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debugfs: Make debugfs_cancellation a context lock struct

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When compiling include/linux/debugfs.h with CONTEXT_ANALYSIS enabled, we
can see this error:

./include/linux/debugfs.h:239:17: error: use of undeclared identifier 'cancellation'
  239 | void __acquires(cancellation)

Move the __acquires(..) attribute after the declaration, so that the
compiler can see the cancellation function argument, as well as making
struct debugfs_cancellation a real context lock to benefit from Clang's
context analysis.

This change is a preparatory change to allow enabling context analysis
in subsystems that include the above header.

Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Link: https://patch.msgid.link/20251219154418.3592607-22-elver@google.com
This commit is contained in:
Marco Elver 2025-12-19 16:40:10 +01:00 committed by Peter Zijlstra
parent 47907461e4
commit 6e530e2e31
1 changed files with 5 additions and 7 deletions
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12
include/linux/debugfs.h
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@ -239,18 +239,16 @@ ssize_t debugfs_read_file_str(struct file *file, char __user *user_buf,
* @cancel: callback to call
* @cancel_data: extra data for the callback to call
*/
struct debugfs_cancellation {
context_lock_struct(debugfs_cancellation) {
struct list_head list;
void (*cancel)(struct dentry *, void *);
void *cancel_data;
};
void __acquires(cancellation)
debugfs_enter_cancellation(struct file *file,
struct debugfs_cancellation *cancellation);
void __releases(cancellation)
debugfs_leave_cancellation(struct file *file,
struct debugfs_cancellation *cancellation);
void debugfs_enter_cancellation(struct file *file,
struct debugfs_cancellation *cancellation) __acquires(cancellation);
void debugfs_leave_cancellation(struct file *file,
struct debugfs_cancellation *cancellation) __releases(cancellation);
#else