linux-kernel - [PATCH] pstore: Make sure CONFIG_PSTORE_PMSG selects CONFIG_RT

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Message-ID: <20221221051855.15761-1-jstultz@google.com>
Date:   Wed, 21 Dec 2022 05:18:55 +0000
From:   John Stultz <jstultz@...gle.com>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     John Stultz <jstultz@...gle.com>, Wei Wang <wvw@...gle.com>,
        Midas Chien <midaschieh@...gle.com>,
        "Connor O'Brien" <connoro@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Anton Vorontsov <anton@...msg.org>,
        Colin Cross <ccross@...roid.com>,
        Tony Luck <tony.luck@...el.com>,
        kernel test robot <lkp@...el.com>, kernel-team@...roid.com
Subject: [PATCH] pstore: Make sure CONFIG_PSTORE_PMSG selects CONFIG_RT_MUTEXES

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@intel.com/

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

Cc: Wei Wang <wvw@...gle.com>
Cc: Midas Chien<midaschieh@...gle.com>
Cc: Connor O'Brien <connoro@...gle.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Anton Vorontsov <anton@...msg.org>
Cc: Colin Cross <ccross@...roid.com>
Cc: Tony Luck <tony.luck@...el.com>
Cc: kernel test robot <lkp@...el.com>
Cc: kernel-team@...roid.com
Fixes: 76d62f24db07 ("pstore: Switch pmsg_lock to an rt_mutex to avoid priority inversion")
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: John Stultz <jstultz@...gle.com>
---
 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