4.4-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit 3694bd76781b76c4f8d2ecd85018feeb1609f0e5 ]
Currently __set_fixmap_offset is a macro function which has a local variable called 'addr'. If a caller passes a 'phys' parameter which is derived from a variable also called 'addr', the local variable will shadow this, and the compiler will complain about the use of an uninitialized variable. To avoid the issue with namespace clashes, 'addr' is prefixed with a liberal sprinkling of underscores.
Turning __set_fixmap_offset into a static inline breaks the build for several architectures. Fixing this properly requires updates to a number of architectures to make them agree on the prototype of __set_fixmap (it could be done as a subsequent patch series).
Signed-off-by: Mark Rutland mark.rutland@arm.com Cc: Arnd Bergmann arnd@arndb.de [catalin.marinas@arm.com: squashed the original function patch and macro fixup] Signed-off-by: Catalin Marinas catalin.marinas@arm.com Signed-off-by: Sasha Levin sashal@kernel.org --- include/asm-generic/fixmap.h | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/include/asm-generic/fixmap.h b/include/asm-generic/fixmap.h index 1cbb8338edf3..827e4d3bbc7a 100644 --- a/include/asm-generic/fixmap.h +++ b/include/asm-generic/fixmap.h @@ -70,12 +70,12 @@ static inline unsigned long virt_to_fix(const unsigned long vaddr) #endif
/* Return a pointer with offset calculated */ -#define __set_fixmap_offset(idx, phys, flags) \ -({ \ - unsigned long addr; \ - __set_fixmap(idx, phys, flags); \ - addr = fix_to_virt(idx) + ((phys) & (PAGE_SIZE - 1)); \ - addr; \ +#define __set_fixmap_offset(idx, phys, flags) \ +({ \ + unsigned long ________addr; \ + __set_fixmap(idx, phys, flags); \ + ________addr = fix_to_virt(idx) + ((phys) & (PAGE_SIZE - 1)); \ + ________addr; \ })
#define set_fixmap_offset(idx, phys) \