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powerpc: Fix oops if scan_dispatch_log is called too early 

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>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Anton Blanchard 2011-04-07 21:44:21 +00:00 committed by Benjamin Herrenschmidt
parent 127493d5dc
commit 84ffae55af
1 changed files with 3 additions and 0 deletions
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3
arch/powerpc/kernel/time.c
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@ -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) {