From abb29c3bb13c7b747fae18b9c63b660529ccc612 Mon Sep 17 00:00:00 2001 From: Kevin Hao Date: Tue, 6 Aug 2013 18:23:30 +0800 Subject: [PATCH] powerpc: Move the testing of CPU_FTR_COHERENT_ICACHE into __flush_icache_range In function flush_icache_range(), we use cpu_has_feature() to test the feature bit of CPU_FTR_COHERENT_ICACHE. But this seems not optimal for two reasons: a) For ppc32, the function __flush_icache_range() already do this check with the macro END_FTR_SECTION_IFSET. b) Compare with the cpu_has_feature(), the method of using macro END_FTR_SECTION_IFSET will not introduce any runtime overhead. [And while at it, add the missing required isync] -- BenH Signed-off-by: Kevin Hao Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/include/asm/cacheflush.h | 3 +-- arch/powerpc/kernel/misc_32.S | 1 + arch/powerpc/kernel/misc_64.S | 4 +++- 3 files changed, 5 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/include/asm/cacheflush.h b/arch/powerpc/include/asm/cacheflush.h index b843e35122e8..60b620d64ac9 100644 --- a/arch/powerpc/include/asm/cacheflush.h +++ b/arch/powerpc/include/asm/cacheflush.h @@ -35,8 +35,7 @@ extern void __flush_disable_L1(void); extern void __flush_icache_range(unsigned long, unsigned long); static inline void flush_icache_range(unsigned long start, unsigned long stop) { - if (!cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) - __flush_icache_range(start, stop); + __flush_icache_range(start, stop); } extern void flush_icache_user_range(struct vm_area_struct *vma, diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S index e469f30e6eeb..1722a2be66ca 100644 --- a/arch/powerpc/kernel/misc_32.S +++ b/arch/powerpc/kernel/misc_32.S @@ -329,6 +329,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_UNIFIED_ID_CACHE) */ _KPROBE(__flush_icache_range) BEGIN_FTR_SECTION + isync blr /* for 601, do nothing */ END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE) li r5,L1_CACHE_BYTES-1 diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S index 6820e45f557b..74d87f117566 100644 --- a/arch/powerpc/kernel/misc_64.S +++ b/arch/powerpc/kernel/misc_64.S @@ -68,7 +68,9 @@ PPC64_CACHES: */ _KPROBE(__flush_icache_range) - +BEGIN_FTR_SECTION + blr +END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE) /* * Flush the data cache to memory * -- 2.20.1