diff mbox series

[V2,06/15] rcuwait: Add @state argument to rcuwait_wait_event()

Message ID 20200318204408.010461877@linutronix.de (mailing list archive)
State Superseded
Headers show
Series Lock ordering documentation and annotation for lockdep | expand

Commit Message

Thomas Gleixner March 18, 2020, 8:43 p.m. UTC 
Extend rcuwait_wait_event() with a state variable so that it is not
restricted to UNINTERRUPTIBLE waits.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
---
 include/linux/rcuwait.h       |   12 ++++++++++--
 kernel/locking/percpu-rwsem.c |    2 +-
 2 files changed, 11 insertions(+), 3 deletions(-)

Comments

Davidlohr Bueso March 20, 2020, 5:36 a.m. UTC | #1 
On Wed, 18 Mar 2020, Thomas Gleixner wrote:

>--- a/include/linux/rcuwait.h
>+++ b/include/linux/rcuwait.h
>@@ -3,6 +3,7 @@
> #define _LINUX_RCUWAIT_H_
>
> #include <linux/rcupdate.h>
>+#include <linux/sched/signal.h>

So this is causing build to fail for me:

  CC      arch/x86/boot/compressed/cmdline.o
arch/x86/boot/compressed/cmdline.c:5:20: error: conflicting types for ‘set_fs’
 static inline void set_fs(unsigned long seg)
                    ^~~~~~
In file included from ./include/linux/uaccess.h:11:0,
                 from ./include/linux/sched/task.h:11,
                 from ./include/linux/sched/signal.h:9,
                 from ./include/linux/rcuwait.h:6,
                 from ./include/linux/percpu-rwsem.h:8,
                 from ./include/linux/fs.h:34,
                 from ./include/linux/proc_fs.h:9,
                 from ./include/acpi/acpi_bus.h:83,
                 from ./include/linux/acpi.h:32,
                 from arch/x86/boot/compressed/misc.h:28,
                 from arch/x86/boot/compressed/cmdline.c:2:
./arch/x86/include/asm/uaccess.h:29:20: note: previous definition of ‘set_fs’ was here
 static inline void set_fs(mm_segment_t fs)
                    ^~~~~~
make[2]: *** [scripts/Makefile.build:268: arch/x86/boot/compressed/cmdline.o] Error 1
make[1]: *** [arch/x86/boot/Makefile:113: arch/x86/boot/compressed/vmlinux] Error 2
make: *** [arch/x86/Makefile:285: bzImage] Error 2

Right now I'm not sure what the proper fix should be.

Thanks,
Davidlohr
Sebastian Andrzej Siewior March 20, 2020, 8:45 a.m. UTC | #2 
On 2020-03-19 22:36:57 [-0700], Davidlohr Bueso wrote:
> On Wed, 18 Mar 2020, Thomas Gleixner wrote:
> 
> Right now I'm not sure what the proper fix should be.

I though that v2 has it fixed with the previous commit (acpi: Remove
header dependency). The kbot just reported that everything is fine.
Let me look…

> Thanks,
> Davidlohr

Sebastian
Davidlohr Bueso March 20, 2020, 8:58 a.m. UTC | #3 
On Fri, 20 Mar 2020, Sebastian Andrzej Siewior wrote:

>I though that v2 has it fixed with the previous commit (acpi: Remove
>header dependency). The kbot just reported that everything is fine.
>Let me look???

Nah my bad, that build did not have the full series applied :)

Sorry for the noise.

Thanks,
Davidlohr
diff mbox series

Patch

--- a/include/linux/rcuwait.h
+++ b/include/linux/rcuwait.h
@@ -3,6 +3,7 @@ 
 #define _LINUX_RCUWAIT_H_
 
 #include <linux/rcupdate.h>
+#include <linux/sched/signal.h>
 
 /*
  * rcuwait provides a way of blocking and waking up a single
@@ -30,23 +31,30 @@  extern void rcuwait_wake_up(struct rcuwa
  * The caller is responsible for locking around rcuwait_wait_event(),
  * such that writes to @task are properly serialized.
  */
-#define rcuwait_wait_event(w, condition)				\
+#define rcuwait_wait_event(w, condition, state)				\
 ({									\
+	int __ret = 0;							\
 	rcu_assign_pointer((w)->task, current);				\
 	for (;;) {							\
 		/*							\
 		 * Implicit barrier (A) pairs with (B) in		\
 		 * rcuwait_wake_up().					\
 		 */							\
-		set_current_state(TASK_UNINTERRUPTIBLE);		\
+		set_current_state(state);				\
 		if (condition)						\
 			break;						\
 									\
+		if (signal_pending_state(state, current)) {		\
+			__ret = -EINTR;					\
+			break;						\
+		}							\
+									\
 		schedule();						\
 	}								\
 									\
 	WRITE_ONCE((w)->task, NULL);					\
 	__set_current_state(TASK_RUNNING);				\
+	__ret;								\
 })
 
 #endif /* _LINUX_RCUWAIT_H_ */
--- a/kernel/locking/percpu-rwsem.c
+++ b/kernel/locking/percpu-rwsem.c
@@ -162,7 +162,7 @@  void percpu_down_write(struct percpu_rw_
 	 */
 
 	/* Wait for all now active readers to complete. */
-	rcuwait_wait_event(&sem->writer, readers_active_check(sem));
+	rcuwait_wait_event(&sem->writer, readers_active_check(sem), TASK_UNINTERRUPTIBLE);
 }
 EXPORT_SYMBOL_GPL(percpu_down_write);