On 9/30/24 11:13 AM, Kanchan Joshi wrote:
diff --git a/include/linux/rw_hint.h b/include/linux/rw_hint.h index 309ca72f2dfb..f4373a71ffed 100644 --- a/include/linux/rw_hint.h +++ b/include/linux/rw_hint.h @@ -21,4 +21,28 @@ enum rw_hint { static_assert(sizeof(enum rw_hint) == 1); #endif+#define WRITE_LIFE_INVALID (RWH_WRITE_LIFE_EXTREME + 1)+ +static inline bool rw_hint_valid(u64 hint) +{ + BUILD_BUG_ON(WRITE_LIFE_NOT_SET != RWH_WRITE_LIFE_NOT_SET); + BUILD_BUG_ON(WRITE_LIFE_NONE != RWH_WRITE_LIFE_NONE); + BUILD_BUG_ON(WRITE_LIFE_SHORT != RWH_WRITE_LIFE_SHORT); + BUILD_BUG_ON(WRITE_LIFE_MEDIUM != RWH_WRITE_LIFE_MEDIUM); + BUILD_BUG_ON(WRITE_LIFE_LONG != RWH_WRITE_LIFE_LONG); + BUILD_BUG_ON(WRITE_LIFE_EXTREME != RWH_WRITE_LIFE_EXTREME); + + switch (hint) { + case RWH_WRITE_LIFE_NOT_SET: + case RWH_WRITE_LIFE_NONE: + case RWH_WRITE_LIFE_SHORT: + case RWH_WRITE_LIFE_MEDIUM: + case RWH_WRITE_LIFE_LONG: + case RWH_WRITE_LIFE_EXTREME: + return true; + default: + return false; + } +}
Moving a function that is not in the hot path from a .c file to a .h file is wrong. This increases the kernel size, slows down compilation and makes implementation details visible to callers that should not have access to these implementation details. Bart.
