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[PATCH] lockdep: irqtrace subsystem, move account_system_vtime() calls into kernel/softirq.c

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At the moment, powerpc and s390 have their own versions of do_softirq which
include local_bh_disable() and __local_bh_enable() calls.  They end up
calling __do_softirq (in kernel/softirq.c) which also does
local_bh_disable/enable.

Apparently the two levels of disable/enable trigger a warning from some
validation code that Ingo is working on, and he would like to see the outer
level removed.  But to do that, we have to move the account_system_vtime
calls that are currently in the arch do_softirq() implementations for
powerpc and s390 into the generic __do_softirq() (this is a no-op for other
archs because account_system_vtime is defined to be an empty inline
function on all other archs).  This patch does that.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Paul Mackerras 2006-07-03 00:25:40 -07:00 committed by Linus Torvalds
parent 8688cfcebf
commit 829035fd70
3 changed files with 5 additions and 14 deletions
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7
arch/powerpc/kernel/irq.c
View file

@ -424,13 +424,8 @@ void do_softirq(void)
local_irq_save(flags);
if (local_softirq_pending()) {
account_system_vtime(current);
local_bh_disable();
if (local_softirq_pending())
do_softirq_onstack();
account_system_vtime(current);
_local_bh_enable();
}
local_irq_restore(flags);
}

8
arch/s390/kernel/irq.c
View file

@ -69,10 +69,6 @@ asmlinkage void do_softirq(void)
local_irq_save(flags);
account_system_vtime(current);
local_bh_disable();
if (local_softirq_pending()) {
/* Get current stack pointer. */
asm volatile("la %0,0(15)" : "=a" (old));
@ -95,10 +91,6 @@ asmlinkage void do_softirq(void)
__do_softirq();
}
account_system_vtime(current);
_local_bh_enable();
local_irq_restore(flags);
}

4
kernel/softirq.c
View file

@ -193,6 +193,8 @@ asmlinkage void __do_softirq(void)
int cpu;
pending = local_softirq_pending();
account_system_vtime(current);
__local_bh_disable((unsigned long)__builtin_return_address(0));
trace_softirq_enter();
@ -224,6 +226,8 @@ restart:
wakeup_softirqd();
trace_softirq_exit();
account_system_vtime(current);
_local_bh_enable();
}