sparc64: Add basic validations to {pud,pmd}_bad().

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[ Upstream commit 26cf432551 ]

Instead of returning false we should at least check the most basic
things, otherwise page table corruptions will be very difficult to
debug.

PMD and PTE tables are of size PAGE_SIZE, so none of the sub-PAGE_SIZE
bits should be set.

We also complement this with a check that the physical address the
pud/pmd points to is valid memory.

PowerPC was used as a guide while implementating this.

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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David S. Miller 2014-04-29 13:03:27 -07:00 • committed by Greg Kroah-Hartman

parent eb8ab8736f

commit e4f2eef20c

1 changed files with 31 additions and 15 deletions

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arch/sparc/include/asm/pgtable_64.h

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