* [PATCH] bugfix for HIGHMEM_DEBUG
@ 2002-12-05 16:30 Rik van Riel
0 siblings, 0 replies; only message in thread
From: Rik van Riel @ 2002-12-05 16:30 UTC (permalink / raw)
To: Marcelo Tosatti; +Cc: linux-kernel, linux-mm
Hi Marcelo,
I found a bug in the HIGHMEM_DEBUG code, in kunmap_atomic()
to be specific. The problem is that kunmap_atomic() can get
called with an address which isn't page aligned, but we compare
that address to a page aligned address and bug if the two
aren't equal.
The obvious fix is to page-align the address before doing the
check, we're not doing anything else with it anyway since
kunmap_atomic() is a nop if HIGHMEM_DEBUG is off.
please apply,
Rik
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--- include/asm/highmem.h.orig 2002-12-05 13:23:31.000000000 -0200
+++ include/asm/highmem.h 2002-12-05 13:13:18.000000000 -0200
@@ -106,7 +106,7 @@
static inline void kunmap_atomic(void *kvaddr, enum km_type type)
{
#if HIGHMEM_DEBUG
- unsigned long vaddr = (unsigned long) kvaddr;
+ unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
enum fixed_addresses idx = type + KM_TYPE_NR*smp_processor_id();
if (vaddr < FIXADDR_START) // FIXME
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2002-12-05 16:30 [PATCH] bugfix for HIGHMEM_DEBUG Rik van Riel
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