[PATCH v2 1/2] trace: select TIMER_EARLY to avoid infinite recursion

[Rick Chen]

> From: Pragnesh Patel [mailto:pragnesh.patel at sifive.com]
> Sent: Tuesday, December 22, 2020 2:23 PM
> To: u-boot at lists.denx.de
> Cc: atish.patra at wdc.com; palmerdabbelt at google.com; bmeng.cn at gmail.com; paul.walmsley at sifive.com; anup.patel at wdc.com; sagar.kadam at sifive.com; Rick Jian-Zhi Chen(陳建志); pragnesh.patel at openfive.com; Pragnesh Patel; Simon Glass; Stefan Roese; Joao Marcos Costa; Reuben Dowle; Weijie Gao; Marcin Juszkiewicz; Michael Walle; Marek Szyprowski; Keerthy
> Subject: [PATCH v2 1/2] trace: select TIMER_EARLY to avoid infinite recursion
>
> When tracing functions is enabled this adds calls to
> __cyg_profile_func_enter() and __cyg_profile_func_exit() to the traced
> functions.
>
> __cyg_profile_func_enter() and __cyg_profile_func_exit() invoke
> timer_get_us() to record the entry and exit time.
>
> initr_dm() will make gd->dm_root = NULL and gd->timer = NULL, so
> timer_get_us() -> get_ticks() -> dm_timer_init() will lead to an
> indefinite recursion.
>
> So select TIMER_EARLY when tracing got enabled.
>
> Signed-off-by: Pragnesh Patel <pragnesh.patel at sifive.com>
> ---
>
> Changes in v2:
> - new patch
>
>  lib/Kconfig | 1 +
>  1 file changed, 1 insertion(+)

Reviewed-by: Rick Chen <rick at andestech.com>