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From: Ihor Solodrai <ihor.solodrai@linux.dev>
To: Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Ingo Molnar <mingo@redhat.com>, Thomas Gleixner <tglx@kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>,
	Andrii Nakryiko <andrii@kernel.org>,
	Andrey Ryabinin <ryabinin.a.a@gmail.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	"H . Peter Anvin" <hpa@zytor.com>,
	Andrey Konovalov <andreyknvl@gmail.com>,
	bpf@vger.kernel.org, kernel-team@meta.com,
	kasan-dev@googlegroups.com, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH v1 2/5] x86/cpu: Inline generic_identify() into identify_cpu()
Date: Fri,  3 Jul 2026 17:20:43 -0700	[thread overview]
Message-ID: <20260704002046.3859585-3-ihor.solodrai@linux.dev> (raw)
In-Reply-To: <20260704002046.3859585-1-ihor.solodrai@linux.dev>

generic_identify() is only ever called from identify_cpu(),
immediately after the cpuinfo reset. Fold it into identify_cpu() so
that a single function does the job for both the boot CPU and the
secondary CPUs.

Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev>
---
 arch/x86/kernel/cpu/common.c | 73 +++++++++++++++++-------------------
 1 file changed, 34 insertions(+), 39 deletions(-)

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 505ce329e821..b9a736728a0e 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1954,16 +1954,46 @@ void check_null_seg_clears_base(struct cpuinfo_x86 *c)
 	set_cpu_bug(c, X86_BUG_NULL_SEG);
 }
 
-static void generic_identify(struct cpuinfo_x86 *c)
+static void init_cpu_info(struct cpuinfo_x86 *c)
 {
+	c->x86_cache_size = 0;
+	c->x86_vendor = X86_VENDOR_UNKNOWN;
+	c->x86_model = c->x86_stepping = 0;	/* So far unknown... */
+	c->x86_vendor_id[0] = '\0'; /* Unset */
+	c->x86_model_id[0] = '\0';  /* Unset */
+#ifdef CONFIG_X86_64
+	c->x86_clflush_size = 64;
+	c->x86_phys_bits = 36;
+	c->x86_virt_bits = 48;
+#else
+	c->cpuid_level = -1;	/* CPUID not detected */
+	c->x86_clflush_size = 32;
+	c->x86_phys_bits = 32;
+	c->x86_virt_bits = 32;
+#endif
+	c->x86_cache_alignment = c->x86_clflush_size;
+	memset(&c->x86_capability, 0, sizeof(c->x86_capability));
+	memset(&c->cpuid, 0, sizeof(c->cpuid));
+#ifdef CONFIG_X86_VMX_FEATURE_NAMES
+	memset(&c->vmx_capability, 0, sizeof(c->vmx_capability));
+#endif
 	c->extended_cpuid_level = 0;
+}
+
+static void identify_cpu(struct cpuinfo_x86 *c)
+{
+	int i;
+
+	c->loops_per_jiffy = loops_per_jiffy;
+
+	init_cpu_info(c);
 
 	if (!cpuid_feature())
 		identify_cpu_without_cpuid(c);
 
-	/* cyrix could have cpuid enabled via c_identify()*/
+	/* cyrix could have cpuid enabled via c_identify() */
 	if (!cpuid_feature())
-		return;
+		goto no_cpuid;
 
 	cpuid_scan_cpu(c);
 	cpu_detect(c);
@@ -1991,43 +2021,8 @@ static void generic_identify(struct cpuinfo_x86 *c)
 #ifdef CONFIG_X86_32
 	set_cpu_bug(c, X86_BUG_ESPFIX);
 #endif
-}
-
-static void init_cpu_info(struct cpuinfo_x86 *c)
-{
-	c->x86_cache_size = 0;
-	c->x86_vendor = X86_VENDOR_UNKNOWN;
-	c->x86_model = c->x86_stepping = 0;	/* So far unknown... */
-	c->x86_vendor_id[0] = '\0'; /* Unset */
-	c->x86_model_id[0] = '\0';  /* Unset */
-#ifdef CONFIG_X86_64
-	c->x86_clflush_size = 64;
-	c->x86_phys_bits = 36;
-	c->x86_virt_bits = 48;
-#else
-	c->cpuid_level = -1;	/* CPUID not detected */
-	c->x86_clflush_size = 32;
-	c->x86_phys_bits = 32;
-	c->x86_virt_bits = 32;
-#endif
-	c->x86_cache_alignment = c->x86_clflush_size;
-	memset(&c->x86_capability, 0, sizeof(c->x86_capability));
-	memset(&c->cpuid, 0, sizeof(c->cpuid));
-#ifdef CONFIG_X86_VMX_FEATURE_NAMES
-	memset(&c->vmx_capability, 0, sizeof(c->vmx_capability));
-#endif
-}
-
-static void identify_cpu(struct cpuinfo_x86 *c)
-{
-	int i;
-
-	c->loops_per_jiffy = loops_per_jiffy;
-
-	init_cpu_info(c);
-
-	generic_identify(c);
 
+no_cpuid:
 	cpu_parse_topology(c);
 
 	if (this_cpu->c_identify)
-- 
2.54.0


  parent reply	other threads:[~2026-07-04  0:21 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-07-04  0:20 [PATCH v1 0/5] x86/cpu: Refactor identify_cpu() Ihor Solodrai
2026-07-04  0:20 ` [PATCH v1 1/5] x86/cpu: Factor init_cpu_info() out of identify_cpu() Ihor Solodrai
2026-07-04  0:20 ` Ihor Solodrai [this message]
2026-07-04  0:20 ` [PATCH v1 3/5] x86/cpu: Introduce identify_cpu_32() helper Ihor Solodrai
2026-07-04  0:20 ` [PATCH v1 4/5] x86/cpu: Set X86_BUG_ESPFIX in identify_cpu_32() Ihor Solodrai
2026-07-04  0:20 ` [PATCH v1 5/5] x86/cpu: Don't reset boot CPU cpuinfo in identify_cpu() Ihor Solodrai

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