From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Mon, 11 Jul 2016 23:57:08 +0000 (-0700)
Subject: delete queue-3.14/locking-ww_mutex-report-recursive-ww_mutex-locking-early.patch
X-Git-Tag: v4.6.5~33
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=3db20337ad5da5fbadb6594c103ff04d1a500371;p=thirdparty%2Fkernel%2Fstable-queue.git

delete queue-3.14/locking-ww_mutex-report-recursive-ww_mutex-locking-early.patch
---

diff --git a/queue-3.14/locking-ww_mutex-report-recursive-ww_mutex-locking-early.patch b/queue-3.14/locking-ww_mutex-report-recursive-ww_mutex-locking-early.patch
deleted file mode 100644
index 4b697fc494c..00000000000
--- a/queue-3.14/locking-ww_mutex-report-recursive-ww_mutex-locking-early.patch
+++ /dev/null
@@ -1,60 +0,0 @@
-From 0422e83d84ae24b933e4b0d4c1e0f0b4ae8a0a3b Mon Sep 17 00:00:00 2001
-From: Chris Wilson <chris@chris-wilson.co.uk>
-Date: Thu, 26 May 2016 21:08:17 +0100
-Subject: locking/ww_mutex: Report recursive ww_mutex locking early
-
-From: Chris Wilson <chris@chris-wilson.co.uk>
-
-commit 0422e83d84ae24b933e4b0d4c1e0f0b4ae8a0a3b upstream.
-
-Recursive locking for ww_mutexes was originally conceived as an
-exception. However, it is heavily used by the DRM atomic modesetting
-code. Currently, the recursive deadlock is checked after we have queued
-up for a busy-spin and as we never release the lock, we spin until
-kicked, whereupon the deadlock is discovered and reported.
-
-A simple solution for the now common problem is to move the recursive
-deadlock discovery to the first action when taking the ww_mutex.
-
-Suggested-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
-Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
-Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
-Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
-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: Thomas Gleixner <tglx@linutronix.de>
-Link: http://lkml.kernel.org/r/1464293297-19777-1-git-send-email-chris@chris-wilson.co.uk
-Signed-off-by: Ingo Molnar <mingo@kernel.org>
-Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-
----
- kernel/locking/mutex.c |    9 ++++++---
- 1 file changed, 6 insertions(+), 3 deletions(-)
-
---- a/kernel/locking/mutex.c
-+++ b/kernel/locking/mutex.c
-@@ -304,9 +304,6 @@ __mutex_lock_check_stamp(struct mutex *l
- 	if (!hold_ctx)
- 		return 0;
- 
--	if (unlikely(ctx == hold_ctx))
--		return -EALREADY;
--
- 	if (ctx->stamp - hold_ctx->stamp <= LONG_MAX &&
- 	    (ctx->stamp != hold_ctx->stamp || ctx > hold_ctx)) {
- #ifdef CONFIG_DEBUG_MUTEXES
-@@ -417,6 +414,12 @@ __mutex_lock_common(struct mutex *lock,
- 	unsigned long flags;
- 	int ret;
- 
-+	if (use_ww_ctx) {
-+		struct ww_mutex *ww = container_of(lock, struct ww_mutex, base);
-+		if (unlikely(ww_ctx == READ_ONCE(ww->ctx)))
-+			return -EALREADY;
-+	}
-+
- 	preempt_disable();
- 	mutex_acquire_nest(&lock->dep_map, subclass, 0, nest_lock, ip);
- 
diff --git a/queue-3.14/series b/queue-3.14/series
index ad9f3e2e8f6..3f0dea31407 100644
--- a/queue-3.14/series
+++ b/queue-3.14/series
@@ -13,7 +13,6 @@ powerpc-iommu-remove-the-dependency-on-eeh-struct-in-ddw-mechanism.patch
 powerpc-pseries-fix-pci-config-address-for-ddw.patch
 powerpc-tm-always-reclaim-in-start_thread-for-exec-class-syscalls.patch
 usb-ehci-declare-hostpc-register-as-zero-length-array.patch
-locking-ww_mutex-report-recursive-ww_mutex-locking-early.patch
 x86-build-copy-ldlinux.c32-to-image.iso.patch
 kprobes-x86-clear-tf-bit-in-fault-on-single-stepping.patch
 x86-amd_nb-fix-boot-crash-on-non-amd-systems.patch