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Sebastian Ott 510e1e8020 s390/dasd: use blk_mq_rq_from_pdu for per request data 
[ Upstream commit f0f59a2fab ]

Dasd uses completion_data from struct request to store per request
private data - this is problematic since this member is part of a
union which is also used by IO schedulers.
Let the block layer maintain space for per request data behind each
struct request.

Fixes crashes on block layer timeouts like this one:

Unable to handle kernel pointer dereference in virtual kernel address space
Failing address: 0000000000000000 TEID: 0000000000000483
Fault in home space mode while using kernel ASCE.
AS:0000000001308007 R3:00000000fffc8007 S:00000000fffcc000 P:000000000000013d
Oops: 0004 ilc:2 [#1] PREEMPT SMP
Modules linked in: [...]
CPU: 0 PID: 1480 Comm: kworker/0:2H Not tainted 4.17.0-rc4-00046-gaa3bcd43b5af #203
Hardware name: IBM 3906 M02 702 (LPAR)
Workqueue: kblockd blk_mq_timeout_work
Krnl PSW : 0000000067ac406b 00000000b6960308 (do_raw_spin_trylock+0x30/0x78)
           R:0 T:1 IO:0 EX:0 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3
Krnl GPRS: 0000000000000c00 0000000000000000 0000000000000000 0000000000000001
           0000000000b9d3c8 0000000000000000 0000000000000001 00000000cf9639d8
           0000000000000000 0700000000000000 0000000000000000 000000000099f09e
           0000000000000000 000000000076e9d0 000000006247bb08 000000006247bae0
Krnl Code: 00000000001c159c: b90400c2           lgr     %r12,%r2
           00000000001c15a0: a7180000           lhi     %r1,0
          #00000000001c15a4: 583003a4           l       %r3,932
          >00000000001c15a8: ba132000           cs      %r1,%r3,0(%r2)
           00000000001c15ac: a7180001           lhi     %r1,1
           00000000001c15b0: a784000b           brc     8,1c15c6
           00000000001c15b4: c0e5004e72aa       brasl   %r14,b8fb08
           00000000001c15ba: 1812               lr      %r1,%r2
Call Trace:
([<0700000000000000>] 0x700000000000000)
 [<0000000000b9d3d2>] _raw_spin_lock_irqsave+0x7a/0xb8
 [<000000000099f09e>] dasd_times_out+0x46/0x278
 [<000000000076ea6e>] blk_mq_terminate_expired+0x9e/0x108
 [<000000000077497a>] bt_for_each+0x102/0x130
 [<0000000000774e54>] blk_mq_queue_tag_busy_iter+0x74/0xd8
 [<000000000076fea0>] blk_mq_timeout_work+0x260/0x320
 [<0000000000169dd4>] process_one_work+0x3bc/0x708
 [<000000000016a382>] worker_thread+0x262/0x408
 [<00000000001723a8>] kthread+0x160/0x178
 [<0000000000b9e73a>] kernel_thread_starter+0x6/0xc
 [<0000000000b9e734>] kernel_thread_starter+0x0/0xc
INFO: lockdep is turned off.
Last Breaking-Event-Address:
 [<0000000000b9d3cc>] _raw_spin_lock_irqsave+0x74/0xb8

Kernel panic - not syncing: Fatal exception: panic_on_oops

Signed-off-by: Sebastian Ott <sebott@linux.ibm.com>
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2018-07-08 15:30:51 +02:00
Documentation cxl: Disable prefault_mode in Radix mode 2018-07-03 11:24:51 +02:00
arch ARM: dts: imx6q: Use correct SDMA script for SPI5 core 2018-07-08 15:30:51 +02:00
block block: Fix cloning of requests with a special payload 2018-07-03 11:25:05 +02:00
certs License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
crypto X.509: unpack RSA signatureValue field from BIT STRING 2018-07-03 11:24:57 +02:00
drivers s390/dasd: use blk_mq_rq_from_pdu for per request data 2018-07-08 15:30:51 +02:00
firmware License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
fs afs: Fix directory permissions check 2018-07-08 15:30:51 +02:00
include netfilter: nf_tables: bogus EBUSY in chain deletions 2018-07-08 15:30:49 +02:00
init init: fix false positives in W+X checking 2018-06-21 04:02:57 +09:00
ipc ipc/shm: fix shmat() nil address after round-down when remapping 2018-05-30 07:51:49 +02:00
kernel time: Make sure jiffies_to_msecs() preserves non-zero time periods 2018-07-03 11:24:56 +02:00
lib lib/vsprintf: Remove atomic-unsafe support for %pCr 2018-07-03 11:24:48 +02:00
mm slub: fix failure when we delete and create a slab cache 2018-07-03 11:25:04 +02:00
net netfilter: ebtables: handle string from userspace with care 2018-07-08 15:30:51 +02:00
samples samples/bpf: Partially fixes the bpf.o build 2018-04-26 11:02:12 +02:00
scripts kconfig: Avoid format overflow warning from GCC 8.1 2018-06-11 22:49:18 +02:00
security selinux: KASAN: slab-out-of-bounds in xattr_getsecurity 2018-06-05 11:41:56 +02:00
sound ALSA: hda/realtek - Fix the problem of two front mics on more machines 2018-07-03 11:25:04 +02:00
tools perf vendor events: Add Goldmont Plus V1 event file 2018-07-03 11:25:01 +02:00
usr initramfs: fix initramfs rebuilds w/ compression after disabling 2017-11-03 07:39:19 -07:00
virt KVM: arm/arm64: vgic: fix possible spectre-v1 in vgic_mmio_read_apr() 2018-06-21 04:02:49 +09:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Add hch to .get_maintainer.ignore 2015-08-21 14:30:10 -07:00
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore kbuild: rpm-pkg: keep spec file until make mrproper 2018-02-13 10:19:46 +01:00
.mailmap .mailmap: Add Maciej W. Rozycki's Imagination e-mail address 2017-11-10 12:16:15 -08:00
COPYING
…
CREDITS MAINTAINERS: update TPM driver infrastructure changes 2017-11-09 17:58:40 -08:00
Kbuild License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
MAINTAINERS dt-bindings: Document mti,mips-cpc binding 2018-03-15 10:54:35 +01:00
Makefile Linux 4.14.53 2018-07-03 11:25:05 +02:00
README README: add a new README file, pointing to the Documentation/ 2016-10-24 08:12:35 -02:00

README 

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.