linux-stable/arch/x86/mm
Dave Hansen dcb32d9913 x86/mm: Use pte_none() to test for empty PTE
The page table manipulation code seems to have grown a couple of
sites that are looking for empty PTEs.  Just in case one of these
entries got a stray bit set, use pte_none() instead of checking
for a zero pte_val().

The use pte_same() makes me a bit nervous.  If we were doing a
pte_same() check against two cleared entries and one of them had
a stray bit set, it might fail the pte_same() check.  But, I
don't think we ever _do_ pte_same() for cleared entries.  It is
almost entirely used for checking for races in fault-in paths.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave@sr71.net>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Luis R. Rodriguez <mcgrof@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Toshi Kani <toshi.kani@hp.com>
Cc: dave.hansen@intel.com
Cc: linux-mm@kvack.org
Cc: mhocko@suse.com
Link: http://lkml.kernel.org/r/20160708001915.813703D9@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-07-13 09:43:25 +02:00
..
kmemcheck x86: Replace __get_cpu_var uses 2014-08-26 13:45:49 -04:00
amdtopology.c
debug_pagetables.c x86/mm/ptdump: Make (debugfs)/kernel_page_tables read-only 2015-12-04 12:55:01 +01:00
dump_pagetables.c x86/mm/ptdump: Remove paravirt_enabled() 2016-02-20 12:25:45 +01:00
extable.c x86/segments/64: When loadsegment(fs, ...) fails, clear the base 2016-04-29 11:56:41 +02:00
fault.c x86/mm: Switch from TASK_SIZE to TASK_SIZE_MAX in the page fault code 2016-05-20 09:10:03 +02:00
gup.c Merge branch 'mm-pkeys-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-03-20 19:08:56 -07:00
highmem_32.c kmap_atomic_to_page() has no users, remove it 2015-11-09 15:11:24 -08:00
hugetlbpage.c x86: mm: use hugetlb_bad_size() 2016-05-19 19:12:14 -07:00
ident_map.c x86/boot: Add missing file header comments 2016-05-10 10:12:03 +02:00
init.c x86/cpufeature: Remove cpu_has_pse 2016-03-31 13:35:10 +02:00
init_32.c Merge branch 'x86-boot-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-05-16 15:54:01 -07:00
init_64.c x86/mm: Use pte_none() to test for empty PTE 2016-07-13 09:43:25 +02:00
iomap_32.c Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-06-22 17:59:09 -07:00
ioremap.c x86/cpufeature: Remove cpu_has_pse 2016-03-31 13:35:10 +02:00
kasan_init_64.c x86/kasan: Write protect kasan zero shadow 2016-02-09 13:33:14 +01:00
kmmio.c x86/mm/kmmio: Fix mmiotrace for hugepages 2016-03-05 13:24:41 +01:00
Makefile x86/mm: Build arch/x86/mm/tlb.c even on !SMP 2016-04-28 11:44:19 +02:00
mm_internal.h x86: Enable PAT to use cache mode translation tables 2014-11-16 11:04:26 +01:00
mmap.c Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-03-15 10:45:39 -07:00
mmio-mod.c
mpx.c Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-03-24 09:47:32 -07:00
numa.c include/linux/nodemask.h: create next_node_in() helper 2016-05-19 19:12:14 -07:00
numa_32.c x86: Fix the initialization of physnode_map 2014-02-01 22:15:51 -08:00
numa_64.c
numa_emulation.c
numa_internal.h
pageattr-test.c x86/mm/pat: Make mm/pageattr[-test].c explicitly non-modular 2015-08-25 09:48:38 +02:00
pageattr.c x86/mm: Use pte_none() to test for empty PTE 2016-07-13 09:43:25 +02:00
pat.c x86/mm/pat, /dev/mem: Remove superfluous error message 2016-07-08 11:52:58 +02:00
pat_internal.h x86/mm/pat: Convert to pr_*() usage 2015-05-27 14:40:59 +02:00
pat_rbtree.c x86/mm/pat: Change free_memtype() to support shrinking case 2016-01-05 11:10:23 +01:00
pf_in.c
pf_in.h
pgtable.c x86: get rid of superfluous __GFP_REPEAT 2016-06-24 17:23:52 -07:00
pgtable_32.c x86/mm: Use pte_none() to test for empty PTE 2016-07-13 09:43:25 +02:00
physaddr.c
physaddr.h
pkeys.c mm/core, x86/mm/pkeys: Add execute-only protection keys support 2016-02-18 19:46:33 +01:00
setup_nx.c Revert "x86/mm/32: Set NX in __supported_pte_mask before enabling paging" 2016-04-26 19:52:57 +02:00
srat.c x86/mm: Introduce max_possible_pfn 2015-12-06 12:46:31 +01:00
testmmiotrace.c
tlb.c x86/mm, sched/core: Turn off IRQs in switch_mm() 2016-04-28 11:44:20 +02:00