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| author |   Kevin Hao <haokexin@gmail.com> | 2013-08-06 18:23:30 +0800 |
|---|---|---|
| committer |   Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-08-14 14:56:06 +1000 |
| commit | abb29c3bb13c7b747fae18b9c63b660529ccc612 (patch) | |
| tree | 7db47abfcb4fd1ed18fc8942aeffed6ce176e0e5 /arch | |
| parent | powerpc: Stop using non-architected shared_proc field in lppaca (diff) | |
| download | linux-dev-abb29c3bb13c7b747fae18b9c63b660529ccc612.tar.xz linux-dev-abb29c3bb13c7b747fae18b9c63b660529ccc612.zip | |
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 <haokexin@gmail.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/include/asm/cacheflush.h | 3 | ||||
| -rw-r--r-- | arch/powerpc/kernel/misc_32.S | 1 | ||||
| -rw-r--r-- | 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 * |