X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=arch%2Fpowerpc%2Foprofile%2Fop_model_fsl_emb.c;h=d4e6507277b5ea6ee43dbc1110027f2c4534eef4;hb=b9da0571050c09863e59f94d0b8594a290d61b88;hp=62312abffa28793561a78f37aaf776bc85526ae1;hpb=c30938d59e7468259855da91a885b19e8044b5f4;p=pandora-kernel.git

diff --git a/arch/powerpc/oprofile/op_model_fsl_emb.c b/arch/powerpc/oprofile/op_model_fsl_emb.c
index 62312abffa28..d4e6507277b5 100644
--- a/arch/powerpc/oprofile/op_model_fsl_emb.c
+++ b/arch/powerpc/oprofile/op_model_fsl_emb.c
@@ -2,7 +2,7 @@
  * Freescale Embedded oprofile support, based on ppc64 oprofile support
  * Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
  *
- * Copyright (c) 2004 Freescale Semiconductor, Inc
+ * Copyright (c) 2004, 2010 Freescale Semiconductor, Inc
  *
  * Author: Andy Fleming
  * Maintainer: Kumar Gala <galak@kernel.crashing.org>
@@ -321,9 +321,6 @@ static void fsl_emb_handle_interrupt(struct pt_regs *regs,
 	int val;
 	int i;
 
-	/* set the PMM bit (see comment below) */
-	mtmsr(mfmsr() | MSR_PMM);
-
 	pc = regs->nip;
 	is_kernel = is_kernel_addr(pc);
 
@@ -340,9 +337,13 @@ static void fsl_emb_handle_interrupt(struct pt_regs *regs,
 	}
 
 	/* The freeze bit was set by the interrupt. */
-	/* Clear the freeze bit, and reenable the interrupt.
-	 * The counters won't actually start until the rfi clears
-	 * the PMM bit */
+	/* Clear the freeze bit, and reenable the interrupt.  The
+	 * counters won't actually start until the rfi clears the PMM
+	 * bit.  The PMM bit should not be set until after the interrupt
+	 * is cleared to avoid it getting lost in some hypervisor
+	 * environments.
+	 */
+	mtmsr(mfmsr() | MSR_PMM);
 	pmc_start_ctrs(1);
 }