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author | Thierry Reding <treding@nvidia.com> | 2016-01-16 01:58:18 +0100 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-01-16 20:17:24 +0100 |
commit | 979559362516bb0f5424505c607210ac054e30ae (patch) | |
tree | 1c0ba4cc67a030a54f2e1cb8082846f260578352 /include/asm-generic/sections.h | |
parent | kernel/stop_machine.c: remove CONFIG_SMP dependencies (diff) | |
download | linux-979559362516bb0f5424505c607210ac054e30ae.tar.xz linux-979559362516bb0f5424505c607210ac054e30ae.zip |
asm/sections: add helpers to check for section data
Add a helper to check if an object (given an address and a size) is part
of a section (given beginning and end addresses). For convenience, also
provide a helper that performs this check for __init data using the
__init_begin and __init_end limits.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-generic/sections.h')
-rw-r--r-- | include/asm-generic/sections.h | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h index b58fd667f87b..af0254c09424 100644 --- a/include/asm-generic/sections.h +++ b/include/asm-generic/sections.h @@ -4,6 +4,7 @@ /* References to section boundaries */ #include <linux/compiler.h> +#include <linux/types.h> /* * Usage guidelines: @@ -63,4 +64,68 @@ static inline int arch_is_kernel_data(unsigned long addr) } #endif +/** + * memory_contains - checks if an object is contained within a memory region + * @begin: virtual address of the beginning of the memory region + * @end: virtual address of the end of the memory region + * @virt: virtual address of the memory object + * @size: size of the memory object + * + * Returns: true if the object specified by @virt and @size is entirely + * contained within the memory region defined by @begin and @end, false + * otherwise. + */ +static inline bool memory_contains(void *begin, void *end, void *virt, + size_t size) +{ + return virt >= begin && virt + size <= end; +} + +/** + * memory_intersects - checks if the region occupied by an object intersects + * with another memory region + * @begin: virtual address of the beginning of the memory regien + * @end: virtual address of the end of the memory region + * @virt: virtual address of the memory object + * @size: size of the memory object + * + * Returns: true if an object's memory region, specified by @virt and @size, + * intersects with the region specified by @begin and @end, false otherwise. + */ +static inline bool memory_intersects(void *begin, void *end, void *virt, + size_t size) +{ + void *vend = virt + size; + + return (virt >= begin && virt < end) || (vend >= begin && vend < end); +} + +/** + * init_section_contains - checks if an object is contained within the init + * section + * @virt: virtual address of the memory object + * @size: size of the memory object + * + * Returns: true if the object specified by @virt and @size is entirely + * contained within the init section, false otherwise. + */ +static inline bool init_section_contains(void *virt, size_t size) +{ + return memory_contains(__init_begin, __init_end, virt, size); +} + +/** + * init_section_intersects - checks if the region occupied by an object + * intersects with the init section + * @virt: virtual address of the memory object + * @size: size of the memory object + * + * Returns: true if an object's memory region, specified by @virt and @size, + * intersects with the init section, false otherwise. + */ +static inline bool init_section_intersects(void *virt, size_t size) +{ + return memory_intersects(__init_begin, __init_end, virt, size); +} + #endif /* _ASM_GENERIC_SECTIONS_H_ */ |