linux-kernel - [PATCH 3.16 52/83] x86/apic: Drop logical_smp_processor

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 20 Nov 2019 15:38:02 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        ebiederm@...ssion.com, andy.shevchenko@...il.com,
        "Dou Liyang" <douly.fnst@...fujitsu.com>,
        "Thomas Gleixner" <tglx@...utronix.de>, bhe@...hat.com
Subject: [PATCH 3.16 52/83] x86/apic: Drop logical_smp_processor_id() inline

3.16.78-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Dou Liyang <douly.fnst@...fujitsu.com>

commit 8f1561680f42a5491b371b513f1ab8197f31fd62 upstream.

The logical_smp_processor_id() inline which is only called in
setup_local_APIC() on x86_32 systems has no real value.

Drop it and directly use GET_APIC_LOGICAL_ID() at the call site and use a
more suitable variable name for readability

Signed-off-by: Dou Liyang <douly.fnst@...fujitsu.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: andy.shevchenko@...il.com
Cc: bhe@...hat.com
Cc: ebiederm@...ssion.com
Link: https://lkml.kernel.org/r/20180301055930.2396-4-douly.fnst@cn.fujitsu.com
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/arch/x86/include/asm/smp.h
+++ b/arch/x86/include/asm/smp.h
@@ -203,16 +203,6 @@ extern int safe_smp_processor_id(void);
 #endif
 
 #ifdef CONFIG_X86_LOCAL_APIC
-
-#ifndef CONFIG_X86_64
-static inline int logical_smp_processor_id(void)
-{
-	/* we don't want to mark this access volatile - bad code generation */
-	return GET_APIC_LOGICAL_ID(apic_read(APIC_LDR));
-}
-
-#endif
-
 extern int hard_smp_processor_id(void);
 
 #else /* CONFIG_X86_LOCAL_APIC */
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -1305,6 +1305,9 @@ void setup_local_APIC(void)
 	int i, j, acked = 0;
 	unsigned long long tsc = 0, ntsc;
 	long long max_loops = cpu_khz ? cpu_khz : 1000000;
+#ifdef CONFIG_X86_32
+	int logical_apicid, ldr_apicid;
+#endif
 
 	if (cpu_has_tsc)
 		rdtscll(tsc);
@@ -1344,11 +1347,11 @@ void setup_local_APIC(void)
 	 * initialized during get_smp_config(), make sure it matches the
 	 * actual value.
 	 */
-	i = early_per_cpu(x86_cpu_to_logical_apicid, cpu);
-	WARN_ON(i != BAD_APICID && i != logical_smp_processor_id());
+	logical_apicid = early_per_cpu(x86_cpu_to_logical_apicid, cpu);
+	ldr_apicid = GET_APIC_LOGICAL_ID(apic_read(APIC_LDR));
+	WARN_ON(logical_apicid != BAD_APICID && logical_apicid != ldr_apicid);
 	/* always use the value from LDR */
-	early_per_cpu(x86_cpu_to_logical_apicid, cpu) =
-		logical_smp_processor_id();
+	early_per_cpu(x86_cpu_to_logical_apicid, cpu) = ldr_apicid;
 
 	/*
 	 * Some NUMA implementations (NUMAQ) don't initialize apicid to