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generic debug pagealloc

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CONFIG_DEBUG_PAGEALLOC is now supported by x86, powerpc, sparc64, and
s390.  This patch implements it for the rest of the architectures by
filling the pages with poison byte patterns after free_pages() and
verifying the poison patterns before alloc_pages().

This generic one cannot detect invalid page accesses immediately but
invalid read access may cause invalid dereference by poisoned memory and
invalid write access can be detected after a long delay.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Akinobu Mita
2009-03-31 15:23:17 -07:00
committed by Linus Torvalds
parent 610a77e04a
commit 6a11f75b6a
16 changed files with 202 additions and 19 deletions
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18
arch/avr32/mm/fault.c
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@ -250,21 +250,3 @@ asmlinkage void do_bus_error(unsigned long addr, int write_access,
dump_dtlb();
die("Bus Error", regs, SIGKILL);
}
/*
* This functionality is currently not possible to implement because
* we're using segmentation to ensure a fixed mapping of the kernel
* virtual address space.
*
* It would be possible to implement this, but it would require us to
* disable segmentation at startup and load the kernel mappings into
* the TLB like any other pages. There will be lots of trickery to
* avoid recursive invocation of the TLB miss handler, though...
*/
#ifdef CONFIG_DEBUG_PAGEALLOC
void kernel_map_pages(struct page *page, int numpages, int enable)
{
}
EXPORT_SYMBOL(kernel_map_pages);
#endif