linux-kernel - [PATCH] hw-breakpoints: Handle bad modify_user_hw

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Date:	Fri, 11 Dec 2009 11:58:42 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Prasad <prasad@...ux.vnet.ibm.com>
Subject: [PATCH] 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.

Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Prasad <prasad@...ux.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,
-- 
1.6.2.3

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