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authorNick Piggin <nickpiggin@yahoo.com.au>2005-06-25 14:57:23 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-25 16:24:43 -0700
commit4866cde064afbb6c2a488c265e696879de616daa (patch)
tree6effad1ab6271129fc607b98273086409876563a /include/asm-sparc/system.h
parent48c08d3f8ff94fa118187e4d8d4a5707bb85e59d (diff)
downloadblackbird-op-linux-4866cde064afbb6c2a488c265e696879de616daa.tar.gz
blackbird-op-linux-4866cde064afbb6c2a488c265e696879de616daa.zip
[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-sparc/system.h')
-rw-r--r--include/asm-sparc/system.h4
1 files changed, 1 insertions, 3 deletions
diff --git a/include/asm-sparc/system.h b/include/asm-sparc/system.h
index 80cf20cfaee1..898562ebe94c 100644
--- a/include/asm-sparc/system.h
+++ b/include/asm-sparc/system.h
@@ -101,7 +101,7 @@ extern void fpsave(unsigned long *fpregs, unsigned long *fsr,
* SWITCH_ENTER and SWITH_DO_LAZY_FPU do not work yet (e.g. SMP does not work)
* XXX WTF is the above comment? Found in late teen 2.4.x.
*/
-#define prepare_arch_switch(rq, next) do { \
+#define prepare_arch_switch(next) do { \
__asm__ __volatile__( \
".globl\tflush_patch_switch\nflush_patch_switch:\n\t" \
"save %sp, -0x40, %sp; save %sp, -0x40, %sp; save %sp, -0x40, %sp\n\t" \
@@ -109,8 +109,6 @@ extern void fpsave(unsigned long *fpregs, unsigned long *fsr,
"save %sp, -0x40, %sp\n\t" \
"restore; restore; restore; restore; restore; restore; restore"); \
} while(0)
-#define finish_arch_switch(rq, next) spin_unlock_irq(&(rq)->lock)
-#define task_running(rq, p) ((rq)->curr == (p))
/* Much care has gone into this code, do not touch it.
*
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