kernel/hw_breakpoint.c: Fix local/global shadowing

If the new percpu tree is combined with the perf events tree
the following new warning triggers:

 kernel/hw_breakpoint.c: In function 'toggle_bp_task_slot':
 kernel/hw_breakpoint.c:151: warning: 'task_bp_pinned' is used uninitialized in this function

Because it's not valid anymore to define a local variable
and a percpu variable (even if it's file scope local) with
the same name.

Rename the local variable to resolve this.

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: K.Prasad <prasad@linux.vnet.ibm.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
LKML-Reference: <200911260701.nAQ71owx016356@imap1.linux-foundation.org>
[ v2: added changelog ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/hw_breakpoint.c b/kernel/hw_breakpoint.c
index dd3fb4a..32e1018 100644 (file)
--- a/kernel/hw_breakpoint.c
+++ b/kernel/hw_breakpoint.c
@@ -121,7 +121,7 @@ static void toggle_bp_task_slot(struct task_struct *tsk, int cpu, bool enable)
        int count = 0;
        struct perf_event *bp;
        struct perf_event_context *ctx = tsk->perf_event_ctxp;
-       unsigned int *task_bp_pinned;
+       unsigned int *tsk_pinned;
        struct list_head *list;
        unsigned long flags;
 
@@ -146,15 +146,15 @@ static void toggle_bp_task_slot(struct task_struct *tsk, int cpu, bool enable)
        if (WARN_ONCE(count < 0, "No breakpoint counter found in the counter list"))
                return;
 
-       task_bp_pinned = per_cpu(task_bp_pinned, cpu);
+       tsk_pinned = per_cpu(task_bp_pinned, cpu);
        if (enable) {
-               task_bp_pinned[count]++;
+               tsk_pinned[count]++;
                if (count > 0)
-                       task_bp_pinned[count-1]--;
+                       tsk_pinned[count-1]--;
        } else {
-               task_bp_pinned[count]--;
+               tsk_pinned[count]--;
                if (count > 0)
-                       task_bp_pinned[count-1]++;
+                       tsk_pinned[count-1]++;
        }
 }