Bart Van Assche 12593b7467 locking/lockdep: Reduce space occupied by stack traces ... Although commit 669de8bda8 ("kernel/workqueue: Use dynamic lockdep keys for workqueues") unregisters dynamic lockdep keys when a workqueue is destroyed, a side effect of that commit is that all stack traces associated with the lockdep key are leaked when a workqueue is destroyed. Fix this by storing each unique stack trace once. Other changes in this patch are: - Use NULL instead of { .nr_entries = 0 } to represent 'no trace'. - Store a pointer to a stack trace in struct lock_class and struct lock_list instead of storing 'nr_entries' and 'offset'. This patch avoids that the following program triggers the "BUG: MAX_STACK_TRACE_ENTRIES too low!" complaint: #include <fcntl.h> #include <unistd.h> int main() { for (;;) { int fd = open("/dev/infiniband/rdma_cm", O_RDWR); close(fd); } } Suggested-by: Peter Zijlstra <peterz@infradead.org> Reported-by: Eric Biggers <ebiggers@kernel.org> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Waiman Long <longman@redhat.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Yuyang Du <duyuyang@gmail.com> Link: https://lkml.kernel.org/r/20190722182443.216015-4-bvanassche@acm.org Signed-off-by: Ingo Molnar <mingo@kernel.org>		2019-07-25 15:43:27 +02:00
..
acpi
asm-generic	futex: Cleanup generic SMP variant of arch_futex_atomic_op_inuser()	2019-07-22 11:20:10 +02:00
clocksource
crypto
drm	drm fixes for -rc1:	2019-07-19 12:29:43 -07:00
dt-bindings	ARM: Device-tree updates	2019-07-19 17:19:24 -07:00
keys
kvm
linux	locking/lockdep: Reduce space occupied by stack traces	2019-07-25 15:43:27 +02:00
math-emu
media
misc	powerpc updates for 5.3	2019-07-13 16:08:36 -07:00
net	tcp: fix tcp_set_congestion_control() use from bpf hook	2019-07-18 20:33:48 -07:00
pcmcia
ras
rdma
scsi	SCSI fixes on 20190720	2019-07-20 10:04:58 -07:00
soc	ARM: SoC-related driver updates	2019-07-19 17:13:56 -07:00
sound	ALSA: hda - Don't resume forcibly i915 HDMI/DP codec	2019-07-16 22:46:13 +02:00
target
trace	NFS client updates for Linux 5.3	2019-07-18 14:32:33 -07:00
uapi	drm fixes for -rc1:	2019-07-19 12:29:43 -07:00
vdso
video	drm main pull request for v5.3-rc1 (sans mm changes)	2019-07-15 19:04:27 -07:00
xen	xen: remove tmem driver	2019-07-17 08:09:58 +02:00
Kbuild	kbuild: update compile-test header list for v5.3-rc1	2019-07-20 11:19:29 +09:00