sh: ftrace: Fix up syscall tracepoint support.

Sync up 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())

Taken from the s390 change.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

diff --git a/arch/sh/kernel/ftrace.c b/arch/sh/kernel/ftrace.c
index a3dcc6d..2c48e26 100644 (file)
--- a/arch/sh/kernel/ftrace.c
+++ b/arch/sh/kernel/ftrace.c
@@ -291,31 +291,48 @@ struct syscall_metadata *syscall_nr_to_meta(int nr)
        return syscalls_metadata[nr];
 }
 
-void arch_init_ftrace_syscalls(void)
+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 int __init arch_init_ftrace_syscalls(void)
 {
        int i;
        struct syscall_metadata *meta;
        unsigned long **psys_syscall_table = &sys_call_table;
-       static atomic_t refs;
-
-       if (atomic_inc_return(&refs) != 1)
-               goto end;
 
        syscalls_metadata = kzalloc(sizeof(*syscalls_metadata) *
                                        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;
 
-       /* Paranoid: avoid overflow */
-end:
-       atomic_dec(&refs);
+       return 0;
 }
+arch_initcall(arch_init_ftrace_syscalls);
 #endif /* CONFIG_FTRACE_SYSCALLS */