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| author | Christophe Leroy | 2019-05-10 11:24:48 +0200 |
|---|---|---|
| committer | Michael Ellerman | 2019-07-04 17:35:10 +0200 |
| commit | 6c5875843b87c3adea2beade9d1b8b3d4523900a (patch) | |
| tree | 3654d6521c3ba3692ad8e73abd3b05b519dd1527 /arch/powerpc/include | |
| parent | powerpc/mm/hugetlb: Don't enable HugeTLB if we don't have a page table cache (diff) | |
| download | kernel-qcow2-linux-6c5875843b87c3adea2beade9d1b8b3d4523900a.tar.gz kernel-qcow2-linux-6c5875843b87c3adea2beade9d1b8b3d4523900a.tar.xz kernel-qcow2-linux-6c5875843b87c3adea2beade9d1b8b3d4523900a.zip | |
powerpc: slightly improve cache helpers
Cache instructions (dcbz, dcbi, dcbf and dcbst) take two registers
that are summed to obtain the target address. Using 'Z' constraint
and '%y0' argument gives GCC the opportunity to use both registers
instead of only one with the second being forced to 0.
Suggested-by: Segher Boessenkool <segher@kernel.crashing.org>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include')
| -rw-r--r-- | arch/powerpc/include/asm/cache.h | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/powerpc/include/asm/cache.h b/arch/powerpc/include/asm/cache.h index 40ea5b3781c6..df8e4c407366 100644 --- a/arch/powerpc/include/asm/cache.h +++ b/arch/powerpc/include/asm/cache.h @@ -85,22 +85,22 @@ extern void _set_L3CR(unsigned long); static inline void dcbz(void *addr) { - __asm__ __volatile__ ("dcbz 0, %0" : : "r"(addr) : "memory"); + __asm__ __volatile__ ("dcbz %y0" : : "Z"(*(u8 *)addr) : "memory"); } static inline void dcbi(void *addr) { - __asm__ __volatile__ ("dcbi 0, %0" : : "r"(addr) : "memory"); + __asm__ __volatile__ ("dcbi %y0" : : "Z"(*(u8 *)addr) : "memory"); } static inline void dcbf(void *addr) { - __asm__ __volatile__ ("dcbf 0, %0" : : "r"(addr) : "memory"); + __asm__ __volatile__ ("dcbf %y0" : : "Z"(*(u8 *)addr) : "memory"); } static inline void dcbst(void *addr) { - __asm__ __volatile__ ("dcbst 0, %0" : : "r"(addr) : "memory"); + __asm__ __volatile__ ("dcbst %y0" : : "Z"(*(u8 *)addr) : "memory"); } #endif /* !__ASSEMBLY__ */ #endif /* __KERNEL__ */ |