linux-kernel - [PATCH 5/9] arm64/cpufeature: Use alternatives to check enabled ARM64_HAS

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Date: Tue, 9 Apr 2024 01:23:40 +0000
From: Liao Chang <liaochang1@...wei.com>
To: <catalin.marinas@....com>, <will@...nel.org>, <maz@...nel.org>,
	<oliver.upton@...ux.dev>, <james.morse@....com>, <suzuki.poulose@....com>,
	<yuzenghui@...wei.com>, <tglx@...utronix.de>, <mark.rutland@....com>,
	<ardb@...nel.org>, <broonie@...nel.org>, <liaochang1@...wei.com>,
	<anshuman.khandual@....com>, <miguel.luis@...cle.com>, <joey.gouly@....com>,
	<ryan.roberts@....com>, <jeremy.linton@....com>, <liwei391@...wei.com>,
	<daniel.thompson@...aro.org>, <sumit.garg@...aro.org>,
	<kristina.martsenko@....com>, <jpoimboe@...nel.org>, <ericchancf@...gle.com>,
	<robh@...nel.org>, <scott@...amperecomputing.com>,
	<songshuaishuai@...ylab.org>, <shijie@...amperecomputing.com>,
	<bhe@...hat.com>, <akpm@...ux-foundation.org>, <thunder.leizhen@...wei.com>,
	<horms@...nel.org>, <rmk+kernel@...linux.org.uk>, <takakura@...inux.co.jp>,
	<dianders@...omium.org>, <swboyd@...omium.org>, <frederic@...nel.org>,
	<reijiw@...gle.com>, <akihiko.odaki@...nix.com>, <ruanjinjie@...wei.com>
CC: <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	<kvmarm@...ts.linux.dev>
Subject: [PATCH 5/9] arm64/cpufeature: Use alternatives to check enabled ARM64_HAS_NMI feature

Due to the historical reasons, cpus_have_const_cap() is more complicated
than it needs to be. When CONFIG_ARM64_NMI=y the ARM64_HAS_NMI cpucap is
a strict boot cpu feature which is detected and patched early on the
boot cpu, which means no code depends on ARM64_HAS_NMI cpucap run in the
window between the ARM64_HAS_NMI cpucap is detected and alternative is
patched. So it would be nice to migrate caller over to
alternative_has_cap_likey().

Signed-off-by: Liao Chang <liaochang1@...wei.com>
---
 arch/arm64/include/asm/cpufeature.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
index dc8b2d0d3763..4c35565ad656 100644
--- a/arch/arm64/include/asm/cpufeature.h
+++ b/arch/arm64/include/asm/cpufeature.h
@@ -803,7 +803,7 @@ static __always_inline bool system_uses_irq_prio_masking(void)
 static __always_inline bool system_uses_nmi(void)
 {
 	return IS_ENABLED(CONFIG_ARM64_NMI) &&
-		cpus_have_const_cap(ARM64_USES_NMI);
+		alternative_has_cap_likely(ARM64_USES_NMI);
 }
 
 static inline bool system_supports_mte(void)
-- 
2.34.1