Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 7515bf59 authored by Hendrik Brueckner's avatar Hendrik Brueckner Committed by Frederic Weisbecker
Browse files

tracing: Add syscall tracepoints - s390 arch update 



This patch includes s390 arch updates to synchronize with latest
core changes in the syscalls tracing area.

- tracing: Map syscall name to number (syscall_name_to_nr())
- tracing: Call arch_init_ftrace_syscalls at boot
- tracing: add support tracepoint ids (set_syscall_{enter,exit}_id())

Signed-off-by: default avatarHendrik Brueckner <brueckner@linux.vnet.ibm.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Jiaying Zhang <jiayingz@google.com>
Cc: Martin Bligh <mbligh@google.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
LKML-Reference: <20090825123111.GD4639@cetus.boeblingen.de.ibm.com>
Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
parent 35dce1a9

arch/s390/kernel/ftrace.c

+27 −9
Original line number Diff line number Diff line
@@ -220,6 +220,29 @@ 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 < 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_syscall_meta(unsigned long syscall) 
	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