linux-kernel - [PATCH 25/26] x86/oprofile: Add counter reservation check for virtual counters

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Date:	Tue, 28 Jul 2009 19:07:25 +0200
From:	Robert Richter <robert.richter@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	LKML <linux-kernel@...r.kernel.org>,
	oprofile-list <oprofile-list@...ts.sourceforge.net>,
	Robert Richter <robert.richter@....com>
Subject: [PATCH 25/26] x86/oprofile: Add counter reservation check for virtual counters

This patch adds a check for the availability of a counter. A virtual
counter is used only if its physical counter is not reserved.

Signed-off-by: Robert Richter <robert.richter@....com>
---
 arch/x86/oprofile/nmi_int.c |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c
index 5856e61..cb88b1a 100644
--- a/arch/x86/oprofile/nmi_int.c
+++ b/arch/x86/oprofile/nmi_int.c
@@ -435,15 +435,13 @@ static int nmi_create_files(struct super_block *sb, struct dentry *root)
 		struct dentry *dir;
 		char buf[4];
 
-#ifndef CONFIG_OPROFILE_EVENT_MULTIPLEX
 		/* quick little hack to _not_ expose a counter if it is not
 		 * available for use.  This should protect userspace app.
 		 * NOTE:  assumes 1:1 mapping here (that counters are organized
 		 *        sequentially in their struct assignment).
 		 */
-		if (unlikely(!avail_to_resrv_perfctr_nmi_bit(i)))
+		if (!avail_to_resrv_perfctr_nmi_bit(op_x86_virt_to_phys(i)))
 			continue;
-#endif /* CONFIG_OPROFILE_EVENT_MULTIPLEX */
 
 		snprintf(buf,  sizeof(buf), "%d", i);
 		dir = oprofilefs_mkdir(sb, root, buf);
-- 
1.6.3.3


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