aboutsummaryrefslogtreecommitdiff
path: root/arch/sparc64/kernel/winfixup.S
diff options
context:
space:
mode:
authorDavid S. Miller <davem@davemloft.net>2006-01-31 18:34:51 -0800
committerDavid S. Miller <davem@sunset.davemloft.net>2006-03-20 01:11:29 -0800
commit86b818687d4894063ecd1190e54717a0cce8c009 (patch)
treed2951295358502c88f7fe0c02517d729cff4eb9a /arch/sparc64/kernel/winfixup.S
parent9954863975910a1b9372b7d5006a6cba43bdd288 (diff)
[SPARC64]: Fix race in LOAD_PER_CPU_BASE()
Since we use %g5 itself as a temporary, it can get clobbered if we take an interrupt mid-stream and thus cause end up with the final %g5 value too early as a result of rtrap processing. Set %g5 at the very end, atomically, to avoid this problem. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc64/kernel/winfixup.S')
-rw-r--r--arch/sparc64/kernel/winfixup.S6
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/sparc64/kernel/winfixup.S b/arch/sparc64/kernel/winfixup.S
index c0545d089c9..ade991b7d07 100644
--- a/arch/sparc64/kernel/winfixup.S
+++ b/arch/sparc64/kernel/winfixup.S
@@ -86,7 +86,7 @@ fill_fixup:
wrpr %l1, (PSTATE_IE | PSTATE_AG | PSTATE_RMO), %pstate
mov %o7, %g6
ldx [%g6 + TI_TASK], %g4
- LOAD_PER_CPU_BASE(%g1, %g2)
+ LOAD_PER_CPU_BASE(%g1, %g2, %g3)
/* This is the same as below, except we handle this a bit special
* since we must preserve %l5 and %l6, see comment above.
@@ -209,7 +209,7 @@ fill_fixup_mna:
wrpr %l1, (PSTATE_IE | PSTATE_AG | PSTATE_RMO), %pstate
mov %o7, %g6 ! Get current back.
ldx [%g6 + TI_TASK], %g4 ! Finish it.
- LOAD_PER_CPU_BASE(%g1, %g2)
+ LOAD_PER_CPU_BASE(%g1, %g2, %g3)
call mem_address_unaligned
add %sp, PTREGS_OFF, %o0
@@ -312,7 +312,7 @@ fill_fixup_dax:
wrpr %l1, (PSTATE_IE | PSTATE_AG | PSTATE_RMO), %pstate
mov %o7, %g6 ! Get current back.
ldx [%g6 + TI_TASK], %g4 ! Finish it.
- LOAD_PER_CPU_BASE(%g1, %g2)
+ LOAD_PER_CPU_BASE(%g1, %g2, %g3)
call spitfire_data_access_exception
add %sp, PTREGS_OFF, %o0