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Peter Anvin" , Andrey Konovalov , bpf@vger.kernel.org, kernel-team@meta.com, kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v1 3/5] x86/cpu: Introduce identify_cpu_32() helper Date: Fri, 3 Jul 2026 17:20:44 -0700 Message-ID: <20260704002046.3859585-4-ihor.solodrai@linux.dev> In-Reply-To: <20260704002046.3859585-1-ihor.solodrai@linux.dev> References: <20260704002046.3859585-1-ihor.solodrai@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 7379740006 X-Stat-Signature: ga6ueznc594a74jhfuidfkqs5sxye5ap X-HE-Tag: 1783124480-733261 X-HE-Meta: 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 cUHBh2CI kQ2/SqPdygW/hsIjl2wK9m1X+4p5ImihHyh4RQiqyu8NfepxM1SaBJAn4rs4gSNOWOEaQxmEw1meK6dB1UK6prjE00rWAjwhGRdOjJu+duHyYW0kJ+mJMprvg/W3I+C6y3JBIxcr8ahp06ED9obLV7iF/W3XDx+7r3CVQDl5PBph4jJTEFoSJo+sSXqrz5z6oS4okCX5BmUj2dDEK5fqEyHKQgj+Sz0Ab9LEsTFyvlwYpjxXSyxo+ydmP09lPgNbotXgbQV9Hj3Yq5mx4yOnEkvgG4VYkS5ws/sVEx4WlkSuANnnJdLOeO+LmQIc9dlrVMdx2 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Both identify_boot_cpu() and identify_secondary_cpu() call enable_sep_cpu() under a CONFIG_X86_32 #ifdef. Move that into a new identify_cpu_32() helper guarded by IS_ENABLED(CONFIG_X86_32). Signed-off-by: Ihor Solodrai --- arch/x86/kernel/cpu/common.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index b9a736728a0e..519e495c4a14 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -2146,14 +2146,20 @@ void enable_sep_cpu(void) } #endif +static void identify_cpu_32(struct cpuinfo_x86 *c) +{ + if (!IS_ENABLED(CONFIG_X86_32)) + return; + + enable_sep_cpu(); +} + static __init void identify_boot_cpu(void) { identify_cpu(&boot_cpu_data); if (HAS_KERNEL_IBT && cpu_feature_enabled(X86_FEATURE_IBT)) pr_info("CET detected: Indirect Branch Tracking enabled\n"); -#ifdef CONFIG_X86_32 - enable_sep_cpu(); -#endif + identify_cpu_32(&boot_cpu_data); cpu_detect_tlb(&boot_cpu_data); setup_cr_pinning(); @@ -2173,9 +2179,7 @@ void identify_secondary_cpu(unsigned int cpu) c->cpu_index = cpu; identify_cpu(c); -#ifdef CONFIG_X86_32 - enable_sep_cpu(); -#endif + identify_cpu_32(c); x86_spec_ctrl_setup_ap(); update_srbds_msr(); if (boot_cpu_has_bug(X86_BUG_GDS)) -- 2.54.0