x86/mce: Remove mce_inject_log() in favor of mce_log()

The mutex in mce_inject_log() became unnecessary with commit

  5de97c9f ("x86/mce: Factor out and deprecate the /dev/mcelog driver"),

though the original reason for its presence only vanished with commit

  7298f08e ("x86/mcelog: Get rid of RCU remnants").

Drop the mutex. And as that makes mce_inject_log() identical to mce_log(),
get rid of the former in favor of the latter.
Signed-off-by: Jan H. Schönherr <jschoenh@amazon.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/20191210000733.17979-7-jschoenh@amazon.de

arch/x86/kernel/cpu/mce/core.c

@@ -53,8 +53,6 @@
 
 #include "internal.h"
 
-static DEFINE_MUTEX(mce_log_mutex);
-
 /* sysfs synchronization */
 static DEFINE_MUTEX(mce_sysfs_mutex);
 
@@ -156,14 +154,7 @@ void mce_log(struct mce *m)
 	if (!mce_gen_pool_add(m))
 		irq_work_queue(&mce_irq_work);
 }
-
-void mce_inject_log(struct mce *m)
-{
-	mutex_lock(&mce_log_mutex);
-	mce_log(m);
-	mutex_unlock(&mce_log_mutex);
-}
-EXPORT_SYMBOL_GPL(mce_inject_log);
+EXPORT_SYMBOL_GPL(mce_log);
 
 static struct notifier_block mce_srao_nb;
 

arch/x86/kernel/cpu/mce/inject.c

@@ -494,7 +494,7 @@ static void do_inject(void)
 		i_mce.status |= MCI_STATUS_SYNDV;
 
 	if (inj_type == SW_INJ) {
-		mce_inject_log(&i_mce);
+		mce_log(&i_mce);
 		return;
 	}
 

arch/x86/kernel/cpu/mce/internal.h

@@ -84,8 +84,6 @@ static inline int apei_clear_mce(u64 record_id)
 }
 #endif
 
-void mce_inject_log(struct mce *m);
-
 /*
  * We consider records to be equivalent if bank+status+addr+misc all match.
  * This is only used when the system is going down because of a fatal error