From 3352a5556f52bb49b82c0258c0c67f7371ba1f80 Mon Sep 17 00:00:00 2001 From: He Ying Date: Tue, 11 Jan 2022 22:24:10 -0500 Subject: [PATCH] arm64: entry: Save some nops when CONFIG_ARM64_PSEUDO_NMI is not set Arm64 pseudo-NMI feature code brings some additional nops when CONFIG_ARM64_PSEUDO_NMI is not set, which is not necessary. So add necessary ifdeffery to avoid it. Signed-off-by: He Ying Acked-by: Mark Rutland Link: https://lore.kernel.org/r/20220112032410.29231-1-heying24@huawei.com Signed-off-by: Will Deacon --- arch/arm64/kernel/entry.S | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S index 772ec2ecf4888..eb59621d6c6a2 100644 --- a/arch/arm64/kernel/entry.S +++ b/arch/arm64/kernel/entry.S @@ -300,6 +300,7 @@ alternative_else_nop_endif str w21, [sp, #S_SYSCALLNO] .endif +#ifdef CONFIG_ARM64_PSEUDO_NMI /* Save pmr */ alternative_if ARM64_HAS_IRQ_PRIO_MASKING mrs_s x20, SYS_ICC_PMR_EL1 @@ -307,6 +308,7 @@ alternative_if ARM64_HAS_IRQ_PRIO_MASKING mov x20, #GIC_PRIO_IRQON | GIC_PRIO_PSR_I_SET msr_s SYS_ICC_PMR_EL1, x20 alternative_else_nop_endif +#endif /* Re-enable tag checking (TCO set on exception entry) */ #ifdef CONFIG_ARM64_MTE @@ -330,6 +332,7 @@ alternative_else_nop_endif disable_daif .endif +#ifdef CONFIG_ARM64_PSEUDO_NMI /* Restore pmr */ alternative_if ARM64_HAS_IRQ_PRIO_MASKING ldr x20, [sp, #S_PMR_SAVE] @@ -339,6 +342,7 @@ alternative_if ARM64_HAS_IRQ_PRIO_MASKING dsb sy // Ensure priority change is seen by redistributor .L__skip_pmr_sync\@: alternative_else_nop_endif +#endif ldp x21, x22, [sp, #S_PC] // load ELR, SPSR -- 2.30.2