From 597781f3e51f48ef8e67be772196d9e9673752c4 Mon Sep 17 00:00:00 2001 From: Cesar Eduardo Barros Date: Mon, 9 Aug 2010 17:18:32 -0700 Subject: kmap_atomic: make kunmap_atomic() harder to misuse kunmap_atomic() is currently at level -4 on Rusty's "Hard To Misuse" list[1] ("Follow common convention and you'll get it wrong"), except in some architectures when CONFIG_DEBUG_HIGHMEM is set[2][3]. kunmap() takes a pointer to a struct page; kunmap_atomic(), however, takes takes a pointer to within the page itself. This seems to once in a while trip people up (the convention they are following is the one from kunmap()). Make it much harder to misuse, by moving it to level 9 on Rusty's list[4] ("The compiler/linker won't let you get it wrong"). This is done by refusing to build if the type of its first argument is a pointer to a struct page. The real kunmap_atomic() is renamed to kunmap_atomic_notypecheck() (which is what you would call in case for some strange reason calling it with a pointer to a struct page is not incorrect in your code). The previous version of this patch was compile tested on x86-64. [1] http://ozlabs.org/~rusty/index.cgi/tech/2008-04-01.html [2] In these cases, it is at level 5, "Do it right or it will always break at runtime." [3] At least mips and powerpc look very similar, and sparc also seems to share a common ancestor with both; there seems to be quite some degree of copy-and-paste coding here. The include/asm/highmem.h file for these three archs mention x86 CPUs at its top. [4] http://ozlabs.org/~rusty/index.cgi/tech/2008-03-30.html [5] As an aside, could someone tell me why mn10300 uses unsigned long as the first parameter of kunmap_atomic() instead of void *? Signed-off-by: Cesar Eduardo Barros Cc: Russell King (arch/arm) Cc: Ralf Baechle (arch/mips) Cc: David Howells (arch/frv, arch/mn10300) Cc: Koichi Yasutake (arch/mn10300) Cc: Kyle McMartin (arch/parisc) Cc: Helge Deller (arch/parisc) Cc: "James E.J. Bottomley" (arch/parisc) Cc: Benjamin Herrenschmidt (arch/powerpc) Cc: Paul Mackerras (arch/powerpc) Cc: "David S. Miller" (arch/sparc) Cc: Thomas Gleixner (arch/x86) Cc: Ingo Molnar (arch/x86) Cc: "H. Peter Anvin" (arch/x86) Cc: Arnd Bergmann (include/asm-generic) Cc: Rusty Russell ("Hard To Misuse" list) Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/mips/include/asm/highmem.h | 4 ++-- arch/mips/mm/highmem.c | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) (limited to 'arch/mips') diff --git a/arch/mips/include/asm/highmem.h b/arch/mips/include/asm/highmem.h index 25adfb02923d..75753ca73bfd 100644 --- a/arch/mips/include/asm/highmem.h +++ b/arch/mips/include/asm/highmem.h @@ -48,14 +48,14 @@ extern void kunmap_high(struct page *page); extern void *__kmap(struct page *page); extern void __kunmap(struct page *page); extern void *__kmap_atomic(struct page *page, enum km_type type); -extern void __kunmap_atomic(void *kvaddr, enum km_type type); +extern void __kunmap_atomic_notypecheck(void *kvaddr, enum km_type type); extern void *kmap_atomic_pfn(unsigned long pfn, enum km_type type); extern struct page *__kmap_atomic_to_page(void *ptr); #define kmap __kmap #define kunmap __kunmap #define kmap_atomic __kmap_atomic -#define kunmap_atomic __kunmap_atomic +#define kunmap_atomic_notypecheck __kunmap_atomic_notypecheck #define kmap_atomic_to_page __kmap_atomic_to_page #define flush_cache_kmaps() flush_cache_all() diff --git a/arch/mips/mm/highmem.c b/arch/mips/mm/highmem.c index 127d732474bf..6a2b1bf9ef11 100644 --- a/arch/mips/mm/highmem.c +++ b/arch/mips/mm/highmem.c @@ -64,7 +64,7 @@ void *__kmap_atomic(struct page *page, enum km_type type) } EXPORT_SYMBOL(__kmap_atomic); -void __kunmap_atomic(void *kvaddr, enum km_type type) +void __kunmap_atomic_notypecheck(void *kvaddr, enum km_type type) { #ifdef CONFIG_DEBUG_HIGHMEM unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK; @@ -87,7 +87,7 @@ void __kunmap_atomic(void *kvaddr, enum km_type type) pagefault_enable(); } -EXPORT_SYMBOL(__kunmap_atomic); +EXPORT_SYMBOL(__kunmap_atomic_notypecheck); /* * This is the same as kmap_atomic() but can map memory that doesn't -- cgit v1.2.2