linux-kernel - [PATCH]: tracing: s390 arch updates for tracing syscalls

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Message-ID: <20090827072738.GA4301@cetus.boeblingen.de.ibm.com>
Date:	Thu, 27 Aug 2009 09:27:39 +0200
From:	Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>,
	Jason Baron <jbaron@...hat.com>, linux-kernel@...r.kernel.org,
	mingo@...e.hu, laijs@...fujitsu.com, rostedt@...dmis.org,
	peterz@...radead.org, mathieu.desnoyers@...ymtl.ca,
	jiayingz@...gle.com, mbligh@...gle.com, lizf@...fujitsu.com,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: [PATCH]: tracing: s390 arch updates for tracing syscalls

On Wed, Aug 26, 2009 at 06:53:25PM +0200, Frederic Weisbecker wrote:
> > Signed-off-by: Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>
> > ---
> >  arch/s390/include/asm/ftrace.h |    4 ++++
> 
> Btw, the stat have changes in ftrace.h but your patch haven't.
> Is there something missing?
No. diffstat has not been refreshed after removing the
FTRACE_SYSCALL_MAX constant.
Here is the patch again with the refreshed diffstat:

Syscall tracing updates for s390 architecture.

This patch includes s390 arch updates for:
- tracing: Map syscall name to number (syscall_name_to_nr())
- tracing: Call arch_init_ftrace_syscalls at boot
- tracing: add support traceopint ids (set_syscall_{enter,exit}_id())
  
Signed-off-by: Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>
---
 arch/s390/kernel/ftrace.c |   36 +++++++++++++++++++++++++++---------
 1 file changed, 27 insertions(+), 9 deletions(-)

--- a/arch/s390/kernel/ftrace.c
+++ b/arch/s390/kernel/ftrace.c
@@ -220,6 +220,29 @@ struct syscall_metadata *syscall_nr_to_m
 	return syscalls_metadata[nr];
 }
 
+int syscall_name_to_nr(char *name)
+{
+	int i;
+
+	if (!syscalls_metadata)
+		return -1;
+	for (i = 0; i < NR_syscalls; i++)
+		if (syscalls_metadata[i])
+			if (!strcmp(syscalls_metadata[i]->name, name))
+				return i;
+	return -1;
+}
+
+void set_syscall_enter_id(int num, int id)
+{
+	syscalls_metadata[num]->enter_id = id;
+}
+
+void set_syscall_exit_id(int num, int id)
+{
+	syscalls_metadata[num]->exit_id = id;
+}
+
 static struct syscall_metadata *find_syscall_meta(unsigned long syscall)
 {
 	struct syscall_metadata *start;
@@ -237,24 +260,19 @@ static struct syscall_metadata *find_sys
 	return NULL;
 }
 
-void arch_init_ftrace_syscalls(void)
+static int __init arch_init_ftrace_syscalls(void)
 {
 	struct syscall_metadata *meta;
 	int i;
-	static atomic_t refs;
-
-	if (atomic_inc_return(&refs) != 1)
-		goto out;
 	syscalls_metadata = kzalloc(sizeof(*syscalls_metadata) * NR_syscalls,
 				    GFP_KERNEL);
 	if (!syscalls_metadata)
-		goto out;
+		return -ENOMEM;
 	for (i = 0; i < NR_syscalls; i++) {
 		meta = find_syscall_meta((unsigned long)sys_call_table[i]);
 		syscalls_metadata[i] = meta;
 	}
-	return;
-out:
-	atomic_dec(&refs);
+	return 0;
 }
+arch_initcall(arch_init_ftrace_syscalls);
 #endif
--
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