linux-kernel - [PATCH] x86/microcode: move @microcode

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Date:   Fri, 24 Mar 2023 11:47:20 +0000
From:   John Ogness <john.ogness@...utronix.de>
To:     Borislav Petkov <bp@...en8.de>
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] x86/microcode: move @microcode_mutex definition near usage

If CONFIG_MICROCODE_LATE_LOADING is not enabled, the compiler warns:

'microcode_mutex' defined but not used

Since reload_store() is the only function using this mutex, move the
mutex definititon there. Then it is also within the #ifdef block for
CONFIG_MICROCODE_LATE_LOADING.

Signed-off-by: John Ogness <john.ogness@...utronix.de>
---
 arch/x86/kernel/cpu/microcode/core.c | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index 7a329e561354..e7b8f7ad105d 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -49,20 +49,6 @@ bool initrd_gone;
 
 LIST_HEAD(microcode_cache);
 
-/*
- * Synchronization.
- *
- * All non cpu-hotplug-callback call sites use:
- *
- * - microcode_mutex to synchronize with each other;
- * - cpus_read_lock/unlock() to synchronize with
- *   the cpu-hotplug-callback call sites.
- *
- * We guarantee that only a single cpu is being
- * updated at any particular moment of time.
- */
-static DEFINE_MUTEX(microcode_mutex);
-
 struct ucode_cpu_info		ucode_cpu_info[NR_CPUS];
 
 struct cpu_info_ctx {
@@ -465,6 +451,20 @@ static int microcode_reload_late(void)
 	return ret;
 }
 
+/*
+ * Synchronization.
+ *
+ * All non cpu-hotplug-callback call sites use:
+ *
+ * - microcode_mutex to synchronize with each other;
+ * - cpus_read_lock/unlock() to synchronize with
+ *   the cpu-hotplug-callback call sites.
+ *
+ * We guarantee that only a single cpu is being
+ * updated at any particular moment of time.
+ */
+static DEFINE_MUTEX(microcode_mutex);
+
 static ssize_t reload_store(struct device *dev,
 			    struct device_attribute *attr,
 			    const char *buf, size_t size)

base-commit: 1e760fa3596e8c7f08412712c168288b79670d78
-- 
2.30.2