linux-kernel - [PATCH 1/7] V2 add syscall tracepoints

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Message-Id: <d389a88671a791f328c98e79f2110e8af32fd698.1245770664.git.jbaron@redhat.com>
Date:	Tue, 23 Jun 2009 14:28:57 -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,
	mbligh@...gle.com, roland@...hat.com, fche@...hat.com,
	lizf@...fujitsu.com
Subject: [PATCH 1/7] V2 add syscall tracepoints



Add a new function to support translating a syscall name to number at runtime.
This allows the syscall event tracer to map syscall names to number.


Signed-off-by: Jason Baron <jbaron@...hat.com>
Acked-by: Frederic Weisbecker <fweisbec@...il.com>


---
 arch/x86/kernel/ftrace.c |   16 ++++++++++++++++
 1 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index b79c553..b2374db 100644
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -502,6 +502,22 @@ struct syscall_metadata *syscall_nr_to_meta(int nr)
 	return syscalls_metadata[nr];
 }
 
+int syscall_name_to_nr(char *name)
+{
+	int i;
+
+	if (!syscalls_metadata)
+		return -1;
+
+	for (i = 0; i < FTRACE_SYSCALL_MAX; i++) {
+		if (syscalls_metadata[i]) {
+			if (!strcmp(syscalls_metadata[i]->name, name))
+				return i;
+		}
+	}
+	return -1;
+}
+
 void arch_init_ftrace_syscalls(void)
 {
 	int i;
-- 
1.6.0.6

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