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ARM: 6255/1: Workaround infinity loop in handling of translation faults 

On ARM one Linux PGD entry contains two hardware entries (see page
tables layout in pgtable.h). We normally guarantee that we always
fill both L1 entries. But create_mapping() doesn't follow the rule.
It can create inidividual L1 entries, so here we have to call
pmd_none() check in do_translation_fault() for the entry really
corresponded to address, not for the first of pair.

Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Kirill A. Shutemov 2010-07-22 13:20:22 +01:00 committed by Russell King
parent 6338a6aa7c
commit 33a9c41bf5
1 changed files with 10 additions and 1 deletions
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11
arch/arm/mm/fault.c
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@ -413,7 +413,16 @@ do_translation_fault(unsigned long addr, unsigned int fsr,
pmd_k = pmd_offset(pgd_k, addr);
pmd = pmd_offset(pgd, addr);
if (pmd_none(*pmd_k))
/*
* On ARM one Linux PGD entry contains two hardware entries (see page
* tables layout in pgtable.h). We normally guarantee that we always
* fill both L1 entries. But create_mapping() doesn't follow the rule.
* It can create inidividual L1 entries, so here we have to call
* pmd_none() check for the entry really corresponded to address, not
* for the first of pair.
*/
index = (addr >> SECTION_SHIFT) & 1;
if (pmd_none(pmd_k[index]))
goto bad_area;
copy_pmd(pmd, pmd_k);