linux-kernel - [PATCH] kernel/signal.c: Export symbol __lock_task

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Date:   Sun, 21 Jun 2020 16:37:04 +0300
From:   Alexander Kapshuk <alexander.kapshuk@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     christian.brauner@...ntu.com, oleg@...hat.com,
        ebiederm@...ssion.com, akpm@...ux-foundation.org,
        liuzhiqiang26@...wei.com, joel@...lfernandes.org,
        paulmck@...ux.vnet.ibm.com, asmadeus@...ewreck.org,
        alexander.kapshuk@...il.com, kernel test robot <lkp@...el.com>
Subject: [PATCH] kernel/signal.c: Export symbol __lock_task_sighand

Export symbol __lock_task_sighand, so it is accessible from code compiled
as modules.
This fixes the following modpost error:
ERROR: modpost: "__lock_task_sighand" [net/9p/9pnet.ko] undefined!

Where __lock_task_sighand is called via lock_task_sighand in net/9p/client.c
See https://lore.kernel.org/lkml/20200620201456.14304-1-alexander.kapshuk@gmail.com/.

Signed-off-by: Alexander Kapshuk <alexander.kapshuk@...il.com>
Reported-by: kernel test robot <lkp@...el.com>
Link: https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org/thread/TMTLPYU6A522JH2VCN3PNZVAP6EE5MDF/
---
 kernel/signal.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/signal.c b/kernel/signal.c
index 5ca48cc5da76..2612b9098cbd 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1396,6 +1396,7 @@ struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,

 	return sighand;
 }
+EXPORT_SYMBOL(__lock_task_sighand);

 /*
  * send signal info to all the members of a group
--
2.27.0