diff options
Diffstat (limited to 'arch/arm64/include/asm/simd.h')
| -rw-r--r-- | arch/arm64/include/asm/simd.h | 15 |
1 files changed, 5 insertions, 10 deletions
diff --git a/arch/arm64/include/asm/simd.h b/arch/arm64/include/asm/simd.h index 7434844036d3..8e86c9e70e48 100644 --- a/arch/arm64/include/asm/simd.h +++ b/arch/arm64/include/asm/simd.h @@ -12,8 +12,6 @@ #include <linux/preempt.h> #include <linux/types.h> -DECLARE_PER_CPU(bool, fpsimd_context_busy); - #ifdef CONFIG_KERNEL_MODE_NEON /* @@ -26,15 +24,12 @@ DECLARE_PER_CPU(bool, fpsimd_context_busy); static __must_check inline bool may_use_simd(void) { /* - * fpsimd_context_busy is only set while preemption is disabled, - * and is clear whenever preemption is enabled. Since - * this_cpu_read() is atomic w.r.t. preemption, fpsimd_context_busy - * cannot change under our feet -- if it's set we cannot be - * migrated, and if it's clear we cannot be migrated to a CPU - * where it is set. + * We must make sure that the SVE has been initialized properly + * before using the SIMD in kernel. */ - return !in_irq() && !irqs_disabled() && !in_nmi() && - !this_cpu_read(fpsimd_context_busy); + return !WARN_ON(!system_capabilities_finalized()) && + system_supports_fpsimd() && + !in_hardirq() && !irqs_disabled() && !in_nmi(); } #else /* ! CONFIG_KERNEL_MODE_NEON */ |