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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-s390/system.h
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-s390/system.h')
-rw-r--r--include/asm-s390/system.h17
1 files changed, 3 insertions, 14 deletions
diff --git a/include/asm-s390/system.h b/include/asm-s390/system.h
index e3cb3ce1d24..b4a9f05a93d 100644
--- a/include/asm-s390/system.h
+++ b/include/asm-s390/system.h
@@ -104,29 +104,18 @@ static inline void restore_access_regs(unsigned int *acrs)
prev = __switch_to(prev,next); \
} while (0)
-#define prepare_arch_switch(rq, next) do { } while(0)
-#define task_running(rq, p) ((rq)->curr == (p))
-
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
extern void account_user_vtime(struct task_struct *);
extern void account_system_vtime(struct task_struct *);
-
-#define finish_arch_switch(rq, prev) do { \
- set_fs(current->thread.mm_segment); \
- spin_unlock(&(rq)->lock); \
- account_system_vtime(prev); \
- local_irq_enable(); \
-} while (0)
-
#else
+#define account_system_vtime(prev) do { } while (0)
+#endif
#define finish_arch_switch(rq, prev) do { \
set_fs(current->thread.mm_segment); \
- spin_unlock_irq(&(rq)->lock); \
+ account_system_vtime(prev); \
} while (0)
-#endif
-
#define nop() __asm__ __volatile__ ("nop")
#define xchg(ptr,x) \