arm64: uaccess: remove redundant PAN toggling

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Some code (e.g. futex) needs to make privileged accesses to userspace
memory, and uses uaccess_{enable,disable}_privileged() in order to
permit this. All other uaccess primitives use LDTR/STTR, and never need
to toggle PAN.

Remove the redundant PAN toggling.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: James Morse <james.morse@arm.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20201202131558.39270-12-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Mark Rutland 2020-12-02 13:15:57 +00:00 • committed by Catalin Marinas

parent b5a5a01d8e

commit 7cf283c7bd

3 changed files with 19 additions and 58 deletions

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1

arch/arm64/include/asm/cpucaps.h

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59

arch/arm64/include/asm/uaccess.h

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17

arch/arm64/kernel/cpufeature.c

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