sched/wait: Add <linux/sched/signal.h> dependency for now

The wait_event_interruptible*() APIs are using signal_pending(), so
include its header to not build-break users of those APIs.

Note that this is overkill as most wait_event*() users don't care
about signals - but solving that problem turned out to be more
complex.

Note two dependency quirks:

- the <linux/sched/signal.h> include line needs to be last in
  wait.h, because that header itself depends on wait-queue types.

- we shouldn't include cred.h from sched/signal.h, because cred.h is
  a complex header that will create a circular dependency if we do so.
  Instead we include wait.h to gain the waitqueue types, plus we
  predeclare 'struct cred' for a function prototype.

Note that the cred.h change has some knock-on effects.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/kernel/tsacct.c b/kernel/tsacct.c
index 370724b45391..63834bd86639 100644
--- a/kernel/tsacct.c
+++ b/kernel/tsacct.c
@@ -23,6 +23,7 @@
 #include <linux/tsacct_kern.h>
 #include <linux/acct.h>
 #include <linux/jiffies.h>
+#include <linux/cred.h>
 #include <linux/mm.h>
 
 /*