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nexedi
linux
Commits
5acf5ff0
Commit
5acf5ff0
authored
May 27, 2003
by
Paul Mackerras
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PPC32: Fix preempt bugs identified by Milton Miller.
parent
8a865f4a
Changes
1
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1 changed file
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6 additions
and
3 deletions
+6
-3
arch/ppc/kernel/entry.S
arch/ppc/kernel/entry.S
+6
-3
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arch/ppc/kernel/entry.S
View file @
5acf5ff0
...
...
@@ -507,7 +507,7 @@ ret_from_except:
MTMSRD
(
r10
)
/*
disable
interrupts
*/
lwz
r3
,
_MSR
(
r1
)
/*
Returning
to
user
mode
?
*/
andi
.
r
3
,
r3
,
MSR_PR
andi
.
r
0
,
r3
,
MSR_PR
beq
resume_kernel
user_exc_return
:
/
*
r10
contains
MSR_KERNEL
here
*/
...
...
@@ -528,6 +528,7 @@ restore_user:
#ifdef CONFIG_PREEMPT
b
restore
/*
N.B
.
the
only
way
to
get
here
is
from
the
beq
following
ret_from_except
.
*/
resume_kernel
:
/
*
check
current_thread_info
->
preempt_count
*/
rlwinm
r9
,
r1
,
0
,
0
,
18
...
...
@@ -549,8 +550,10 @@ resume_kernel:
SYNC
MTMSRD
(
r10
)
/*
disable
interrupts
*/
rlwinm
r9
,
r1
,
0
,
0
,
18
lwz
r0
,
TI_FLAGS
(
r9
)
andi
.
r0
,
r0
,
_TIF_NEED_RESCHED
li
r0
,
0
stw
r0
,
TI_PREEMPT
(
r9
)
lwz
r3
,
TI_FLAGS
(
r9
)
andi
.
r0
,
r3
,
_TIF_NEED_RESCHED
bne
-
1
b
#else
resume_kernel
:
...
...
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