[PATCH RFC POC 19/50] file: require the syscall exit hook from every architecture

[Christian Brauner]

Every architecture now either uses the generic entry code or provides
TIF_FD_SLOTS. The fallback that deferred without ever committing
can go. Make it a build error instead. A new architecture can't grow
fd_prepare() callers without the syscall exit hook.

Signed-off-by: Christian Brauner (Amutable) <brauner at kernel.org>
---
 fs/file.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/fs/file.c b/fs/file.c
index 6fa481d63dcf..2b041b45f225 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -652,9 +652,7 @@ static void fd_release(unsigned int fd)
 #define fd_slots_set_work()	set_thread_flag(TIF_FD_SLOTS)
 #define fd_slots_clear_work()	clear_thread_flag(TIF_FD_SLOTS)
 #else
-/* Nothing commits until the architecture provides the flag. */
-#define fd_slots_set_work()	do { } while (0)
-#define fd_slots_clear_work()	do { } while (0)
+#error "the syscall exit path must commit prepared file descriptors"
 #endif
 
 static struct fd_slot *fd_slot(struct fd_slots *slots, unsigned int idx)

-- 
2.53.0