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| author |   Arnd Bergmann <arnd@arndb.de> | 2016-06-13 15:04:56 +0200 |
|---|---|---|
| committer |   Ilya Dryomov <idryomov@gmail.com> | 2016-07-28 15:32:53 +0200 |
| commit | a0f2b65275413b3438e9f55b1427273cd893c3b2 (patch) | |
| tree | de350a7a426aa96faeaabfaeb19236a81e72d0e5 /include/linux/ceph/libceph.h | |
| parent | ceph: Correctly return NXIO errors from ceph_llseek (diff) | |
| download | wireguard-linux-a0f2b65275413b3438e9f55b1427273cd893c3b2.tar.xz wireguard-linux-a0f2b65275413b3438e9f55b1427273cd893c3b2.zip | |
ceph: fix symbol versioning for ceph_monc_do_statfs
The genksyms helper in the kernel cannot parse a type definition
like "typeof(((type *)0)->keyfld)" that is used in the DEFINE_RB_FUNCS
helper, causing the following EXPORT_SYMBOL() statement to be ignored
when computing the crcs, and triggering a warning about this:
WARNING: "ceph_monc_do_statfs" [fs/ceph/ceph.ko] has no CRC
To work around the problem, we can rewrite the type to reference
an undefined 'extern' symbol instead of a NULL pointer. This is
evidently ok for genksyms, and it no longer complains about the
line when calling it with 'genksyms -w'.
I've looked briefly into extending genksyms instead, but it seems
really hard to do. Jan Beulich introduced basic support for 'typeof'
a while ago in dc53324060f3 ("genksyms: fix typeof() handling"),
but that is not sufficient for the expression we have here.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: fcd00b68bbe2 ("libceph: DEFINE_RB_FUNCS macro")
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Michal Marek <mmarek@suse.cz>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'include/linux/ceph/libceph.h')
| -rw-r--r-- | include/linux/ceph/libceph.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/ceph/libceph.h b/include/linux/ceph/libceph.h index 6afc5d98fad1..83fc1fff7061 100644 --- a/include/linux/ceph/libceph.h +++ b/include/linux/ceph/libceph.h @@ -215,8 +215,9 @@ static void erase_##name(struct rb_root *root, type *t) \ } #define DEFINE_RB_LOOKUP_FUNC(name, type, keyfld, nodefld) \ +extern type __lookup_##name##_key; \ static type *lookup_##name(struct rb_root *root, \ - typeof(((type *)0)->keyfld) key) \ + typeof(__lookup_##name##_key.keyfld) key) \ { \ struct rb_node *n = root->rb_node; \ \ |