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authorPeter Collingbourne <pcc@google.com>2021-09-15 12:03:35 -0700
committerCatalin Marinas <catalin.marinas@arm.com>2021-09-21 12:17:30 +0100
commit8c8a3b5bd960cd88f7655b5251dc28741e11f139 (patch)
treebc716ac5b48029dcdb82f57361d50b35e417ae4d /arch/arm64/lib
parent9fcb2e93f41c07a400885325e7dbdfceba6efaec (diff)
downloadlinux-8c8a3b5bd960cd88f7655b5251dc28741e11f139.tar.bz2
arm64: add MTE supported check to thread switching and syscall entry/exit
This lets us avoid doing unnecessary work on hardware that does not support MTE, and will allow us to freely use MTE instructions in the code called by mte_thread_switch(). Since this would mean that we do a redundant check in mte_check_tfsr_el1(), remove it and add two checks now required in its callers. This also avoids an unnecessary DSB+ISB sequence on the syscall exit path for hardware not supporting MTE. Fixes: 65812c6921cc ("arm64: mte: Enable async tag check fault") Cc: <stable@vger.kernel.org> # 5.13.x Signed-off-by: Peter Collingbourne <pcc@google.com> Link: https://linux-review.googlesource.com/id/I02fd000d1ef2c86c7d2952a7f099b254ec227a5d Link: https://lore.kernel.org/r/20210915190336.398390-1-pcc@google.com [catalin.marinas@arm.com: adjust the commit log slightly] Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/lib')
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