
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/**
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* memory_contains - checks if an object is contained within a memory region
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* @begin: virtual address of the beginning of the memory region
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* @end: virtual address of the end of the memory region
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* @virt: virtual address of the memory object
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* @size: size of the memory object
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*
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* Returns: true if the object specified by @virt and @size is entirely
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* contained within the memory region defined by @begin and @end, false
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* otherwise.
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*/
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static inline bool memory_contains(void *begin, void *end, void *virt,
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size_t size)
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{
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return virt >= begin && virt + size <= end;
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}
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/**
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* memory_intersects - checks if the region occupied by an object intersects
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* with another memory region
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* @begin: virtual address of the beginning of the memory regien
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* @end: virtual address of the end of the memory region
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* @virt: virtual address of the memory object
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* @size: size of the memory object
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*
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* Returns: true if an object's memory region, specified by @virt and @size,
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* intersects with the region specified by @begin and @end, false otherwise.
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*/
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static inline bool memory_intersects(void *begin, void *end, void *virt,
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size_t size)
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{
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void *vend = virt + size;
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return (virt >= begin && virt < end) || (vend >= begin && vend < end);
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}
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/**
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* init_section_contains - checks if an object is contained within the init
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* section
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* @virt: virtual address of the memory object
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* @size: size of the memory object
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*
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* Returns: true if the object specified by @virt and @size is entirely
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* contained within the init section, false otherwise.
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*/
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static inline bool init_section_contains(void *virt, size_t size)
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{
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return memory_contains(__init_begin, __init_end, virt, size);
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}
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/**
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* init_section_intersects - checks if the region occupied by an object
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* intersects with the init section
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* @virt: virtual address of the memory object
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* @size: size of the memory object
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*
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* Returns: true if an object's memory region, specified by @virt and @size,
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* intersects with the init section, false otherwise.
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*/
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static inline bool init_section_intersects(void *virt, size_t size)
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{
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return memory_intersects(__init_begin, __init_end, virt, size);
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}
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#endif /* _ASM_GENERIC_SECTIONS_H_ */
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