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riscv: Turn has_fpu into a static key if FPU=y

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The has_fpu check sits at hot code path: switch_to(). Currently, has_fpu
is a bool variable if FPU=y, switch_to() checks it each time, we can
optimize out this check by turning the has_fpu into a static key.

Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Jisheng Zhang
2021-05-12 22:55:45 +08:00
committed by Palmer Dabbelt
parent 8237c5243a
commit 37a7a2a10e
4 changed files with 13 additions and 8 deletions
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arch/riscv/kernel/process.c
+1 -1
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@@ -87,7 +87,7 @@ void start_thread(struct pt_regs *regs, unsigned long pc,
unsigned long sp)
{
regs->status = SR_PIE;
if (has_fpu) {
if (has_fpu()) {
regs->status |= SR_FS_INITIAL;
/*
* Restore the initial value to the FP register