Commit 4e602056 authored by Will Deacon's avatar Will Deacon Committed by Catalin Marinas

arm64: mm: Permit transitioning from Global to Non-Global without BBM

Break-before-make is not needed when transitioning from Global to
Non-Global mappings, provided that the contiguous hint is not being used.
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 41acec62
...@@ -118,6 +118,10 @@ static bool pgattr_change_is_safe(u64 old, u64 new) ...@@ -118,6 +118,10 @@ static bool pgattr_change_is_safe(u64 old, u64 new)
if ((old | new) & PTE_CONT) if ((old | new) & PTE_CONT)
return false; return false;
/* Transitioning from Global to Non-Global is safe */
if (((old ^ new) == PTE_NG) && (new & PTE_NG))
return true;
return ((old ^ new) & ~mask) == 0; return ((old ^ new) & ~mask) == 0;
} }
......
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