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Subjectlinux-next: build failure after merge of the userns tree
Hi all,

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

In file included from arch/x86/include/asm/bug.h:84,
from include/linux/bug.h:5,
from arch/x86/include/asm/paravirt.h:15,
from arch/x86/include/asm/irqflags.h:63,
from include/linux/irqflags.h:16,
from include/linux/rcupdate.h:26,
from include/linux/rculist.h:11,
from include/linux/pid.h:5,
from include/linux/sched.h:14,
from security/keys/process_keys.c:9:
security/keys/process_keys.c: In function 'key_change_session_keyring':
security/keys/process_keys.c:923:16: error: format '%s' expects a matching 'char *' argument [-Werror=format=]
923 | WARN_ONCE(1, "In %s get_ucounts failed\n");
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/asm-generic/bug.h:99:17: note: in definition of macro '__WARN_printf'
99 | __warn_printk(arg); \
| ^~~
include/linux/once_lite.h:19:4: note: in expansion of macro 'WARN'
19 | func(__VA_ARGS__); \
| ^~~~
include/asm-generic/bug.h:150:2: note: in expansion of macro 'DO_ONCE_LITE_IF'
150 | DO_ONCE_LITE_IF(condition, WARN, 1, format)
| ^~~~~~~~~~~~~~~
security/keys/process_keys.c:923:3: note: in expansion of macro 'WARN_ONCE'
923 | WARN_ONCE(1, "In %s get_ucounts failed\n");
| ^~~~~~~~~
security/keys/process_keys.c:923:21: note: format string is defined here
923 | WARN_ONCE(1, "In %s get_ucounts failed\n");
| ~^
| |
| char *
cc1: all warnings being treated as errors

Caused by commit

346b5b4aa656 ("ucounts: Move get_ucounts from cred_alloc_blank to key_change_session_keyring")

I have used the userns tree from next-20211019 for today.

Stephen Rothwell
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