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| author | Mathieu Malaterre <malat@debian.org> | 2018-03-07 21:34:35 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-03-13 15:50:41 +1100 |
| commit | 603b892200e653dd7e86a0e4a315561534d97441 (patch) | |
| tree | 11be6d7b2f7a58b0d71a61ba31cecdbfa48580a7 /arch/powerpc/include/asm | |
| parent | 4f1f40f7b2b4487f582ecafec64076e430c72b22 (diff) | |
| download | linux-603b892200e653dd7e86a0e4a315561534d97441.tar.bz2 | |
powerpc: Avoid comparison of unsigned long >= 0 in pfn_valid()
Rewrite comparison since all values compared are of type `unsigned long`.
Instead of using unsigned properties and rewriting the original code as:
(originally suggested by Segher Boessenkool <segher@kernel.crashing.org>)
#define pfn_valid(pfn) \
(((pfn) - ARCH_PFN_OFFSET) < (max_mapnr - ARCH_PFN_OFFSET))
Prefer a static inline function to make code as readable as possible.
Fix a warning (treated as error in W=1):
arch/powerpc/include/asm/page.h:129:32: error: comparison of unsigned expression >= 0 is always true [-Werror=type-limits]
#define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr)
^
Suggested-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Mathieu Malaterre <malat@debian.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm')
| -rw-r--r-- | arch/powerpc/include/asm/page.h | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h index d5f1c41b7dba..dec9ce5ba8af 100644 --- a/arch/powerpc/include/asm/page.h +++ b/arch/powerpc/include/asm/page.h @@ -126,7 +126,15 @@ extern long long virt_phys_offset; #ifdef CONFIG_FLATMEM #define ARCH_PFN_OFFSET ((unsigned long)(MEMORY_START >> PAGE_SHIFT)) -#define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr) +#ifndef __ASSEMBLY__ +extern unsigned long max_mapnr; +static inline bool pfn_valid(unsigned long pfn) +{ + unsigned long min_pfn = ARCH_PFN_OFFSET; + + return pfn >= min_pfn && pfn < max_mapnr; +} +#endif #endif #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT) |