Commit 814f5415 authored by Ard Biesheuvel's avatar Ard Biesheuvel
Browse files

ARM/simd: Add scoped guard API for kernel mode SIMD 



Implement the ksimd scoped guard API so that it can be used by code that
supports both ARM and arm64.

Reviewed-by: default avatarKees Cook <kees@kernel.org>
Reviewed-by: default avatarEric Biggers <ebiggers@kernel.org>
Reviewed-by: default avatarJonathan Cameron <jonathan.cameron@huawei.com>
Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarArd Biesheuvel <ardb@kernel.org>
parent c5b91a17

arch/arm/include/asm/simd.h

+7 −0
Original line number Diff line number Diff line
@@ -2,14 +2,21 @@ 
#ifndef _ASM_SIMD_H

#define _ASM_SIMD_H



#include <linux/cleanup.h>

#include <linux/compiler_attributes.h>

#include <linux/preempt.h>

#include <linux/types.h>



#include <asm/neon.h>



static __must_check inline bool may_use_simd(void)

{

	return IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && !in_hardirq()

	       && !irqs_disabled();

}



DEFINE_LOCK_GUARD_0(ksimd, kernel_neon_begin(), kernel_neon_end())



#define scoped_ksimd()	scoped_guard(ksimd)



#endif	/* _ASM_SIMD_H */