commit e2b371f00a6f529f6362654239bdec8dcd510760
author Markus Metzger <markus.t.metzger@intel.com> Fri Apr 03 16:43:35 2009 +0200
committer Ingo Molnar <mingo@elte.hu> Tue Apr 07 13:36:13 2009 +0200
tree 36e47cd9fb949fd72893c2d5ddab489fa55b1869
parent a26b89f05d194413c7238e0bea071054f6b5d3c8

mm, x86, ptrace, bts: defer branch trace stopping

When a ptraced task is unlinked, we need to stop branch tracing for
that task.

Since the unlink is called with interrupts disabled, and we need
interrupts enabled to stop branch tracing, we defer the work.

Collect all branch tracing related stuff in a branch tracing context.

Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: roland@redhat.com
Cc: eranian@googlemail.com
Cc: juan.villacis@intel.com
Cc: ak@linux.jf.intel.com
LKML-Reference: <20090403144550.712401000@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

mm/mlock.c

diff --git a/mm/mlock.c b/mm/mlock.c
index cbe9e05..749383b 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -660,21 +660,20 @@
 	return buffer;
 }
 
-void release_locked_buffer(void *buffer, size_t size)
+void refund_locked_buffer_memory(struct mm_struct *mm, size_t size)
 {
 	unsigned long pgsz = PAGE_ALIGN(size) >> PAGE_SHIFT;
 
-	down_write(&current->mm->mmap_sem);
+	down_write(&mm->mmap_sem);
 
-	current->mm->total_vm  -= pgsz;
-	current->mm->locked_vm -= pgsz;
+	mm->total_vm  -= pgsz;
+	mm->locked_vm -= pgsz;
 
-	up_write(&current->mm->mmap_sem);
+	up_write(&mm->mmap_sem);
 }
 
 void free_locked_buffer(void *buffer, size_t size)
 {
-	release_locked_buffer(buffer, size);
-
+	refund_locked_buffer_memory(current->mm, size);
 	kfree(buffer);
 }