On Fri, Jul 11, 2014 at 01:38:12PM +0200, Ard Biesheuvel wrote:
> Commit f7f7bac9cb1c ("rcu: Have the RCU tracepoints use the tracepoint_string
> infrastructure") unconditionally populates the __tracepoint_str input section,
> but this section is not assigned an output section if CONFIG_TRACING is not
> set.
> This results in the __tracepoint_str turning up in unexpected places, i.e.,
> after _edata.
>
> Signed-off-by: Ard Biesheuvel <[email protected]>
> Cc: [email protected]
> Cc: [email protected]
> Cc: [email protected]
If you get a Reviewed-by from Steven Rostedt, I will be happy to queue
this one.
Thanx, Paul
> ---
> kernel/rcu/tree.c | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
> index f1ba77363fbb..ac1984149eb5 100644
> --- a/kernel/rcu/tree.c
> +++ b/kernel/rcu/tree.c
> @@ -79,9 +79,16 @@ static struct lock_class_key rcu_fqs_class[RCU_NUM_LVLS];
> * the tracing userspace tools to be able to decipher the string
> * address to the matching string.
> */
> +#ifdef CONFIG_TRACING
> +#define DEFINE_TPS(sname) \
> +static const char *tp_##sname##_varname __used __tracepoint_string =
> sname##_varname;
> +#else
> +#define DEFINE_TPS(sname)
> +#endif
> +
> #define RCU_STATE_INITIALIZER(sname, sabbr, cr) \
> static char sname##_varname[] = #sname; \
> -static const char *tp_##sname##_varname __used __tracepoint_string =
> sname##_varname; \
> +DEFINE_TPS(sname) \
> struct rcu_state sname##_state = { \
> .level = { &sname##_state.node[0] }, \
> .call = cr, \
> --
> 1.8.3.2
>
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