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kmemleak: Ignore the aperture memory hole on x86_64

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This block is allocated with alloc_bootmem() and scanned by kmemleak but
the kernel direct mapping may no longer exist. This patch tells kmemleak
to ignore this memory hole. The dma32_bootmem_ptr in
dma32_reserve_bootmem() is also ignored.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Catalin Marinas
2009-08-27 14:29:20 +01:00
parent 0494e08281
commit acde31dc46
2 changed files with 12 additions and 0 deletions
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6
arch/x86/kernel/aperture_64.c
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@ -20,6 +20,7 @@
#include <linux/bitops.h>
#include <linux/ioport.h>
#include <linux/suspend.h>
#include <linux/kmemleak.h>
#include <asm/e820.h>
#include <asm/io.h>
#include <asm/iommu.h>
@ -94,6 +95,11 @@ static u32 __init allocate_aperture(void)
* code for safe
*/
p = __alloc_bootmem_nopanic(aper_size, aper_size, 512ULL<<20);
/*
* Kmemleak should not scan this block as it may not be mapped via the
* kernel direct mapping.
*/
kmemleak_ignore(p);
if (!p || __pa(p)+aper_size > 0xffffffff) {
printk(KERN_ERR
"Cannot allocate aperture memory hole (%p,%uK)\n",