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| author | Steve Capper | 2014-10-10 00:29:23 +0200 |
|---|---|---|
| committer | Linus Torvalds | 2014-10-10 04:26:01 +0200 |
| commit | 5e5f6dc10546f5c03bc572e3ba3089af30c66e2d (patch) | |
| tree | 05c84c5be22dcb0bb752428dd4c726a0029bca8c /arch/arm64/Kconfig | |
| parent | arm: mm: enable RCU fast_gup (diff) | |
| download | kernel-qcow2-linux-5e5f6dc10546f5c03bc572e3ba3089af30c66e2d.tar.gz kernel-qcow2-linux-5e5f6dc10546f5c03bc572e3ba3089af30c66e2d.tar.xz kernel-qcow2-linux-5e5f6dc10546f5c03bc572e3ba3089af30c66e2d.zip | |
arm64: mm: enable HAVE_RCU_TABLE_FREE logic
In order to implement fast_get_user_pages we need to ensure that the page
table walker is protected from page table pages being freed from under it.
This patch enables HAVE_RCU_TABLE_FREE, any page table pages belonging to
address spaces with multiple users will be call_rcu_sched freed. Meaning
that disabling interrupts will block the free and protect the fast gup
page walker.
Signed-off-by: Steve Capper <steve.capper@linaro.org>
Tested-by: Dann Frazier <dann.frazier@canonical.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Christoffer Dall <christoffer.dall@linaro.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/arm64/Kconfig')
| -rw-r--r-- | arch/arm64/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index e96cbe84d5ae..1ffd9a05206b 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -57,6 +57,7 @@ config ARM64 select HAVE_PERF_EVENTS select HAVE_PERF_REGS select HAVE_PERF_USER_STACK_DUMP + select HAVE_RCU_TABLE_FREE select HAVE_SYSCALL_TRACEPOINTS select IRQ_DOMAIN select MODULES_USE_ELF_RELA |