linux-kernel - [PATCH 2/9] uprobes: check for single step support

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Date:	Sun, 14 Oct 2012 21:23:06 +0200
From:	Rabin Vincent <rabin@....in>
To:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>, oleg@...hat.com,
	Rabin Vincent <rabin@....in>
Subject: [PATCH 2/9] uprobes: check for single step support

Check for single step support before calling user_enable_single_step(),
since user_enable_single_step() just BUG()s if support does not exist.
Needed by ARM.

Signed-off-by: Rabin Vincent <rabin@....in>
---
 kernel/events/uprobes.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 98256bc..db4e3ab 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -1450,7 +1450,8 @@ static struct uprobe *find_active_uprobe(unsigned long bp_vaddr, int *is_swbp)
 
 void __weak arch_uprobe_enable_step(struct arch_uprobe *arch)
 {
-	user_enable_single_step(current);
+	if (arch_has_single_step())
+		user_enable_single_step(current);
 }
 
 void __weak arch_uprobe_disable_step(struct arch_uprobe *arch)
-- 
1.7.9.5

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