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| author | Dmitriy Zavin <dmitriyz@google.com> | 2006-09-26 12:52:42 +0400 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2006-09-26 12:52:42 +0400 |
| commit | 3b171672831b9633c2ed8fa94805255cd4d5af19 (patch) | |
| tree | 42b64b8f45166e58347f32b4e0d381c888981542 /include/linux/jiffies.h | |
| parent | b89ebd0b0a65d5371aa9ad98e873c4616056ca68 (diff) | |
| download | linux-3b171672831b9633c2ed8fa94805255cd4d5af19.tar.xz | |
[PATCH] Add 64bit jiffies compares (for use with get_jiffies_64)
The current time_before/time_after macros will fail typechecks
when passed u64 values (as returned by get_jiffies_64()). On 64bit
systems, this will just result in a warning about mismatching types
without explicit casts, but since unsigned long and u64
(unsigned long long) are of same size, it will still work.
On 32bit systems, a long is 32bits, so the value from get_jiffies_64()
will be truncated by the cast and thus lose all the precision gained by
64bit jiffies.
Signed-off-by: Dmitriy Zavin <dmitriyz@google.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'include/linux/jiffies.h')
| -rw-r--r-- | include/linux/jiffies.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/jiffies.h b/include/linux/jiffies.h index 329ebcffa106..c8d5f207c3d4 100644 --- a/include/linux/jiffies.h +++ b/include/linux/jiffies.h @@ -115,6 +115,21 @@ static inline u64 get_jiffies_64(void) ((long)(a) - (long)(b) >= 0)) #define time_before_eq(a,b) time_after_eq(b,a) +/* Same as above, but does so with platform independent 64bit types. + * These must be used when utilizing jiffies_64 (i.e. return value of + * get_jiffies_64() */ +#define time_after64(a,b) \ + (typecheck(__u64, a) && \ + typecheck(__u64, b) && \ + ((__s64)(b) - (__s64)(a) < 0)) +#define time_before64(a,b) time_after64(b,a) + +#define time_after_eq64(a,b) \ + (typecheck(__u64, a) && \ + typecheck(__u64, b) && \ + ((__s64)(a) - (__s64)(b) >= 0)) +#define time_before_eq64(a,b) time_after_eq64(b,a) + /* * Have the 32 bit jiffies value wrap 5 minutes after boot * so jiffies wrap bugs show up earlier. |