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Linux v3.16-rc3-62-gd92a333a65a1

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- Add patch to fix virt_blk oops (rhbz 1113805)
This commit is contained in:
Josh Boyer 2014-07-02 09:33:16 -04:00
parent 61a9efe5cc
commit ccf8f201f8
3 changed files with 274 additions and 2 deletions
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12
kernel.spec
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@ -69,7 +69,7 @@ Summary: The Linux kernel
# The rc snapshot level
%define rcrev 3
# The git snapshot level
%define gitrev 1
%define gitrev 2
# Set rpm version accordingly
%define rpmversion 3.%{upstream_sublevel}.0
%endif
@ -638,6 +638,9 @@ Patch25109: revert-input-wacom-testing-result-shows-get_report-is-unnecessary.pa
#rhbz 1021036, submitted upstream
Patch25110: 0001-ideapad-laptop-Change-Lenovo-Yoga-2-series-rfkill-ha.patch
#rhbz 1113805
Patch25111: kernfs-kernfs_notify-must-be-usable-from-non-sleepable-contexts.patch
# git clone ssh://git.fedorahosted.org/git/kernel-arm64.git, git diff master...devel
Patch30000: kernel-arm64.patch
@ -1362,6 +1365,9 @@ ApplyPatch revert-input-wacom-testing-result-shows-get_report-is-unnecessary.pat
#rhbz 1021036, submitted upstream
ApplyPatch 0001-ideapad-laptop-Change-Lenovo-Yoga-2-series-rfkill-ha.patch
#rhbz 1113805
ApplyPatch kernfs-kernfs_notify-must-be-usable-from-non-sleepable-contexts.patch
%if 0%{?aarch64patches}
ApplyPatch kernel-arm64.patch
%ifnarch aarch64 # this is stupid, but i want to notice before secondary koji does.
@ -2241,6 +2247,10 @@ fi
# ||----w |
# || ||
%changelog
* Wed Jul 02 2014 Josh Boyer <jwboyer@fedoraproject.org> - 3.16.0-0.rc3.git2.1
- Linux v3.16-rc3-62-gd92a333a65a1
- Add patch to fix virt_blk oops (rhbz 1113805)
* Wed Jul 02 2014 Kyle McMartin <kyle@fedoraproject.org>
- arm64: build-in ahci, ethernet, and rtc drivers.

262
kernfs-kernfs_notify-must-be-usable-from-non-sleepable-contexts.patch Normal file
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@ -0,0 +1,262 @@
Bugzilla: 1113805
Upstream-status: queued for 3.16
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Sender: Tejun Heo <htejun@gmail.com>
Date: Tue, 1 Jul 2014 16:41:03 -0400
From: Tejun Heo <tj@kernel.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jens Axboe <axboe@kernel.dk>, "Michael S. Tsirkin" <mst@redhat.com>,
Christoph Hellwig <hch@lst.de>, Josh Boyer <jwboyer@fedoraproject.org>,
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"Linux-Kernel@Vger. Kernel. Org" <linux-kernel@vger.kernel.org>,
Brian Lane <bcl@redhat.com>, John McCutchan <john@johnmccutchan.com>,
Robert Love <rlove@rlove.org>, Eric Paris <eparis@parisplace.org>
Subject: [PATCH driver-core-linus] kernfs: kernfs_notify() must be useable
from non-sleepable contexts
Message-ID: <20140701204103.GA12459@htj.dyndns.org>
References: <CA+5PVA4h2hQJLrAm4eEZ8oUgGiAjq2y5eAyBcJWxK_FiQXnuQg@mail.gmail.com>
<20140629082637.GA23942@redhat.com>
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d911d9874801 ("kernfs: make kernfs_notify() trigger inotify events
too") added fsnotify triggering to kernfs_notify() which requires a
sleepable context. There are already existing users of
kernfs_notify() which invoke it from an atomic context and in general
it's silly to require a sleepable context for triggering a
notification.
The following is an invalid context bug triggerd by md invoking
sysfs_notify() from IO completion path.
BUG: sleeping function called from invalid context at kernel/locking/mutex.c:586
in_atomic(): 1, irqs_disabled(): 1, pid: 0, name: swapper/1
2 locks held by swapper/1/0:
#0: (&(&vblk->vq_lock)->rlock){-.-...}, at: [<ffffffffa0039042>] virtblk_done+0x42/0xe0 [virtio_blk]
#1: (&(&bitmap->counts.lock)->rlock){-.....}, at: [<ffffffff81633718>] bitmap_endwrite+0x68/0x240
irq event stamp: 33518
hardirqs last enabled at (33515): [<ffffffff8102544f>] default_idle+0x1f/0x230
hardirqs last disabled at (33516): [<ffffffff818122ed>] common_interrupt+0x6d/0x72
softirqs last enabled at (33518): [<ffffffff810a1272>] _local_bh_enable+0x22/0x50
softirqs last disabled at (33517): [<ffffffff810a29e0>] irq_enter+0x60/0x80
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 3.16.0-0.rc2.git2.1.fc21.x86_64 #1
Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
0000000000000000 f90db13964f4ee05 ffff88007d403b80 ffffffff81807b4c
0000000000000000 ffff88007d403ba8 ffffffff810d4f14 0000000000000000
0000000000441800 ffff880078fa1780 ffff88007d403c38 ffffffff8180caf2
Call Trace:
<IRQ> [<ffffffff81807b4c>] dump_stack+0x4d/0x66
[<ffffffff810d4f14>] __might_sleep+0x184/0x240
[<ffffffff8180caf2>] mutex_lock_nested+0x42/0x440
[<ffffffff812d76a0>] kernfs_notify+0x90/0x150
[<ffffffff8163377c>] bitmap_endwrite+0xcc/0x240
[<ffffffffa00de863>] close_write+0x93/0xb0 [raid1]
[<ffffffffa00df029>] r1_bio_write_done+0x29/0x50 [raid1]
[<ffffffffa00e0474>] raid1_end_write_request+0xe4/0x260 [raid1]
[<ffffffff813acb8b>] bio_endio+0x6b/0xa0
[<ffffffff813b46c4>] blk_update_request+0x94/0x420
[<ffffffff813bf0ea>] blk_mq_end_io+0x1a/0x70
[<ffffffffa00392c2>] virtblk_request_done+0x32/0x80 [virtio_blk]
[<ffffffff813c0648>] __blk_mq_complete_request+0x88/0x120
[<ffffffff813c070a>] blk_mq_complete_request+0x2a/0x30
[<ffffffffa0039066>] virtblk_done+0x66/0xe0 [virtio_blk]
[<ffffffffa002535a>] vring_interrupt+0x3a/0xa0 [virtio_ring]
[<ffffffff81116177>] handle_irq_event_percpu+0x77/0x340
[<ffffffff8111647d>] handle_irq_event+0x3d/0x60
[<ffffffff81119436>] handle_edge_irq+0x66/0x130
[<ffffffff8101c3e4>] handle_irq+0x84/0x150
[<ffffffff818146ad>] do_IRQ+0x4d/0xe0
[<ffffffff818122f2>] common_interrupt+0x72/0x72
<EOI> [<ffffffff8105f706>] ? native_safe_halt+0x6/0x10
[<ffffffff81025454>] default_idle+0x24/0x230
[<ffffffff81025f9f>] arch_cpu_idle+0xf/0x20
[<ffffffff810f5adc>] cpu_startup_entry+0x37c/0x7b0
[<ffffffff8104df1b>] start_secondary+0x25b/0x300
This patch fixes it by punting the notification delivery through a
work item. This ends up adding an extra pointer to kernfs_elem_attr
enlarging kernfs_node by a pointer, which is not ideal but not a very
big deal either. If this turns out to be an actual issue, we can move
kernfs_elem_attr->size to kernfs_node->iattr later.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Josh Boyer <jwboyer@fedoraproject.org>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
---
fs/kernfs/file.c | 69 +++++++++++++++++++++++++++++++++++++++----------
include/linux/kernfs.h | 1
2 files changed, 56 insertions(+), 14 deletions(-)
--- a/fs/kernfs/file.c
+++ b/fs/kernfs/file.c
@@ -39,6 +39,19 @@ struct kernfs_open_node {
struct list_head files; /* goes through kernfs_open_file.list */
};
+/*
+ * kernfs_notify() may be called from any context and bounces notifications
+ * through a work item. To minimize space overhead in kernfs_node, the
+ * pending queue is implemented as a singly linked list of kernfs_nodes.
+ * The list is terminated with the self pointer so that whether a
+ * kernfs_node is on the list or not can be determined by testing the next
+ * pointer for NULL.
+ */
+#define KERNFS_NOTIFY_EOL ((void *)&kernfs_notify_list)
+
+static DEFINE_SPINLOCK(kernfs_notify_lock);
+static struct kernfs_node *kernfs_notify_list = KERNFS_NOTIFY_EOL;
+
static struct kernfs_open_file *kernfs_of(struct file *file)
{
return ((struct seq_file *)file->private_data)->private;
@@ -783,24 +796,25 @@ static unsigned int kernfs_fop_poll(stru
return DEFAULT_POLLMASK|POLLERR|POLLPRI;
}
-/**
- * kernfs_notify - notify a kernfs file
- * @kn: file to notify
- *
- * Notify @kn such that poll(2) on @kn wakes up.
- */
-void kernfs_notify(struct kernfs_node *kn)
+static void kernfs_notify_workfn(struct work_struct *work)
{
- struct kernfs_root *root = kernfs_root(kn);
+ struct kernfs_node *kn;
struct kernfs_open_node *on;
struct kernfs_super_info *info;
- unsigned long flags;
-
- if (WARN_ON(kernfs_type(kn) != KERNFS_FILE))
+repeat:
+ /* pop one off the notify_list */
+ spin_lock_irq(&kernfs_notify_lock);
+ kn = kernfs_notify_list;
+ if (kn == KERNFS_NOTIFY_EOL) {
+ spin_unlock_irq(&kernfs_notify_lock);
return;
+ }
+ kernfs_notify_list = kn->attr.notify_next;
+ kn->attr.notify_next = NULL;
+ spin_unlock_irq(&kernfs_notify_lock);
/* kick poll */
- spin_lock_irqsave(&kernfs_open_node_lock, flags);
+ spin_lock_irq(&kernfs_open_node_lock);
on = kn->attr.open;
if (on) {
@@ -808,12 +822,12 @@ void kernfs_notify(struct kernfs_node *k
wake_up_interruptible(&on->poll);
}
- spin_unlock_irqrestore(&kernfs_open_node_lock, flags);
+ spin_unlock_irq(&kernfs_open_node_lock);
/* kick fsnotify */
mutex_lock(&kernfs_mutex);
- list_for_each_entry(info, &root->supers, node) {
+ list_for_each_entry(info, &kernfs_root(kn)->supers, node) {
struct inode *inode;
struct dentry *dentry;
@@ -833,6 +847,33 @@ void kernfs_notify(struct kernfs_node *k
}
mutex_unlock(&kernfs_mutex);
+ kernfs_put(kn);
+ goto repeat;
+}
+
+/**
+ * kernfs_notify - notify a kernfs file
+ * @kn: file to notify
+ *
+ * Notify @kn such that poll(2) on @kn wakes up. Maybe be called from any
+ * context.
+ */
+void kernfs_notify(struct kernfs_node *kn)
+{
+ static DECLARE_WORK(kernfs_notify_work, kernfs_notify_workfn);
+ unsigned long flags;
+
+ if (WARN_ON(kernfs_type(kn) != KERNFS_FILE))
+ return;
+
+ spin_lock_irqsave(&kernfs_notify_lock, flags);
+ if (!kn->attr.notify_next) {
+ kernfs_get(kn);
+ kn->attr.notify_next = kernfs_notify_list;
+ kernfs_notify_list = kn;
+ schedule_work(&kernfs_notify_work);
+ }
+ spin_unlock_irqrestore(&kernfs_notify_lock, flags);
}
EXPORT_SYMBOL_GPL(kernfs_notify);
--- a/include/linux/kernfs.h
+++ b/include/linux/kernfs.h
@@ -91,6 +91,7 @@ struct kernfs_elem_attr {
const struct kernfs_ops *ops;
struct kernfs_open_node *open;
loff_t size;
+ struct kernfs_node *notify_next; /* for kernfs_notify() */
};
/*

2
sources
View File

@ -1,4 +1,4 @@
97ca1625bb40368dc41b9a7971549071 linux-3.15.tar.xz
ef8f4db937f521a7e323ec589536ba25 perf-man-3.15.tar.gz
423d8cf28277a385276146c990d029e8 patch-3.16-rc3.xz
7427a491180a3a85883652ebd6500fc5 patch-3.16-rc3-git1.xz
436a44358b6011f5a85a1c8391603bde patch-3.16-rc3-git2.xz