Messages in this thread Patch in this message |  | | From | Thomas Gleixner <> | Subject | [patch 2/3] x86/fpu: Rename irq_fpu_usable() | Date | Sun, 1 May 2022 21:31:45 +0200 (CEST) |
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This can be invoked from almost any context, except NMI. The only requirement is that the context is not migrateable.
Rename it to kernel_fpu_usable().
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> --- arch/um/include/asm/fpu/api.h | 2 +- arch/x86/include/asm/fpu/api.h | 4 ++-- arch/x86/include/asm/simd.h | 2 +- arch/x86/kernel/fpu/core.c | 13 +++++++------ net/netfilter/nft_set_pipapo_avx2.c | 2 +- 5 files changed, 12 insertions(+), 11 deletions(-)
--- a/arch/um/include/asm/fpu/api.h +++ b/arch/um/include/asm/fpu/api.h @@ -11,7 +11,7 @@ #define kernel_fpu_begin() (void)0 #define kernel_fpu_end() (void)0 -static inline bool irq_fpu_usable(void) +static inline bool kernel_fpu_usable(void) { return true; } --- a/arch/x86/include/asm/fpu/api.h +++ b/arch/x86/include/asm/fpu/api.h @@ -19,7 +19,7 @@ * disables preemption so be careful if you intend to use it for long periods * of time. * If you intend to use the FPU in irq/softirq you need to check first with - * irq_fpu_usable() if it is possible. + * kernel_fpu_usable() if it is possible. */ /* Kernel FPU states to initialize in kernel_fpu_begin_mask() */ @@ -28,7 +28,7 @@ extern void kernel_fpu_begin_mask(unsigned int kfpu_mask); extern void kernel_fpu_end(void); -extern bool irq_fpu_usable(void); +extern bool kernel_fpu_usable(void); extern void fpregs_mark_activate(void); /* Code that is unaware of kernel_fpu_begin_mask() can use this */ --- a/arch/x86/include/asm/simd.h +++ b/arch/x86/include/asm/simd.h @@ -8,5 +8,5 @@ */ static __must_check inline bool may_use_simd(void) { - return irq_fpu_usable(); + return kernel_fpu_usable(); } --- a/arch/x86/kernel/fpu/core.c +++ b/arch/x86/kernel/fpu/core.c @@ -49,11 +49,12 @@ static DEFINE_PER_CPU(bool, in_kernel_fp */ DEFINE_PER_CPU(struct fpu *, fpu_fpregs_owner_ctx); -/* - * Can we use the FPU in kernel mode with the - * whole "kernel_fpu_begin/end()" sequence? +/** + * kernel_fpu_usable - Check whether kernel FPU usage is possible + * + * Has to be invoked before calling kernel_fpu_begin(). */ -bool irq_fpu_usable(void) +bool kernel_fpu_usable(void) { if (WARN_ON_ONCE(in_nmi())) return false; @@ -81,7 +82,7 @@ bool irq_fpu_usable(void) */ return !softirq_count(); } -EXPORT_SYMBOL(irq_fpu_usable); +EXPORT_SYMBOL(kernel_fpu_usable); /* * Track AVX512 state use because it is known to slow the max clock @@ -409,7 +410,7 @@ void kernel_fpu_begin_mask(unsigned int { preempt_disable(); - WARN_ON_FPU(!irq_fpu_usable()); + WARN_ON_FPU(!kernel_fpu_usable()); WARN_ON_FPU(this_cpu_read(in_kernel_fpu)); this_cpu_write(in_kernel_fpu, true); --- a/net/netfilter/nft_set_pipapo_avx2.c +++ b/net/netfilter/nft_set_pipapo_avx2.c @@ -1128,7 +1128,7 @@ bool nft_pipapo_avx2_lookup(const struct bool map_index; int i, ret = 0; - if (unlikely(!irq_fpu_usable())) + if (unlikely(!kernel_fpu_usable())) return nft_pipapo_lookup(net, set, key, ext); m = rcu_dereference(priv->match);
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