Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=3a6c43a78763da67d4049745ce35122734e89fbc
Commit: 3a6c43a78763da67d4049745ce35122734e89fbc
Parent: c637fecb4fe67e2baccef24b9b7e9cb79ee23cf8
Author: Atsushi Nemoto <[EMAIL PROTECTED]>
AuthorDate: Tue Oct 23 21:55:42 2007 +0900
Committer: Ralf Baechle <[EMAIL PROTECTED]>
CommitDate: Mon Oct 29 19:35:35 2007 +0000
[MIPS] time: Make c0_compare_int_usable faster
Try increasingly longer time periods starting of at 0x10 cycles. This
should be fast on hardware and work nicely with emulators.
Signed-off-by: Ralf Baechle <[EMAIL PROTECTED]>
---
arch/mips/kernel/cevt-r4k.c | 14 ++++++++++----
1 files changed, 10 insertions(+), 4 deletions(-)
diff --git a/arch/mips/kernel/cevt-r4k.c b/arch/mips/kernel/cevt-r4k.c
index 7274fd2..a59f67f 100644
--- a/arch/mips/kernel/cevt-r4k.c
+++ b/arch/mips/kernel/cevt-r4k.c
@@ -179,7 +179,7 @@ static int c0_compare_int_pending(void)
static int c0_compare_int_usable(void)
{
- const unsigned int delta = 0x300000;
+ unsigned int delta;
unsigned int cnt;
/*
@@ -192,9 +192,15 @@ static int c0_compare_int_usable(void)
return 0;
}
- cnt = read_c0_count();
- cnt += delta;
- write_c0_compare(cnt);
+ for (delta = 0x10; delta <= 0x400000; delta <<= 1) {
+ cnt = read_c0_count();
+ cnt += delta;
+ write_c0_compare(cnt);
+ irq_disable_hazard();
+ if ((int)(read_c0_count() - cnt) < 0)
+ break;
+ /* increase delta if the timer was already expired */
+ }
while ((int)(read_c0_count() - cnt) <= 0)
; /* Wait for expiry */
-
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