From: Mark Brown <broonie@kernel.org> In order to allow assembly code to ensure that not even superpriorty interrupts can preempt it provide macros for enabling and disabling ALLINT.ALLINT. This is not integrated into the existing DAIF macros since we do not always wish to manage ALLINT along with DAIF and the use of DAIF in the naming of the existing macros might lead to surprises if ALLINT is also managed. Signed-off-by: Mark Brown <broonie@kernel.org> Signed-off-by: Jie Liu <liujie375@h-partners.com> --- arch/arm64/include/asm/assembler.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h index 4e0c07c60f84..192d61b68d7d 100644 --- a/arch/arm64/include/asm/assembler.h +++ b/arch/arm64/include/asm/assembler.h @@ -23,6 +23,22 @@ #include <asm/ptrace.h> #include <asm/thread_info.h> + .macro disable_allint +#ifdef CONFIG_ARM64_NMI +alternative_if ARM64_HAS_NMI + msr_s SYS_ALLINT_SET, xzr +alternative_else_nop_endif +#endif + .endm + + .macro enable_allint +#ifdef CONFIG_ARM64_NMI +alternative_if ARM64_HAS_NMI + msr_s SYS_ALLINT_CLR, xzr +alternative_else_nop_endif +#endif + .endm + .macro save_and_disable_daif, flags mrs \flags, daif msr daifset, #0xf -- 2.25.1