This is a note to let you know that I've just added the patch titled
xen-blkfront: drop the use of llist_for_each_entry_safe
to the 3.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
xen-blkfront-drop-the-use-of-llist_for_each_entry_safe.patch
and it can be found in the queue-3.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f84adf4921ae3115502f44ff467b04bf2f88cf04 Mon Sep 17 00:00:00 2001
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Wed, 13 Feb 2013 13:01:55 -0500
Subject: xen-blkfront: drop the use of llist_for_each_entry_safe
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
commit f84adf4921ae3115502f44ff467b04bf2f88cf04 upstream.
Replace llist_for_each_entry_safe with a while loop.
llist_for_each_entry_safe can trigger a bug in GCC 4.1, so it's best
to remove it and use a while loop and do the deletion manually.
Specifically this bug can be triggered by hot-unplugging a disk, either
by doing xm block-detach or by save/restore cycle.
BUG: unable to handle kernel paging request at fffffffffffffff0
IP: [<ffffffffa0047223>] blkif_free+0x63/0x130 [xen_blkfront]
The crash call trace is:
...
bad_area_nosemaphore+0x13/0x20
do_page_fault+0x25e/0x4b0
page_fault+0x25/0x30
? blkif_free+0x63/0x130 [xen_blkfront]
blkfront_resume+0x46/0xa0 [xen_blkfront]
xenbus_dev_resume+0x6c/0x140
pm_op+0x192/0x1b0
device_resume+0x82/0x1e0
dpm_resume+0xc9/0x1a0
dpm_resume_end+0x15/0x30
do_suspend+0x117/0x1e0
When drilling down to the assembler code, on newer GCC it does
.L29:
cmpq $-16, %r12 #, persistent_gnt check
je .L30 #, out of the loop
.L25:
... code in the loop
testq %r13, %r13 # n
je .L29 #, back to the top of the loop
cmpq $-16, %r12 #, persistent_gnt check
movq 16(%r12), %r13 # <variable>.node.next, n
jne .L25 #, back to the top of the loop
.L30:
While on GCC 4.1, it is:
L78:
... code in the loop
testq %r13, %r13 # n
je .L78 #, back to the top of the loop
movq 16(%rbx), %r13 # <variable>.node.next, n
jmp .L78 #, back to the top of the loop
Which basically means that the exit loop condition instead of
being:
&(pos)->member != NULL;
is:
;
which makes the loop unbound.
Since xen-blkfront is the only user of the llist_for_each_entry_safe
macro remove it from llist.h.
Orabug: 16263164
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/block/xen-blkfront.c | 13 ++++++++++---
include/linux/llist.h | 25 -------------------------
2 files changed, 10 insertions(+), 28 deletions(-)
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -791,7 +791,7 @@ static void blkif_restart_queue(struct w
static void blkif_free(struct blkfront_info *info, int suspend)
{
struct llist_node *all_gnts;
- struct grant *persistent_gnt;
+ struct grant *persistent_gnt, *tmp;
struct llist_node *n;
/* Prevent new requests being issued until we fix things up. */
@@ -805,10 +805,17 @@ static void blkif_free(struct blkfront_i
/* Remove all persistent grants */
if (info->persistent_gnts_c) {
all_gnts = llist_del_all(&info->persistent_gnts);
- llist_for_each_entry_safe(persistent_gnt, n, all_gnts, node) {
+ persistent_gnt = llist_entry(all_gnts, typeof(*(persistent_gnt)), node);
+ while (persistent_gnt) {
gnttab_end_foreign_access(persistent_gnt->gref, 0, 0UL);
__free_page(pfn_to_page(persistent_gnt->pfn));
- kfree(persistent_gnt);
+ tmp = persistent_gnt;
+ n = persistent_gnt->node.next;
+ if (n)
+ persistent_gnt = llist_entry(n, typeof(*(persistent_gnt)), node);
+ else
+ persistent_gnt = NULL;
+ kfree(tmp);
}
info->persistent_gnts_c = 0;
}
--- a/include/linux/llist.h
+++ b/include/linux/llist.h
@@ -125,31 +125,6 @@ static inline void init_llist_head(struc
(pos) = llist_entry((pos)->member.next, typeof(*(pos)), member))
/**
- * llist_for_each_entry_safe - iterate safely against remove over some entries
- * of lock-less list of given type.
- * @pos: the type * to use as a loop cursor.
- * @n: another type * to use as a temporary storage.
- * @node: the fist entry of deleted list entries.
- * @member: the name of the llist_node with the struct.
- *
- * In general, some entries of the lock-less list can be traversed
- * safely only after being removed from list, so start with an entry
- * instead of list head. This variant allows removal of entries
- * as we iterate.
- *
- * If being used on entries deleted from lock-less list directly, the
- * traverse order is from the newest to the oldest added entry. If
- * you want to traverse from the oldest to the newest, you must
- * reverse the order by yourself before traversing.
- */
-#define llist_for_each_entry_safe(pos, n, node, member) \
- for ((pos) = llist_entry((node), typeof(*(pos)), member), \
- (n) = (pos)->member.next; \
- &(pos)->member != NULL; \
- (pos) = llist_entry(n, typeof(*(pos)), member), \
- (n) = (&(pos)->member != NULL) ? (pos)->member.next : NULL)
-
-/**
* llist_empty - tests whether a lock-less list is empty
* @head: the list to test
*
Patches currently in stable-queue which might be from konrad.wilk@xxxxxxxxxx are
queue-3.8/xen-blkfront-drop-the-use-of-llist_for_each_entry_safe.patch
queue-3.8/xen-blkback-use-balloon-pages-for-persistent-grants.patch
queue-3.8/doc-kernel-parameters-document-console-hvc-n.patch
queue-3.8/xen-blkback-do-not-leak-mode-property.patch
queue-3.8/xen-blkback-don-t-trust-the-handle-from-the-frontend.patch
queue-3.8/doc-xen-mention-earlyprintk-xen-in-the-documentation.patch
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