[PATCH AUTOSEL 4.4 05/17] x86/mm: Check for pfn instead of page in vmalloc_sync_one()

[Sasha Levin]

From: Joerg Roedel <jroe...@suse.de>

[ Upstream commit 51b75b5b563a2637f9d8dc5bd02a31b2ff9e5ea0 ]

Do not require a struct page for the mapped memory location because it
might not exist. This can happen when an ioremapped region is mapped with
2MB pages.

Fixes: 5d72b4fba40ef ('x86, mm: support huge I/O mapping capability I/F')
Signed-off-by: Joerg Roedel <jroe...@suse.de>
Signed-off-by: Thomas Gleixner <t...@linutronix.de>
Reviewed-by: Dave Hansen <dave.han...@linux.intel.com>
Link: https://lkml.kernel.org/r/20190719184652.11391-2-j...@8bytes.org
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 arch/x86/mm/fault.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 462c5c30b9a21..f3511f1a8f0ea 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -222,7 +222,7 @@ static inline pmd_t *vmalloc_sync_one(pgd_t *pgd, unsigned 
long address)
        if (!pmd_present(*pmd))
                set_pmd(pmd, *pmd_k);
        else
-               BUG_ON(pmd_page(*pmd) != pmd_page(*pmd_k));
+               BUG_ON(pmd_pfn(*pmd) != pmd_pfn(*pmd_k));
 
        return pmd_k;
 }
-- 
2.20.1