Yandong Zhao 2fd8eb4ad8 arm64: neon: Fix function may_use_simd() return error status ... It does not matter if the caller of may_use_simd() migrates to another cpu after the call, but it is still important that the kernel_neon_busy percpu instance that is read matches the cpu the task is running on at the time of the read. This means that raw_cpu_read() is not sufficient. kernel_neon_busy may appear true if the caller migrates during the execution of raw_cpu_read() and the next task to be scheduled in on the initial cpu calls kernel_neon_begin(). This patch replaces raw_cpu_read() with this_cpu_read() to protect against this race. Cc: <stable@vger.kernel.org> Fixes: cb84d11e16 ("arm64: neon: Remove support for nested or hardirq kernel-mode NEON") Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Dave Martin <Dave.Martin@arm.com> Reviewed-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Yandong Zhao <yandong77520@gmail.com> Signed-off-by: Will Deacon <will.deacon@arm.com>		2018-07-11 17:02:02 +01:00
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asm	arm64: neon: Fix function may_use_simd() return error status	2018-07-11 17:02:02 +01:00
uapi/asm	Small update for KVM.	2018-06-12 11:34:04 -07:00