linux

Commit Graph

Author	SHA1	Message	Date
Will Deacon	60ca1e5a20	mmiowb: Hook up mmiowb helpers to spinlocks and generic I/O accessors Removing explicit calls to mmiowb() from driver code means that we must now call into the generic mmiowb_spin_{lock,unlock}() functions from the core spinlock code. In order to elide barriers following critical sections without any I/O writes, we also hook into the asm-generic I/O routines. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Will Deacon <will.deacon@arm.com>	2019-04-08 11:59:47 +01:00
Waiman Long	bc88c10d7e	locking/spinlock/debug: Remove spinlock lockup detection code The current spinlock lockup detection code can sometimes produce false positives because of the unfairness of the locking algorithm itself. So the lockup detection code is now removed. Instead, we are relying on the NMI watchdog to detect potential lockup. We won't have lockup detection if the watchdog isn't running. The commented-out read-write lock lockup detection code are also removed. Signed-off-by: Waiman Long <longman@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sasha Levin <sasha.levin@oracle.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1486583208-11038-1-git-send-email-longman@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2017-02-10 09:09:49 +01:00
Peter Zijlstra	60fc28746a	locking: Move the spinlock code to kernel/locking/ Suggested-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/n/tip-b81ol0z3mon45m51o131yc9j@git.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>	2013-11-06 07:55:21 +01:00

Author

SHA1

Message

Date

Will Deacon

60ca1e5a20

mmiowb: Hook up mmiowb helpers to spinlocks and generic I/O accessors

Removing explicit calls to mmiowb() from driver code means that we must
now call into the generic mmiowb_spin_{lock,unlock}() functions from the
core spinlock code. In order to elide barriers following critical
sections without any I/O writes, we also hook into the asm-generic I/O
routines.

Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>

2019-04-08 11:59:47 +01:00

Waiman Long

bc88c10d7e

locking/spinlock/debug: Remove spinlock lockup detection code

The current spinlock lockup detection code can sometimes produce false
positives because of the unfairness of the locking algorithm itself.

So the lockup detection code is now removed. Instead, we are relying
on the NMI watchdog to detect potential lockup. We won't have lockup
detection if the watchdog isn't running.

The commented-out read-write lock lockup detection code are also
removed.

Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1486583208-11038-1-git-send-email-longman@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

2017-02-10 09:09:49 +01:00

Peter Zijlstra

60fc28746a

locking: Move the spinlock code to kernel/locking/

Suggested-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/n/tip-b81ol0z3mon45m51o131yc9j@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

2013-11-06 07:55:21 +01:00

3 Commits