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authorNick Piggin <nickpiggin@yahoo.com.au>2005-06-25 17:57:23 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-25 19:24:43 -0400
commit4866cde064afbb6c2a488c265e696879de616daa (patch)
tree6effad1ab6271129fc607b98273086409876563a /include/asm-mips
parent48c08d3f8ff94fa118187e4d8d4a5707bb85e59d (diff)
[PATCH] sched: cleanup context switch locking
Instead of requiring architecture code to interact with the scheduler's locking implementation, provide a couple of defines that can be used by the architecture to request runqueue unlocked context switches, and ask for interrupts to be enabled over the context switch. Also replaces the "switch_lock" used by these architectures with an oncpu flag (note, not a potentially slow bitflag). This eliminates one bus locked memory operation when context switching, and simplifies the task_running function. Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-mips')
-rw-r--r--include/asm-mips/system.h10
1 files changed, 2 insertions, 8 deletions
diff --git a/include/asm-mips/system.h b/include/asm-mips/system.h
index 888fd8908467..169f3d4265b1 100644
--- a/include/asm-mips/system.h
+++ b/include/asm-mips/system.h
@@ -422,16 +422,10 @@ extern void __die_if_kernel(const char *, struct pt_regs *, const char *file,
422extern int stop_a_enabled; 422extern int stop_a_enabled;
423 423
424/* 424/*
425 * Taken from include/asm-ia64/system.h; prevents deadlock on SMP 425 * See include/asm-ia64/system.h; prevents deadlock on SMP
426 * systems. 426 * systems.
427 */ 427 */
428#define prepare_arch_switch(rq, next) \ 428#define __ARCH_WANT_UNLOCKED_CTXSW
429do { \
430 spin_lock(&(next)->switch_lock); \
431 spin_unlock(&(rq)->lock); \
432} while (0)
433#define finish_arch_switch(rq, prev) spin_unlock_irq(&(prev)->switch_lock)
434#define task_running(rq, p) ((rq)->curr == (p) || spin_is_locked(&(p)->switch_lock))
435 429
436#define arch_align_stack(x) (x) 430#define arch_align_stack(x) (x)
437 431