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| author | Carmelo Amoroso <carmelo.amoroso@st.com> | 2008-09-05 07:42:16 +0200 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2008-09-05 07:42:16 +0200 |
| commit | 323b8c410a2453f15578c22b0eef50456359bbfc (patch) | |
| tree | da216c011548831a3448da414732e94de81a6c43 /arch/sh/kernel/entry-common.S | |
| parent | sh: fix semtimedop syscall (diff) | |
| download | linux-323b8c410a2453f15578c22b0eef50456359bbfc.tar.xz linux-323b8c410a2453f15578c22b0eef50456359bbfc.zip | |
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>
Diffstat (limited to 'arch/sh/kernel/entry-common.S')
| -rw-r--r-- | arch/sh/kernel/entry-common.S | 27 |
1 files changed, 3 insertions, 24 deletions
diff --git a/arch/sh/kernel/entry-common.S b/arch/sh/kernel/entry-common.S index 0bc17def55a7..efbb4268875e 100644 --- a/arch/sh/kernel/entry-common.S +++ b/arch/sh/kernel/entry-common.S @@ -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 - 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 + jsr @r0 ! call preempt_schedule_irq 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) |