Commit 5c38602d authored by Helge Deller's avatar Helge Deller

parisc: Re-enable interrupts early

Since kernel 3.9 we re-enable interrupts quite late due to commit c207a76b
("parisc: only re-enable interrupts if we need to schedule or deliver signals
when returning to userspace"). At that time the parisc kernel had no dedicated
IRQ stack, and this commit prevented kernel stack overflows.

But since commit 200c8804 ("parisc: implement irq stacks") we now have an
IRQ stack, so we may be safe now.  And when CONFIG_DEBUG_STACKOVERFLOW=y is
enabled, we can even check at runtime for overflows.
Signed-off-by: default avatarHelge Deller <deller@gmx.de>
parent 18d98a79
......@@ -878,6 +878,9 @@ ENTRY_CFI(syscall_exit_rfi)
STREG %r19,PT_SR7(%r16)
intr_return:
/* NOTE: Need to enable interrupts incase we schedule. */
ssm PSW_SM_I, %r0
/* check for reschedule */
mfctl %cr30,%r1
LDREG TI_FLAGS(%r1),%r19 /* sched.h: TIF_NEED_RESCHED */
......@@ -904,11 +907,6 @@ 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 */
......@@ -960,10 +958,6 @@ 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
......
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