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| author | Toshi Kani <toshi.kani@hpe.com> | 2015-09-17 21:24:24 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2015-09-22 22:27:33 +0300 |
| commit | 55696b1f664e52b3036f21631f9c2247b667f587 (patch) | |
| tree | 1f4f453b3391bb7a451c61e2422e79760255c51a /arch/x86/mm/pageattr.c | |
| parent | d551aaa2f7e1387fa66093ce9914c2e91f283a50 (diff) | |
| download | linux-55696b1f664e52b3036f21631f9c2247b667f587.tar.xz | |
x86/mm: Fix no-change case in try_preserve_large_page()
try_preserve_large_page() checks if new_prot is the same as
old_prot. If so, it simply sets do_split to 0, and returns
with no-operation. However, old_prot is set as a 4KB pgprot
value while new_prot is a large page pgprot value.
Now that old_prot is initially set from p?d_pgprot() as a
large page pgprot value, fix it by not overwriting old_prot
with a 4KB pgprot value.
Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Juergen Gross <jgross@suse.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Konrad Wilk <konrad.wilk@oracle.com>
Cc: Robert Elliot <elliott@hpe.com>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/1442514264-12475-12-git-send-email-toshi.kani@hpe.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/mm/pageattr.c')
| -rw-r--r-- | arch/x86/mm/pageattr.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index ab9465b9160f..e2621a8e8213 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -518,7 +518,7 @@ try_preserve_large_page(pte_t *kpte, unsigned long address, * up accordingly. */ old_pte = *kpte; - old_prot = req_prot = pgprot_large_2_4k(old_prot); + req_prot = pgprot_large_2_4k(old_prot); pgprot_val(req_prot) &= ~pgprot_val(cpa->mask_clr); pgprot_val(req_prot) |= pgprot_val(cpa->mask_set); |