Commit f50caa9b authored by Arnd Bergmann's avatar Arnd Bergmann Committed by Greg Kroah-Hartman

debugfs: fix debugfs_real_fops() build error

Some drivers use debugfs_real_fops() even when CONFIG_DEBUG_FS is disabled,
which now leads to a build error:

In file included from include/linux/list.h:9:0,
                 from include/linux/wait.h:7,
                 from include/linux/wait_bit.h:8,
                 from include/linux/fs.h:6,
                 from drivers/net/wireless/broadcom/b43legacy/debugfs.c:26:
drivers/net/wireless/broadcom/b43legacy/debugfs.c: In function 'b43legacy_debugfs_read':
drivers/net/wireless/broadcom/b43legacy/debugfs.c:224:23: error: implicit declaration of function 'debugfs_real_fops'; did you mean 'debugfs_create_bool'? [-Werror=implicit-function-declaration]

My first impulse was to add another 'static inline' dummy function
returning NULL for it, which would work fine. However, most callers
feed the pointer into container_of(), so it seems a little dangerous
here. Since all the callers are inside of a read/write file operation
that gets eliminated in this configuration, so having an 'extern'
declaration seems better here. If it ever gets used in a dangerous
way, that will now result in a link error.

Fixes: 7c8d4698 ("debugfs: add support for more elaborate ->d_fsdata")
Cc: Jakub Kicinski <>
Cc: Simon Horman <>
Signed-off-by: default avatarArnd Bergmann <>
Signed-off-by: default avatarGreg Kroah-Hartman <>
parent 4fbd8d19
......@@ -216,6 +216,8 @@ static inline void debugfs_remove(struct dentry *dentry)
static inline void debugfs_remove_recursive(struct dentry *dentry)
{ }
const struct file_operations *debugfs_real_fops(const struct file *filp);
static inline int debugfs_file_get(struct dentry *dentry)
return 0;
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