linux-kernel - [PATCH 2/7] add syscall tracepoints

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Date:	Fri, 12 Jun 2009 17:24:44 -0400
From:	Jason Baron <jbaron@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	fweisbec@...il.com, mingo@...e.hu, laijs@...fujitsu.com,
	rostedt@...dmis.org, peterz@...radead.org,
	mathieu.desnoyers@...ymtl.ca, jiayingz@...gle.com,
	bligh@...gle.com, roland@...hat.com, fche@...hat.com
Subject: [PATCH 2/7] add syscall tracepoints


Call arch_init_ftrace_syscalls at boot, so we can determine the set of syscalls
for the syscall trace events.


Signed-off-by: Jason Baron <jbaron@...hat.com>

---
 arch/x86/kernel/ftrace.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index 30baa5b..9f2aa83 100644
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -518,7 +518,7 @@ int syscall_name_to_nr(char *name)
 	return -1;
 }
 
-void arch_init_ftrace_syscalls(void)
+int arch_init_ftrace_syscalls(void)
 {
 	int i;
 	struct syscall_metadata *meta;
@@ -532,17 +532,19 @@ void arch_init_ftrace_syscalls(void)
 					FTRACE_SYSCALL_MAX, GFP_KERNEL);
 	if (!syscalls_metadata) {
 		WARN_ON(1);
-		return;
+		return -ENOMEM;
 	}
 
 	for (i = 0; i < FTRACE_SYSCALL_MAX; i++) {
 		meta = find_syscall_meta(psys_syscall_table[i]);
 		syscalls_metadata[i] = meta;
 	}
-	return;
+	return 0;
 
 	/* Paranoid: avoid overflow */
 end:
 	atomic_dec(&refs);
+	return 0;
 }
+arch_initcall(arch_init_ftrace_syscalls);
 #endif
-- 
1.6.0.6

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