Merge tag 'efi-next' of git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/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>

diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 2c44c07923012a58e9f430bf4754910984771556..050a092b8d9a2628c03227d06c4d8a8314d5433a 100644 (file)
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -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.