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x86/oprofile: Add counter reservation check for virtual counters

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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@amd.com>
This commit is contained in:
Robert Richter 2009-07-10 18:15:21 +02:00
parent 61d149d524
commit 11be1a7b54
1 changed files with 1 additions and 3 deletions
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4
arch/x86/oprofile/nmi_int.c
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@ -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);