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sh: resume_kernel fix for kernel oops built with CONFIG_BKL_PREEMPT=y. 

This patch fixes a problem within the SH implementation of resume_kernel code,
that implements in assembly the bulk of preempt_schedule_irq function without
taking care of the extra code needed to handle the BKL preemptible.

The patch basically consists of removing this asm code and calling the common
C implementation (see kernel/sched.c) as other archs do.

Another change is the missing 'cli' macro invocation at the beginning of
the resume_kernel.

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Carmelo Amoroso 2008-09-05 14:42:16 +09:00 committed by Paul Mundt
parent 3c31bf7313
commit 323b8c410a
1 changed files with 3 additions and 24 deletions
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27
arch/sh/kernel/entry-common.S
View File

@ -92,6 +92,7 @@ ENTRY(ret_from_irq)
bra resume_userspace
nop
ENTRY(resume_kernel)
cli
mov.l @(TI_PRE_COUNT,r8), r0 ! current_thread_info->preempt_count
tst r0, r0
bf noresched
@ -105,28 +106,9 @@ need_resched:
and #0xf0, r0 ! interrupts off (exception path)?
cmp/eq #0xf0, r0
bt noresched
mov.l 1f, r0
mov.l r0, @(TI_PRE_COUNT,r8)
#ifdef CONFIG_TRACE_IRQFLAGS
mov.l 3f, r0
jsr @r0
jsr @r0 ! call preempt_schedule_irq
nop
#endif
sti
mov.l 2f, r0
jsr @r0
nop
mov #0, r0
mov.l r0, @(TI_PRE_COUNT,r8)
cli
#ifdef CONFIG_TRACE_IRQFLAGS
mov.l 4f, r0
jsr @r0
nop
#endif
bra need_resched
nop
@ -137,10 +119,7 @@ noresched:
.align 2
1: .long PREEMPT_ACTIVE
2: .long schedule
#ifdef CONFIG_TRACE_IRQFLAGS
3: .long trace_hardirqs_on
4: .long trace_hardirqs_off
#endif
3: .long preempt_schedule_irq
#endif
ENTRY(resume_userspace)