linux-next: build failure after merge of the net-next tree

Stephen Rothwell
2023-02-21T01:40:16Z

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Hi all,

After merging the net-next tree, today's linux-next build (x86_64
allmodconfig) failed like this:

In file included from include/linux/notifier.h:14,
from arch/x86/include/asm/uprobes.h:13,
from include/linux/uprobes.h:49,
from include/linux/mm_types.h:16,
from include/linux/buildid.h:5,
from include/linux/module.h:14,
from net/smc/af_smc.c:22:
net/smc/af_smc.c: In function 'smcr_serv_conf_first_link':
net/smc/af_smc.c:1842:20: error: passing argument 1 of 'mutex_lock_nested' from incompatible pointer type [-Werror=incompatible-pointer-types]
1842 | mutex_lock(&link->lgr->llc_conf_mutex);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
| |
| struct rw_semaphore *
include/linux/mutex.h:187:44: note: in definition of macro 'mutex_lock'
187 | #define mutex_lock(lock) mutex_lock_nested(lock, 0)
| ^~~~
include/linux/mutex.h:178:45: note: expected 'struct mutex *' but argument is of type 'struct rw_semaphore *'
178 | extern void mutex_lock_nested(struct mutex *lock, unsigned int subclass);
| ~~~~~~~~~~~~~~^~~~
net/smc/af_smc.c:1845:22: error: passing argument 1 of 'mutex_unlock' from incompatible pointer type [-Werror=incompatible-pointer-types]
1845 | mutex_unlock(&link->lgr->llc_conf_mutex);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
| |
| struct rw_semaphore *
include/linux/mutex.h:218:40: note: expected 'struct mutex *' but argument is of type 'struct rw_semaphore *'
218 | extern void mutex_unlock(struct mutex *lock);
| ~~~~~~~~~~~~~~^~~~

Caused by commit

b5dd4d698171 ("net/smc: llc_conf_mutex refactor, replace it with rw_semaphore")

interacting with commit

e40b801b3603 ("net/smc: fix potential panic dues to unprotected smc_llc_srv_add_link()")

from the net tree.

I applied the following merge resolution patch.

From: Stephen Rothwell <sfr@canb.auug.org.au>
Date: Tue, 21 Feb 2023 12:30:46 +1100
Subject: [PATCH] fix up for "net/smc: llc_conf_mutex refactor, replace it with rw_semaphore"

interacting with "net/smc: fix potential panic dues to unprotected smc_llc_srv_add_link()"

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
---
net/smc/af_smc.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index 0f6a61e44e93..a4cccdfdc00a 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -1839,10 +1839,10 @@ static int smcr_serv_conf_first_link(struct smc_sock *smc)
smc_llc_link_active(link);
smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);

- mutex_lock(&link->lgr->llc_conf_mutex);
+ down_write(&link->lgr->llc_conf_mutex);
/* initial contact - try to establish second link */
smc_llc_srv_add_link(link, NULL);
- mutex_unlock(&link->lgr->llc_conf_mutex);
+ up_write(&link->lgr->llc_conf_mutex);
return 0;
}

--
2.39.1

--
Cheers,
Stephen Rothwell

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