[PATCH] pstore: Make sure CONFIG_PSTORE_PMSG selects CONFIG_RT_MUTEXES

[John Stultz]

In commit 76d62f24db07 ("pstore: Switch pmsg_lock to an rt_mutex
to avoid priority inversion") I changed a lock to an rt_mutex.

However, its possible that CONFIG_RT_MUTEXES is not enabled,
which then results in a build failure, as the 0day bot detected:
  https://lore.kernel.org/linux-mm/202212211244.TwzWZD3H-lkp@xxxxxxxxx/

Thus this patch changes CONFIG_PSTORE_PMSG to select
CONFIG_RT_MUTEXES, which ensures the build will not fail.

Cc: Wei Wang <wvw@xxxxxxxxxx>
Cc: Midas Chien<midaschieh@xxxxxxxxxx>
Cc: Connor O'Brien <connoro@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Anton Vorontsov <anton@xxxxxxxxxx>
Cc: Colin Cross <ccross@xxxxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: kernel test robot <lkp@xxxxxxxxx>
Cc: kernel-team@xxxxxxxxxxx
Fixes: 76d62f24db07 ("pstore: Switch pmsg_lock to an rt_mutex to avoid priority inversion")
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Signed-off-by: John Stultz <jstultz@xxxxxxxxxx>
---
 fs/pstore/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/pstore/Kconfig b/fs/pstore/Kconfig
index 8adabde685f1..c49d554cc9ae 100644
--- a/fs/pstore/Kconfig
+++ b/fs/pstore/Kconfig
@@ -126,6 +126,7 @@ config PSTORE_CONSOLE
 config PSTORE_PMSG
 	bool "Log user space messages"
 	depends on PSTORE
+	select RT_MUTEXES
 	help
 	  When the option is enabled, pstore will export a character
 	  interface /dev/pmsg0 to log user space messages. On reboot
-- 
2.39.0.314.g84b9a713c41-goog