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authorMichael Ellerman <michael@ellerman.id.au>2008-04-29 23:21:45 -0400
committerPaul Mackerras <paulus@samba.org>2008-04-30 05:49:48 -0400
commit3243d87441bf7f97c5c9f7dd46b35f5783ec6740 (patch)
tree7765277523d0146bccb5bde64df67b13723211a9 /arch/powerpc
parent595f403c1af37b1339e64b89040528b8cd48c5a3 (diff)
[POWERPC] Make emergency stack safe for current_thread_info() use
The current_thread_info() macro, used by preempt_count(), assumes the base address and size of the stack are THREAD_SIZE aligned. The emergency stack currently isn't either of these things, which could potentially cause problems anytime we're running on the emergency stack. That includes when we detect a bad kernel stack pointer, and also during early_setup_secondary(). Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/kernel/setup_64.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index dff6308d1b5e..25e3fd8606ab 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -487,9 +487,12 @@ static void __init emergency_stack_init(void)
487 */ 487 */
488 limit = min(0x10000000UL, lmb.rmo_size); 488 limit = min(0x10000000UL, lmb.rmo_size);
489 489
490 for_each_possible_cpu(i) 490 for_each_possible_cpu(i) {
491 paca[i].emergency_sp = 491 unsigned long sp;
492 __va(lmb_alloc_base(HW_PAGE_SIZE, 128, limit)) + HW_PAGE_SIZE; 492 sp = lmb_alloc_base(THREAD_SIZE, THREAD_SIZE, limit);
493 sp += THREAD_SIZE;
494 paca[i].emergency_sp = __va(sp);
495 }
493} 496}
494 497
495/* 498/*