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* Fix a kernel panic by not passing EFI virtual mapping addresses to

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__pa() in the x86 pageattr code. Since these virtual addreses are
   not part of the direct mapping or kernel text mapping, passing them
   to __pa() will trigger a BUG_ON() when CONFIG_DEBUG_VIRTUAL is
   enabled - Sai Praneeth Prakhya
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Merge tag 'efi-next' of git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi into core/efi

Pull EFI fix from Matt Fleming:

  - Fix a kernel panic by not passing EFI virtual mapping addresses to
    __pa() in the x86 pageattr code. Since these virtual addreses are
    not part of the direct mapping or kernel text mapping, passing them
    to __pa() will trigger a BUG_ON() when CONFIG_DEBUG_VIRTUAL is
    enabled. (Sai Praneeth Prakhya)

Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2015-10-27 18:40:47 +01:00
commit 06ef431ab8
1 changed files with 6 additions and 3 deletions
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9
arch/x86/mm/pageattr.c
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@ -647,9 +647,12 @@ __split_large_page(struct cpa_data *cpa, pte_t *kpte, unsigned long address,
for (i = 0; i < PTRS_PER_PTE; i++, pfn += pfninc)
set_pte(&pbase[i], pfn_pte(pfn, canon_pgprot(ref_prot)));
if (pfn_range_is_mapped(PFN_DOWN(__pa(address)),
PFN_DOWN(__pa(address)) + 1))
split_page_count(level);
if (virt_addr_valid(address)) {
unsigned long pfn = PFN_DOWN(__pa(address));
if (pfn_range_is_mapped(pfn, pfn + 1))
split_page_count(level);
}
/*
* Install the new, split up pagetable.