Will Deacon c2775b2ee5 arm64: switch_mm: simplify mm and CPU checks ... switch_mm performs some checks to try and avoid entering the ASID allocator: (1) If we're switching to the init_mm (no user mappings), then simply set a reserved TTBR0 value with no page table (the zero page) (2) If prev == next *and* the mm_cpumask indicates that we've run on this CPU before, then we can skip the allocator. However, there is plenty of redundancy here. With the new ASID allocator, if prev == next, then we know that our ASID is valid and do not need to worry about re-allocation. Consequently, we can drop the mm_cpumask check in (2) and move the prev == next check before the init_mm check, since if prev == next == init_mm then there's nothing to do. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>		2015-10-07 11:56:25 +01:00
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asm	arm64: switch_mm: simplify mm and CPU checks	2015-10-07 11:56:25 +01:00
uapi/asm	ARM:	2015-09-10 16:42:49 -07:00