diff options
| author | Magnus Damm <damm@opensource.se> | 2009-10-16 14:38:48 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2009-10-16 14:38:48 +0900 |
| commit | 5fb80ae8bd7549034845ebfba694d483070b768b (patch) | |
| tree | 9657db9a4c7ad10b90d51dd22851f594f9e2d9f6 /arch/sh | |
| parent | a7a7c0e1d12bcfb4a96cae439951232b08c91841 (diff) | |
| download | lwn-5fb80ae8bd7549034845ebfba694d483070b768b.tar.gz lwn-5fb80ae8bd7549034845ebfba694d483070b768b.zip | |
sh: disabled cache handling fix.
Add code to handle the cache disabled case. Fixes breakage introduced by
37443ef3f0406e855e169c87ae3f4ffb4b6ff635 ("sh: Migrate SH-4 cacheflush
ops to function pointers."). Without this patch configuring caches off
with CONFIG_CACHE_OFF=y makes kfr2r09 and migo-r lock up in fbdev
deferred io or early user space.
Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh')
| -rw-r--r-- | arch/sh/mm/cache.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/sh/mm/cache.c b/arch/sh/mm/cache.c index 5e1091be9dc4..a2dc7f9ecc51 100644 --- a/arch/sh/mm/cache.c +++ b/arch/sh/mm/cache.c @@ -265,6 +265,8 @@ static void __init emit_cache_params(void) void __init cpu_cache_init(void) { + unsigned int cache_disabled = !(__raw_readl(CCR) & CCR_CACHE_ENABLE); + compute_alias(&boot_cpu_data.icache); compute_alias(&boot_cpu_data.dcache); compute_alias(&boot_cpu_data.scache); @@ -273,6 +275,13 @@ void __init cpu_cache_init(void) __flush_purge_region = noop__flush_region; __flush_invalidate_region = noop__flush_region; + /* + * No flushing is necessary in the disabled cache case so we can + * just keep the noop functions in local_flush_..() and __flush_..() + */ + if (unlikely(cache_disabled)) + goto skip; + if (boot_cpu_data.family == CPU_FAMILY_SH2) { extern void __weak sh2_cache_init(void); @@ -312,5 +321,6 @@ void __init cpu_cache_init(void) sh5_cache_init(); } +skip: emit_cache_params(); } |