| commit | 8fd45ca90f129fd7318a8914a33e998a3a60b031 | |
| author | Atsushi Nemoto <anemo@mba.ocn.ne.jp> | |
| Wed, 7 Jun 2006 16:09:01 +0000 (8 01:09 +0900) | ||
| committer | Ralf Baechle <ralf@linux-mips.org> | |
| Sun, 10 Sep 2006 00:06:22 +0000 (10 02:06 +0200) | ||
| tree | 19cd63fb4326e3b08b784ad8c6eba8a2d0b80a15 | treesnapshot (tar.gz zip) |
| parent | 39823c1e4622cde51a7373bb32be1ccbc3feaead | commitdiff |
[MIPS] Reduce race between cpu_wait() and need_resched() checking
If a thread became runnable between need_resched() and the WAIT
instruction, switching to the thread will delay until a next interrupt.
Some CPUs can execute the WAIT instruction with interrupt disabled, so
we can get rid of this race on them (at least UP case).
Original Patch by Atsushi with fixing up for MIPS Technology's cores by
Ralf based on feedback from the RTL designers.
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
If a thread became runnable between need_resched() and the WAIT
instruction, switching to the thread will delay until a next interrupt.
Some CPUs can execute the WAIT instruction with interrupt disabled, so
we can get rid of this race on them (at least UP case).
Original Patch by Atsushi with fixing up for MIPS Technology's cores by
Ralf based on feedback from the RTL designers.
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
| arch/mips/kernel/cpu-probe.c | diffblobblamehistory |