Linux v3.16-rc3-62-gd92a333a65a1
- Add patch to fix virt_blk oops (rhbz 1113805)
This commit is contained in:
Josh Boyer
parent
61a9efe5cc
commit
ccf8f201f8
12
kernel.spec
12
kernel.spec
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@ -69,7 +69,7 @@ Summary: The Linux kernel
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# The rc snapshot level
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%define rcrev 3
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# The git snapshot level
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%define gitrev 1
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%define gitrev 2
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# Set rpm version accordingly
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%define rpmversion 3.%{upstream_sublevel}.0
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%endif
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@ -638,6 +638,9 @@ Patch25109: revert-input-wacom-testing-result-shows-get_report-is-unnecessary.pa
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#rhbz 1021036, submitted upstream
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Patch25110: 0001-ideapad-laptop-Change-Lenovo-Yoga-2-series-rfkill-ha.patch
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#rhbz 1113805
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Patch25111: kernfs-kernfs_notify-must-be-usable-from-non-sleepable-contexts.patch
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# git clone ssh://git.fedorahosted.org/git/kernel-arm64.git, git diff master...devel
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Patch30000: kernel-arm64.patch
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@ -1362,6 +1365,9 @@ ApplyPatch revert-input-wacom-testing-result-shows-get_report-is-unnecessary.pat
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#rhbz 1021036, submitted upstream
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ApplyPatch 0001-ideapad-laptop-Change-Lenovo-Yoga-2-series-rfkill-ha.patch
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#rhbz 1113805
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ApplyPatch kernfs-kernfs_notify-must-be-usable-from-non-sleepable-contexts.patch
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%if 0%{?aarch64patches}
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ApplyPatch kernel-arm64.patch
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%ifnarch aarch64 # this is stupid, but i want to notice before secondary koji does.
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@ -2241,6 +2247,10 @@ fi
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# ||----w |
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# || ||
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%changelog
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* Wed Jul 02 2014 Josh Boyer <jwboyer@fedoraproject.org> - 3.16.0-0.rc3.git2.1
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- Linux v3.16-rc3-62-gd92a333a65a1
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- Add patch to fix virt_blk oops (rhbz 1113805)
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* Wed Jul 02 2014 Kyle McMartin <kyle@fedoraproject.org>
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- arm64: build-in ahci, ethernet, and rtc drivers.
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@ -0,0 +1,262 @@
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Bugzilla: 1113805
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Upstream-status: queued for 3.16
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Sender: Tejun Heo <htejun@gmail.com>
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Date: Tue, 1 Jul 2014 16:41:03 -0400
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From: Tejun Heo <tj@kernel.org>
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To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Cc: Jens Axboe <axboe@kernel.dk>, "Michael S. Tsirkin" <mst@redhat.com>,
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Christoph Hellwig <hch@lst.de>, Josh Boyer <jwboyer@fedoraproject.org>,
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Rusty Russell <rusty@rustcorp.com.au>,
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virtualization@lists.linux-foundation.org,
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"Linux-Kernel@Vger. Kernel. Org" <linux-kernel@vger.kernel.org>,
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Brian Lane <bcl@redhat.com>, John McCutchan <john@johnmccutchan.com>,
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Robert Love <rlove@rlove.org>, Eric Paris <eparis@parisplace.org>
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Subject: [PATCH driver-core-linus] kernfs: kernfs_notify() must be useable
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from non-sleepable contexts
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Message-ID: <20140701204103.GA12459@htj.dyndns.org>
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References: <CA+5PVA4h2hQJLrAm4eEZ8oUgGiAjq2y5eAyBcJWxK_FiQXnuQg@mail.gmail.com>
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<20140629082637.GA23942@redhat.com>
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<20140629193222.GA7030@lst.de>
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<20140629204710.GB11100@redhat.com>
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<53B07D48.60003@kernel.dk>
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<20140630201741.GA20853@htj.dyndns.org>
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X-Scanned-By: MIMEDefang 2.68 on 10.5.110.16
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d911d9874801 ("kernfs: make kernfs_notify() trigger inotify events
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too") added fsnotify triggering to kernfs_notify() which requires a
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sleepable context. There are already existing users of
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kernfs_notify() which invoke it from an atomic context and in general
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it's silly to require a sleepable context for triggering a
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notification.
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The following is an invalid context bug triggerd by md invoking
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sysfs_notify() from IO completion path.
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BUG: sleeping function called from invalid context at kernel/locking/mutex.c:586
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in_atomic(): 1, irqs_disabled(): 1, pid: 0, name: swapper/1
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2 locks held by swapper/1/0:
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#0: (&(&vblk->vq_lock)->rlock){-.-...}, at: [<ffffffffa0039042>] virtblk_done+0x42/0xe0 [virtio_blk]
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#1: (&(&bitmap->counts.lock)->rlock){-.....}, at: [<ffffffff81633718>] bitmap_endwrite+0x68/0x240
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irq event stamp: 33518
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hardirqs last enabled at (33515): [<ffffffff8102544f>] default_idle+0x1f/0x230
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hardirqs last disabled at (33516): [<ffffffff818122ed>] common_interrupt+0x6d/0x72
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softirqs last enabled at (33518): [<ffffffff810a1272>] _local_bh_enable+0x22/0x50
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softirqs last disabled at (33517): [<ffffffff810a29e0>] irq_enter+0x60/0x80
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CPU: 1 PID: 0 Comm: swapper/1 Not tainted 3.16.0-0.rc2.git2.1.fc21.x86_64 #1
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Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
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0000000000000000 f90db13964f4ee05 ffff88007d403b80 ffffffff81807b4c
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0000000000000000 ffff88007d403ba8 ffffffff810d4f14 0000000000000000
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0000000000441800 ffff880078fa1780 ffff88007d403c38 ffffffff8180caf2
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Call Trace:
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<IRQ> [<ffffffff81807b4c>] dump_stack+0x4d/0x66
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[<ffffffff810d4f14>] __might_sleep+0x184/0x240
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[<ffffffff8180caf2>] mutex_lock_nested+0x42/0x440
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[<ffffffff812d76a0>] kernfs_notify+0x90/0x150
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[<ffffffff8163377c>] bitmap_endwrite+0xcc/0x240
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[<ffffffffa00de863>] close_write+0x93/0xb0 [raid1]
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[<ffffffffa00df029>] r1_bio_write_done+0x29/0x50 [raid1]
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[<ffffffffa00e0474>] raid1_end_write_request+0xe4/0x260 [raid1]
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[<ffffffff813acb8b>] bio_endio+0x6b/0xa0
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[<ffffffff813b46c4>] blk_update_request+0x94/0x420
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[<ffffffff813bf0ea>] blk_mq_end_io+0x1a/0x70
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[<ffffffffa00392c2>] virtblk_request_done+0x32/0x80 [virtio_blk]
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[<ffffffff813c0648>] __blk_mq_complete_request+0x88/0x120
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[<ffffffff813c070a>] blk_mq_complete_request+0x2a/0x30
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[<ffffffffa0039066>] virtblk_done+0x66/0xe0 [virtio_blk]
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[<ffffffffa002535a>] vring_interrupt+0x3a/0xa0 [virtio_ring]
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[<ffffffff81116177>] handle_irq_event_percpu+0x77/0x340
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[<ffffffff8111647d>] handle_irq_event+0x3d/0x60
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[<ffffffff81119436>] handle_edge_irq+0x66/0x130
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[<ffffffff8101c3e4>] handle_irq+0x84/0x150
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[<ffffffff818146ad>] do_IRQ+0x4d/0xe0
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[<ffffffff818122f2>] common_interrupt+0x72/0x72
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<EOI> [<ffffffff8105f706>] ? native_safe_halt+0x6/0x10
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[<ffffffff81025454>] default_idle+0x24/0x230
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[<ffffffff81025f9f>] arch_cpu_idle+0xf/0x20
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[<ffffffff810f5adc>] cpu_startup_entry+0x37c/0x7b0
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[<ffffffff8104df1b>] start_secondary+0x25b/0x300
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This patch fixes it by punting the notification delivery through a
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work item. This ends up adding an extra pointer to kernfs_elem_attr
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enlarging kernfs_node by a pointer, which is not ideal but not a very
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big deal either. If this turns out to be an actual issue, we can move
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kernfs_elem_attr->size to kernfs_node->iattr later.
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Signed-off-by: Tejun Heo <tj@kernel.org>
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Reported-by: Josh Boyer <jwboyer@fedoraproject.org>
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Cc: "Michael S. Tsirkin" <mst@redhat.com>
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Cc: Jens Axboe <axboe@kernel.dk>
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---
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fs/kernfs/file.c | 69 +++++++++++++++++++++++++++++++++++++++----------
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include/linux/kernfs.h | 1
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2 files changed, 56 insertions(+), 14 deletions(-)
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--- a/fs/kernfs/file.c
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+++ b/fs/kernfs/file.c
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@@ -39,6 +39,19 @@ struct kernfs_open_node {
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struct list_head files; /* goes through kernfs_open_file.list */
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};
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+/*
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+ * kernfs_notify() may be called from any context and bounces notifications
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+ * through a work item. To minimize space overhead in kernfs_node, the
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+ * pending queue is implemented as a singly linked list of kernfs_nodes.
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+ * The list is terminated with the self pointer so that whether a
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+ * kernfs_node is on the list or not can be determined by testing the next
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+ * pointer for NULL.
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+ */
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+#define KERNFS_NOTIFY_EOL ((void *)&kernfs_notify_list)
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+
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+static DEFINE_SPINLOCK(kernfs_notify_lock);
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+static struct kernfs_node *kernfs_notify_list = KERNFS_NOTIFY_EOL;
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+
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static struct kernfs_open_file *kernfs_of(struct file *file)
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{
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return ((struct seq_file *)file->private_data)->private;
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@@ -783,24 +796,25 @@ static unsigned int kernfs_fop_poll(stru
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return DEFAULT_POLLMASK|POLLERR|POLLPRI;
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}
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-/**
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- * kernfs_notify - notify a kernfs file
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- * @kn: file to notify
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- *
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- * Notify @kn such that poll(2) on @kn wakes up.
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- */
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-void kernfs_notify(struct kernfs_node *kn)
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+static void kernfs_notify_workfn(struct work_struct *work)
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{
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- struct kernfs_root *root = kernfs_root(kn);
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+ struct kernfs_node *kn;
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struct kernfs_open_node *on;
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struct kernfs_super_info *info;
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- unsigned long flags;
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-
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- if (WARN_ON(kernfs_type(kn) != KERNFS_FILE))
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+repeat:
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+ /* pop one off the notify_list */
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+ spin_lock_irq(&kernfs_notify_lock);
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+ kn = kernfs_notify_list;
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+ if (kn == KERNFS_NOTIFY_EOL) {
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+ spin_unlock_irq(&kernfs_notify_lock);
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return;
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+ }
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+ kernfs_notify_list = kn->attr.notify_next;
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+ kn->attr.notify_next = NULL;
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+ spin_unlock_irq(&kernfs_notify_lock);
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/* kick poll */
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- spin_lock_irqsave(&kernfs_open_node_lock, flags);
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+ spin_lock_irq(&kernfs_open_node_lock);
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on = kn->attr.open;
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if (on) {
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@@ -808,12 +822,12 @@ void kernfs_notify(struct kernfs_node *k
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wake_up_interruptible(&on->poll);
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}
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- spin_unlock_irqrestore(&kernfs_open_node_lock, flags);
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+ spin_unlock_irq(&kernfs_open_node_lock);
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/* kick fsnotify */
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mutex_lock(&kernfs_mutex);
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- list_for_each_entry(info, &root->supers, node) {
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+ list_for_each_entry(info, &kernfs_root(kn)->supers, node) {
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struct inode *inode;
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struct dentry *dentry;
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@@ -833,6 +847,33 @@ void kernfs_notify(struct kernfs_node *k
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}
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mutex_unlock(&kernfs_mutex);
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+ kernfs_put(kn);
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+ goto repeat;
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+}
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+
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+/**
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+ * kernfs_notify - notify a kernfs file
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+ * @kn: file to notify
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+ *
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+ * Notify @kn such that poll(2) on @kn wakes up. Maybe be called from any
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+ * context.
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+ */
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+void kernfs_notify(struct kernfs_node *kn)
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+{
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+ static DECLARE_WORK(kernfs_notify_work, kernfs_notify_workfn);
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+ unsigned long flags;
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+
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+ if (WARN_ON(kernfs_type(kn) != KERNFS_FILE))
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+ return;
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+
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+ spin_lock_irqsave(&kernfs_notify_lock, flags);
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+ if (!kn->attr.notify_next) {
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+ kernfs_get(kn);
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+ kn->attr.notify_next = kernfs_notify_list;
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+ kernfs_notify_list = kn;
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+ schedule_work(&kernfs_notify_work);
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+ }
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+ spin_unlock_irqrestore(&kernfs_notify_lock, flags);
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}
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EXPORT_SYMBOL_GPL(kernfs_notify);
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--- a/include/linux/kernfs.h
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+++ b/include/linux/kernfs.h
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@@ -91,6 +91,7 @@ struct kernfs_elem_attr {
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const struct kernfs_ops *ops;
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struct kernfs_open_node *open;
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loff_t size;
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+ struct kernfs_node *notify_next; /* for kernfs_notify() */
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};
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/*
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2
sources
2
sources
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@ -1,4 +1,4 @@
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97ca1625bb40368dc41b9a7971549071 linux-3.15.tar.xz
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ef8f4db937f521a7e323ec589536ba25 perf-man-3.15.tar.gz
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423d8cf28277a385276146c990d029e8 patch-3.16-rc3.xz
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7427a491180a3a85883652ebd6500fc5 patch-3.16-rc3-git1.xz
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436a44358b6011f5a85a1c8391603bde patch-3.16-rc3-git2.xz
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