Merge tag 'ras_core_for_v6.11_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull RAS updates from Borislav Petkov:

 - A cleanup and a correction to the error injection driver to inject a
   MCA_MISC value only when one has actually been supplied by the user

* tag 'ras_core_for_v6.11_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/mce: Remove unused variable and return value in machine_check_poll()
  x86/mce/inject: Only write MCA_MISC when a value has been supplied

Author: torvalds

arch/x86/include/asm/mce.h

@@ -261,7 +261,8 @@ enum mcp_flags {
 	MCP_DONTLOG	= BIT(2),	/* only clear, don't log */
 	MCP_QUEUE_LOG	= BIT(3),	/* only queue to genpool */
 };
-bool machine_check_poll(enum mcp_flags flags, mce_banks_t *b);
+
+void machine_check_poll(enum mcp_flags flags, mce_banks_t *b);
 
 int mce_notify_irq(void);
 

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

@@ -677,10 +677,9 @@ DEFINE_PER_CPU(unsigned, mce_poll_count);
  * is already totally * confused. In this case it's likely it will
  * not fully execute the machine check handler either.
  */
-bool machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
+void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
 {
 	struct mce_bank *mce_banks = this_cpu_ptr(mce_banks_array);
-	bool error_seen = false;
 	struct mce m;
 	int i;
 
@@ -754,8 +753,6 @@ bool machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
 		continue;
 
 log_it:
-		error_seen = true;
-
 		if (flags & MCP_DONTLOG)
 			goto clear_it;
 
@@ -787,8 +784,6 @@ bool machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
 	 */
 
 	sync_core();
-
-	return error_seen;
 }
 EXPORT_SYMBOL_GPL(machine_check_poll);
 

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

@@ -487,12 +487,16 @@ static void prepare_msrs(void *info)
 			wrmsrl(MSR_AMD64_SMCA_MCx_ADDR(b), m.addr);
 		}
 
-		wrmsrl(MSR_AMD64_SMCA_MCx_MISC(b), m.misc);
 		wrmsrl(MSR_AMD64_SMCA_MCx_SYND(b), m.synd);
+
+		if (m.misc)
+			wrmsrl(MSR_AMD64_SMCA_MCx_MISC(b), m.misc);
 	} else {
 		wrmsrl(MSR_IA32_MCx_STATUS(b), m.status);
 		wrmsrl(MSR_IA32_MCx_ADDR(b), m.addr);
-		wrmsrl(MSR_IA32_MCx_MISC(b), m.misc);
+
+		if (m.misc)
+			wrmsrl(MSR_IA32_MCx_MISC(b), m.misc);
 	}
 }