linux-kernel - [PATCH] hw-breakpoints: Provide an off-case for counter_arch

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Date:	Fri, 13 Nov 2009 13:16:15 +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: Provide an off-case for counter_arch_bp()

If an arch doesn't support the hw breakpoints, counter_arch_bp() has
no off case to cover the missing breakpoint info structure from the
perf event. The result is a build error in non-x86 configs.

Reported-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Prasad <prasad@...ux.vnet.ibm.com>
---
 include/linux/hw_breakpoint.h |   15 ++++++++++-----
 1 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/include/linux/hw_breakpoint.h b/include/linux/hw_breakpoint.h
index 7eba9b9..18710e0 100644
--- a/include/linux/hw_breakpoint.h
+++ b/include/linux/hw_breakpoint.h
@@ -16,11 +16,6 @@ enum {
 	HW_BREAKPOINT_X = 4,
 };
 
-static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
-{
-	return &bp->hw.info;
-}
-
 static inline unsigned long hw_breakpoint_addr(struct perf_event *bp)
 {
 	return bp->attr.bp_addr;
@@ -83,6 +78,11 @@ extern void release_bp_slot(struct perf_event *bp);
 
 extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
 
+static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
+{
+	return &bp->hw.info;
+}
+
 #else /* !CONFIG_HAVE_HW_BREAKPOINT */
 
 static inline struct perf_event *
@@ -126,6 +126,11 @@ static inline void release_bp_slot(struct perf_event *bp) 		{ }
 
 static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk)	{ }
 
+static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
+{
+	return NULL;
+}
+
 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
 
 #endif /* _LINUX_HW_BREAKPOINT_H */
-- 
1.6.2.3

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