Commit-ID: b3fc5c9bb373661224906bf434c09ca0de032e82
Gitweb: https://git.kernel.org/tip/b3fc5c9bb373661224906bf434c09ca0de032e82
Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
AuthorDate: Thu, 15 Mar 2018 11:49:36 +0100
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 20 Mar 2018 08:23:25 +0100
sched/wait: Improve __var_waitqueue() code generation
Since we fixed hash_64() to not suck there is no need to play games to
attempt to improve the hash value on 64-bit.
Also, since we don't use the bit value for the variables, use hash_ptr()
directly.
No change in functionality.
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: George Spelvin <linux@xxxxxxxxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
kernel/sched/wait_bit.c | 7 +------
1 file changed, 1 insertion(+), 6 deletions(-)
diff --git a/kernel/sched/wait_bit.c b/kernel/sched/wait_bit.c
index 60a84f5a6cb4..c67c6d24adc2 100644
--- a/kernel/sched/wait_bit.c
+++ b/kernel/sched/wait_bit.c
@@ -151,12 +151,7 @@ EXPORT_SYMBOL(wake_up_bit);
wait_queue_head_t *__var_waitqueue(void *p)
{
- if (BITS_PER_LONG == 64) {
- unsigned long q = (unsigned long)p;
-
- return bit_waitqueue((void *)(q & ~1), q & 1);
- }
- return bit_waitqueue(p, 0);
+ return bit_wait_table + hash_ptr(p, WAIT_TABLE_BITS);
}
EXPORT_SYMBOL(__var_waitqueue);
--
To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
|