[tip:perf/urgent] hw-breakpoints: Handle bad modify_user_hw_breakpoint off-case return value

[tip-bot for Frederic Weisbecker <fweisbec@gmail.com>]

Commit-ID:  99ac64c826e62a07e5818cfde620be4d524f1edf
Gitweb:     http://git.kernel.org/tip/99ac64c826e62a07e5818cfde620be4d524f1edf
Author:     Frederic Weisbecker <fweisbec@gmail.com>
AuthorDate: Fri, 11 Dec 2009 11:58:42 +0100
Committer:  Ingo Molnar <mingo@elte.hu>
CommitDate: Fri, 11 Dec 2009 12:03:53 +0100

hw-breakpoints: Handle bad modify_user_hw_breakpoint off-case return value

While converting modify_user_hw_breakpoint() return value, we
forgot to handle the off-case. It's not returning a pointer
anymore.

This solves the build warning reported by Stephen Rothwell against
linux-next.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Prasad <prasad@linux.vnet.ibm.com>
LKML-Reference: <1260529122-6260-1-git-send-regression-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Prasad <prasad@linux.vnet.ibm.com>
---
 include/linux/hw_breakpoint.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/linux/hw_breakpoint.h b/include/linux/hw_breakpoint.h
index 69f07a9..41235c9 100644
--- a/include/linux/hw_breakpoint.h
+++ b/include/linux/hw_breakpoint.h
@@ -93,7 +93,7 @@ register_user_hw_breakpoint(struct perf_event_attr *attr,
 			    struct task_struct *tsk)	{ return NULL; }
 static inline int
 modify_user_hw_breakpoint(struct perf_event *bp,
-			  struct perf_event_attr *attr)	{ return NULL; }
+			  struct perf_event_attr *attr)	{ return -ENOSYS; }
 static inline struct perf_event *
 register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
 				perf_overflow_handler_t	 triggered,