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platform_kernel-5.15
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ftrace: perform an initialization for ftrace to enable it 

Impact: corrects a bug which made the non-dyn function tracer not functional

With latest git, the non-dynamic function tracer didn't get any trace.

The problem was the fact that ftrace_enabled wasn't initialized to 1
because ftrace hasn't any init function when DYNAMIC_FTRACE is disabled.

So when a tracer tries to register an ftrace_ops struct,
__register_ftrace_function failed to set the hook.

This patch corrects it by setting an init function to initialize
ftrace during the boot.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Frederic Weisbecker 2008-10-28 20:17:38 +01:00 committed by Ingo Molnar
parent e946217e4f
commit 0b6e4d56bf
1 changed files with 8 additions and 0 deletions
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8
kernel/trace/ftrace.c
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@ -1339,6 +1339,14 @@ void __init ftrace_init(void)
} }
#else #else
static int __init ftrace_nodyn_init(void)
{
ftrace_enabled = 1;
return 0;
}
device_initcall(ftrace_nodyn_init);
# define ftrace_startup() do { } while (0) # define ftrace_startup() do { } while (0)
# define ftrace_shutdown() do { } while (0) # define ftrace_shutdown() do { } while (0)
# define ftrace_startup_sysctl() do { } while (0) # define ftrace_startup_sysctl() do { } while (0)