diff options
| author | William Lee Irwin III <wli@holomorphy.com> | 2004-10-18 18:00:05 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2004-10-18 18:00:05 -0700 |
| commit | 525b64cdbd0401b8d3cb5642159e5ec8e49290b7 (patch) | |
| tree | f0cebde6bef06fdc099fad682c7e650482122804 /kernel | |
| parent | baa896b3ded47a7f6a401267f5995dcc09d5d5d4 (diff) | |
[PATCH] eliminate bh waitqueue hashtable
Eliminate the bh waitqueue hashtable using bit_waitqueue() via
wait_on_bit() and wake_up_bit() to locate the waitqueue head associated
with a bit.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/wait.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/wait.c b/kernel/wait.c index 29057f707dbd..e87ae721643c 100644 --- a/kernel/wait.c +++ b/kernel/wait.c @@ -8,6 +8,7 @@ #include <linux/module.h> #include <linux/sched.h> #include <linux/wait.h> +#include <linux/hash.h> void fastcall add_wait_queue(wait_queue_head_t *q, wait_queue_t *wait) { @@ -187,3 +188,13 @@ void fastcall __wake_up_bit(wait_queue_head_t *wq, void *word, int bit) __wake_up(wq, TASK_INTERRUPTIBLE|TASK_UNINTERRUPTIBLE, 1, &key); } EXPORT_SYMBOL(__wake_up_bit); + +fastcall wait_queue_head_t *bit_waitqueue(void *word, int bit) +{ + const int shift = BITS_PER_LONG == 32 ? 5 : 6; + const struct zone *zone = page_zone(virt_to_page(word)); + unsigned long val = (unsigned long)word << shift | bit; + + return &zone->wait_table[hash_long(val, zone->wait_table_bits)]; +} +EXPORT_SYMBOL(bit_waitqueue); |