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SubjectRe: [RFC PATCH 3/6] arm64: Use update{,_tsk}_thread_flag()
On Thu, Apr 19, 2018 at 11:58:45AM +0100, Dave Martin wrote:
> This patch uses the new update_thread_flag() helpers to simplify a
> couple of if () set; else clear; constructs.
>
> No functional change.
>
> Signed-off-by: Dave Martin <Dave.Martin@arm.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will.deacon@arm.com>
> ---
> arch/arm64/kernel/fpsimd.c | 19 +++++++------------
> 1 file changed, 7 insertions(+), 12 deletions(-)
>
> diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c
> index 87a3536..0c4e7e0 100644
> --- a/arch/arm64/kernel/fpsimd.c
> +++ b/arch/arm64/kernel/fpsimd.c
> @@ -618,10 +618,8 @@ int sve_set_vector_length(struct task_struct *task,
> task->thread.sve_vl = vl;
>
> out:
> - if (flags & PR_SVE_VL_INHERIT)
> - set_tsk_thread_flag(task, TIF_SVE_VL_INHERIT);
> - else
> - clear_tsk_thread_flag(task, TIF_SVE_VL_INHERIT);
> + update_tsk_thread_flag(task, TIF_SVE_VL_INHERIT,
> + flags & PR_SVE_VL_INHERIT);
>
> return 0;
> }
> @@ -902,7 +900,7 @@ void fpsimd_thread_switch(struct task_struct *next)
> if (current->mm)
> task_fpsimd_save();
>
> - if (next->mm) {
> + if (next->mm)
> /*
> * If we are switching to a task whose most recent userland
> * FPSIMD state is already in the registers of *this* cpu,
> @@ -910,13 +908,10 @@ void fpsimd_thread_switch(struct task_struct *next)
> * the TIF_FOREIGN_FPSTATE flag so the state will be loaded
> * upon the next return to userland.
> */
> - if (__this_cpu_read(fpsimd_last_state.st) ==
> - &next->thread.uw.fpsimd_state
> - && next->thread.fpsimd_cpu == smp_processor_id())
> - clear_tsk_thread_flag(next, TIF_FOREIGN_FPSTATE);
> - else
> - set_tsk_thread_flag(next, TIF_FOREIGN_FPSTATE);
> - }
> + update_tsk_thread_flag(next, TIF_FOREIGN_FPSTATE,
> + __this_cpu_read(fpsimd_last_state.st) !=
> + &next->thread.uw.fpsimd_state ||
> + next->thread.fpsimd_cpu != smp_processor_id());

This will conflict with some patches in-flight from a chap called Dave
Martin ;)

Other than that:

Acked-by: Will Deacon <will.deacon@arm.com>

Will

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