From: Masayoshi Mizuma <[email protected]> Show the warning and taints as TAINT_CPU_OUT_OF_SPEC if the cache line size is greater than the maximum.
Signed-off-by: Masayoshi Mizuma <[email protected]> Reviewed-by: Hidetoshi Seto <[email protected]> Tested-by: Zhang Lei <[email protected]> --- arch/arm64/include/asm/cache.h | 2 ++ arch/arm64/mm/init.c | 5 +++++ 2 files changed, 7 insertions(+) diff --git a/arch/arm64/include/asm/cache.h b/arch/arm64/include/asm/cache.h index 926434f413fa..636e277fefc9 100644 --- a/arch/arm64/include/asm/cache.h +++ b/arch/arm64/include/asm/cache.h @@ -91,6 +91,8 @@ static inline u32 cache_type_cwg(void) #define __read_mostly __attribute__((__section__(".data..read_mostly"))) +#define ARM64_MAX_CACHE_LINE_SIZE 2048 + static inline int cache_line_size(void) { u32 cwg = cache_type_cwg(); diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index d2adffb81b5d..df621d90b19c 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -562,6 +562,11 @@ void __init mem_init(void) */ sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; } + + WARN_TAINT(cache_line_size() > ARM64_MAX_CACHE_LINE_SIZE, + TAINT_CPU_OUT_OF_SPEC, + "CTR_EL0.CWG is greater than the spec (%d > %d)", + cache_line_size(), ARM64_MAX_CACHE_LINE_SIZE); } void free_initmem(void) -- 2.20.1
