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From: David Kaplan <david.kaplan@amd.com>
To: Thomas Gleixner <tglx@linutronix.de>,
	Borislav Petkov <bp@alien8.de>,
	Peter Zijlstra <peterz@infradead.org>,
	Josh Poimboeuf <jpoimboe@kernel.org>,
	Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
	Ingo Molnar <mingo@redhat.com>,
	Dave Hansen <dave.hansen@linux.intel.com>, <x86@kernel.org>,
	"H . Peter Anvin" <hpa@zytor.com>
Cc: <linux-kernel@vger.kernel.org>
Subject: [PATCH v3 4/7] x86/bugs: Remove uses of cpu_mitigations_off()
Date: Mon, 15 Sep 2025 08:47:03 -0500	[thread overview]
Message-ID: <20250915134706.3201818-5-david.kaplan@amd.com> (raw)
In-Reply-To: <20250915134706.3201818-1-david.kaplan@amd.com>

cpu_mitigations_off() is no longer needed because all bugs use attack
vector controls to select a mitigation, and cpu_mitigations_off() is
equivalent to no attack vectors being selected.

Remove the few remaining unnecessary uses of this function in this file.

Signed-off-by: David Kaplan <david.kaplan@amd.com>
Reviewed-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
---
 arch/x86/kernel/cpu/bugs.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index fe57e890d56c..d52600b89d60 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -687,8 +687,7 @@ static const char * const mmio_strings[] = {
 
 static void __init mmio_select_mitigation(void)
 {
-	if (!boot_cpu_has_bug(X86_BUG_MMIO_STALE_DATA) ||
-	     cpu_mitigations_off()) {
+	if (!boot_cpu_has_bug(X86_BUG_MMIO_STALE_DATA)) {
 		mmio_mitigation = MMIO_MITIGATION_OFF;
 		return;
 	}
@@ -3130,14 +3129,15 @@ static void __init srso_select_mitigation(void)
 
 static void __init srso_update_mitigation(void)
 {
+	if (!boot_cpu_has_bug(X86_BUG_SRSO))
+		return;
+
 	/* If retbleed is using IBPB, that works for SRSO as well */
 	if (retbleed_mitigation == RETBLEED_MITIGATION_IBPB &&
 	    boot_cpu_has(X86_FEATURE_IBPB_BRTYPE))
 		srso_mitigation = SRSO_MITIGATION_IBPB;
 
-	if (boot_cpu_has_bug(X86_BUG_SRSO) &&
-	    !cpu_mitigations_off())
-		pr_info("%s\n", srso_strings[srso_mitigation]);
+	pr_info("%s\n", srso_strings[srso_mitigation]);
 }
 
 static void __init srso_apply_mitigation(void)
-- 
2.34.1


  parent reply	other threads:[~2025-09-15 13:47 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-09-15 13:46 [PATCH v3 0/7] Bugs clean-up David Kaplan
2025-09-15 13:47 ` [PATCH v3 1/7] x86/bugs: Use early_param for spectre_v2_user David Kaplan
2025-09-15 13:47 ` [PATCH v3 2/7] x86/bugs: Use early_param for spectre_v2 David Kaplan
2025-09-15 13:47 ` [PATCH v3 3/7] x86/bugs: Simplify SSB cmdline parsing David Kaplan
2025-09-15 13:47 ` David Kaplan [this message]
2025-09-15 13:47 ` [PATCH v3 5/7] x86/bugs: Fix spectre_v2 forcing David Kaplan
2025-09-15 13:47 ` [PATCH v3 6/7] x86/bugs: Fix reporting of LFENCE retpoline David Kaplan
2025-09-16 12:54   ` [tip: x86/bugs] " tip-bot2 for David Kaplan
2025-09-15 13:47 ` [PATCH v3 7/7] x86/bugs: Report correct retbleed mitigation status David Kaplan
2025-09-16 12:54   ` [tip: x86/bugs] " tip-bot2 for David Kaplan

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