ARM: tlb: delay page freeing for SMP and ARMv7 CPUs

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We need to delay freeing any mapped page on SMP and ARMv7 systems to
ensure that the data is not accessed by other CPUs, or is used for
speculative prefetch with ARMv7.  This includes not only mapped pages
but also pages used for the page tables themselves.

This avoids races with the MMU/other CPUs accessing pages after they've
been freed but before we've invalidated the TLB.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

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Russell King 2011-02-20 12:16:45 +00:00

parent a9ad21fed0

commit 06824ba824

1 changed files with 89 additions and 13 deletions

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arch/arm/include/asm/tlb.h

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