* [PATCH] powerpc: Fix oops if scan_dispatch_log is called too early
@ 2011-04-08 7:44 Anton Blanchard
0 siblings, 0 replies; only message in thread
From: Anton Blanchard @ 2011-04-08 7:44 UTC (permalink / raw)
To: benh, paulus; +Cc: linuxppc-dev
We currently enable interrupts before the dispatch log for the boot
cpu is setup. If a timer interrupt comes in early enough we oops in
scan_dispatch_log:
Unable to handle kernel paging request for data at address 0x00000010
...
.scan_dispatch_log+0xb0/0x170
.account_system_vtime+0xa0/0x220
.irq_enter+0x88/0xc0
.do_IRQ+0x48/0x230
The patch below adds a check to scan_dispatch_log to ensure the
dispatch log has been allocated.
Signed-off-by: Anton Blanchard <anton@samba.org>
Cc: <stable@kernel.org>
---
Index: powerpc.git/arch/powerpc/kernel/time.c
===================================================================
--- powerpc.git.orig/arch/powerpc/kernel/time.c 2011-04-05 18:38:40.814489516 +1000
+++ powerpc.git/arch/powerpc/kernel/time.c 2011-04-08 12:16:41.864748155 +1000
@@ -229,6 +229,9 @@ static u64 scan_dispatch_log(u64 stop_tb
u64 stolen = 0;
u64 dtb;
+ if (!dtl)
+ return 0;
+
if (i == vpa->dtl_idx)
return 0;
while (i < vpa->dtl_idx) {
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2011-04-08 7:44 [PATCH] powerpc: Fix oops if scan_dispatch_log is called too early Anton Blanchard
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