diff options
| author | John David Anglin <dave.anglin@bell.net> | 2013-05-07 02:07:25 +0200 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2013-05-07 20:33:03 +0200 |
| commit | c207a76bf155cb5cf24cf849c08f6555e9180594 (patch) | |
| tree | f9f05b4d721dd215e28318337617beada3c238dd /arch/parisc | |
| parent | parisc: implement atomic64_dec_if_positive() (diff) | |
| download | linux-c207a76bf155cb5cf24cf849c08f6555e9180594.tar.xz linux-c207a76bf155cb5cf24cf849c08f6555e9180594.zip | |
parisc: only re-enable interrupts if we need to schedule or deliver signals when returning to userspace
Helge and I have found that we have a kernel stack overflow problem
which causes a variety of random failures.
Currently, we re-enable interrupts when returning from an external
interrupt incase we need to schedule or delivery
signals. As a result, a potentially unlimited number of interrupts
can occur while we are running on the kernel
stack. It is very limited in space (currently, 16k). This change
defers enabling interrupts until we have
actually decided to schedule or delivery signals. This only occurs
when we about to return to userspace. This
limits the number of interrupts on the kernel stack to one. In other
cases, interrupts remain disabled until the
final return from interrupt (rfi).
Signed-off-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'arch/parisc')
| -rw-r--r-- | arch/parisc/kernel/entry.S | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/arch/parisc/kernel/entry.S b/arch/parisc/kernel/entry.S index 36f4f1dcb778..3f3326d876f7 100644 --- a/arch/parisc/kernel/entry.S +++ b/arch/parisc/kernel/entry.S @@ -833,11 +833,6 @@ ENTRY(syscall_exit_rfi) STREG %r19,PT_SR7(%r16) intr_return: - /* NOTE: Need to enable interrupts incase we schedule. */ - ssm PSW_SM_I, %r0 - -intr_check_resched: - /* check for reschedule */ mfctl %cr30,%r1 LDREG TI_FLAGS(%r1),%r19 /* sched.h: TIF_NEED_RESCHED */ @@ -864,6 +859,11 @@ intr_check_sig: LDREG PT_IASQ1(%r16), %r20 cmpib,COND(=),n 0,%r20,intr_restore /* backward */ + /* NOTE: We need to enable interrupts if we have to deliver + * signals. We used to do this earlier but it caused kernel + * stack overflows. */ + ssm PSW_SM_I, %r0 + copy %r0, %r25 /* long in_syscall = 0 */ #ifdef CONFIG_64BIT ldo -16(%r30),%r29 /* Reference param save area */ @@ -915,6 +915,10 @@ intr_do_resched: cmpib,COND(=) 0, %r20, intr_do_preempt nop + /* NOTE: We need to enable interrupts if we schedule. We used + * to do this earlier but it caused kernel stack overflows. */ + ssm PSW_SM_I, %r0 + #ifdef CONFIG_64BIT ldo -16(%r30),%r29 /* Reference param save area */ #endif |