Patchwork [v2,2/3] powerpc: move checks in pseries_mach_cpu_die()

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Submitter Vaidyanathan Srinivasan
Date March 1, 2010, 12:58 p.m.
Message ID <20100301125816.26066.34262.stgit@drishya.in.ibm.com>
Download mbox | patch
Permalink /patch/46555/
State Accepted
Commit 0212f2602a38e740d5a96aba4cebfc2ebc993ecf
Headers show

Comments

Vaidyanathan Srinivasan - March 1, 2010, 12:58 p.m.
Rearrange condition checks for better code readability and
	prevention of possible race conditions when
	preferred_offline_state can potentially change during the
	execution of pseries_mach_cpu_die().  The patch will make
	pseries_mach_cpu_die() put cpu in one of the consistent states
	and not hit the run over BUG()

Signed-off-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Cc: Gautham R Shenoy <ego@in.ibm.com>
---
 arch/powerpc/platforms/pseries/hotplug-cpu.c |   30 +++++++++++++-------------
 1 files changed, 15 insertions(+), 15 deletions(-)

Patch

diff --git a/arch/powerpc/platforms/pseries/hotplug-cpu.c b/arch/powerpc/platforms/pseries/hotplug-cpu.c
index 9be7af4..39ecb40 100644
--- a/arch/powerpc/platforms/pseries/hotplug-cpu.c
+++ b/arch/powerpc/platforms/pseries/hotplug-cpu.c
@@ -140,25 +140,25 @@  static void pseries_mach_cpu_die(void)
 		if (!get_lppaca()->shared_proc)
 			get_lppaca()->donate_dedicated_cpu = 0;
 		get_lppaca()->idle = 0;
-	}
 
-	if (get_preferred_offline_state(cpu) == CPU_STATE_ONLINE) {
-		unregister_slb_shadow(hwcpu, __pa(get_slb_shadow()));
+		if (get_preferred_offline_state(cpu) == CPU_STATE_ONLINE) {
+			unregister_slb_shadow(hwcpu, __pa(get_slb_shadow()));
 
-		/*
-		 * Call to start_secondary_resume() will not return.
-		 * Kernel stack will be reset and start_secondary()
-		 * will be called to continue the online operation.
-		 */
-		start_secondary_resume();
+			/*
+			 * Call to start_secondary_resume() will not return.
+			 * Kernel stack will be reset and start_secondary()
+			 * will be called to continue the online operation.
+			 */
+			start_secondary_resume();
+		}
+	}
 
-	} else if (get_preferred_offline_state(cpu) == CPU_STATE_OFFLINE) {
+	/* Requested state is CPU_STATE_OFFLINE at this point */
+	WARN_ON(get_preferred_offline_state(cpu) != CPU_STATE_OFFLINE);
 
-		set_cpu_current_state(cpu, CPU_STATE_OFFLINE);
-		unregister_slb_shadow(hard_smp_processor_id(),
-					__pa(get_slb_shadow()));
-		rtas_stop_self();
-	}
+	set_cpu_current_state(cpu, CPU_STATE_OFFLINE);
+	unregister_slb_shadow(hwcpu, __pa(get_slb_shadow()));
+	rtas_stop_self();
 
 	/* Should never get here... */
 	BUG();