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author | Ingo Molnar <mingo@kernel.org> | 2018-03-20 08:08:02 +0100 |
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committer | Ingo Molnar <mingo@kernel.org> | 2018-03-20 08:08:02 +0100 |
commit | 10c18c44a6494167e7a7ca3a3a61a67972017bdf (patch) | |
tree | 20c3afe744b0d88783161169ec88e45a53662fe7 /arch/arm64/mm/mmu.c | |
parent | 9e49e2447c6385e45c6fddd70d6c0e917e21b669 (diff) | |
parent | 1b5f3ba415fe4cf8b8b39c8d104ed44cde330658 (diff) | |
download | blackbird-obmc-linux-10c18c44a6494167e7a7ca3a3a61a67972017bdf.tar.gz blackbird-obmc-linux-10c18c44a6494167e7a7ca3a3a61a67972017bdf.zip |
Merge branch 'linus' into sched/core, to pick up fixes
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/arm64/mm/mmu.c')
-rw-r--r-- | arch/arm64/mm/mmu.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index 84a019f55022..8c704f1e53c2 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -108,7 +108,7 @@ static bool pgattr_change_is_safe(u64 old, u64 new) * The following mapping attributes may be updated in live * kernel mappings without the need for break-before-make. */ - static const pteval_t mask = PTE_PXN | PTE_RDONLY | PTE_WRITE; + static const pteval_t mask = PTE_PXN | PTE_RDONLY | PTE_WRITE | PTE_NG; /* creating or taking down mappings is always safe */ if (old == 0 || new == 0) @@ -118,9 +118,9 @@ static bool pgattr_change_is_safe(u64 old, u64 new) if ((old | new) & PTE_CONT) return false; - /* Transitioning from Global to Non-Global is safe */ - if (((old ^ new) == PTE_NG) && (new & PTE_NG)) - return true; + /* Transitioning from Non-Global to Global is unsafe */ + if (old & ~new & PTE_NG) + return false; return ((old ^ new) & ~mask) == 0; } |