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Matt Redfearn 8a46f71d34 MIPS: CPS: Fix use of current_cpu_data in preemptible code 
Commit 1ec9dd80be ("MIPS: CPS: Detect CPUs in secondary clusters")
added a check in cps_boot_secondary() that the secondary being booted is
in the same cluster as the CPU running this code. This check is
performed using current_cpu_data without disabling preemption. As such
when CONFIG_PREEMPT=y, a BUG is triggered:

[   57.991693] BUG: using smp_processor_id() in preemptible [00000000] code: hotplug/1749
<snip>
[   58.063077] Call Trace:
[   58.065842] [<8040cdb4>] show_stack+0x84/0x114
[   58.070830] [<80b11b38>] dump_stack+0xf8/0x140
[   58.075796] [<8079b12c>] check_preemption_disabled+0xec/0x118
[   58.082204] [<80415110>] cps_boot_secondary+0x84/0x44c
[   58.087935] [<80413a14>] __cpu_up+0x34/0x98
[   58.092624] [<80434240>] bringup_cpu+0x38/0x114
[   58.097680] [<80434af0>] cpuhp_invoke_callback+0x168/0x8f0
[   58.103801] [<804362d0>] _cpu_up+0x154/0x1c8
[   58.108565] [<804363dc>] do_cpu_up+0x98/0xa8
[   58.113333] [<808261f8>] device_online+0x84/0xc0
[   58.118481] [<80826294>] online_store+0x60/0x98
[   58.123562] [<8062261c>] kernfs_fop_write+0x158/0x1d4
[   58.129196] [<805a2ae4>] __vfs_write+0x4c/0x168
[   58.134247] [<805a2dc8>] vfs_write+0xe0/0x190
[   58.139095] [<805a2fe0>] SyS_write+0x68/0xc4
[   58.143854] [<80415d58>] syscall_common+0x34/0x58

In reality we don't currently support running the kernel on CPUs not in
cluster 0, so the answer to cpu_cluster(&current_cpu_data) will always
be 0, even if this task being preempted and continues running on a
different CPU. Regardless, the BUG should not be triggered, so fix this
by switching to raw_current_cpu_data. When multicluster support lands
upstream this check will need removing or changing anyway.

Fixes: 1ec9dd80be ("MIPS: CPS: Detect CPUs in secondary clusters")
Signed-off-by: Matt Redfearn <matt.redfearn@mips.com>
Reviewed-by: Paul Burton <paul.burton@mips.com>
CC: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/17563/
Signed-off-by: James Hogan <jhogan@kernel.org>
 		2017-11-01 21:05:57 +00:00
Documentation Update MIPS email addresses 2017-10-31 22:42:39 +00:00
arch MIPS: CPS: Fix use of current_cpu_data in preemptible code 2017-11-01 21:05:57 +00:00
block bio_copy_user_iov(): don't ignore ->iov_offset 2017-10-10 23:55:14 -04:00
certs modsign: add markers to endif-statements in certs/Makefile 2017-07-14 11:01:37 +10:00
crypto Merge commit 'tags/keys-fixes-20171018' into fixes-v4.14-rc5 2017-10-19 12:28:38 +11:00
drivers Update MIPS email addresses 2017-10-31 22:42:39 +00:00
firmware firmware: Restore support for built-in firmware 2017-09-16 10:58:48 -07:00
fs Various SMB3 fixes for 4.14 and stable 2017-10-28 08:39:35 -07:00
include Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-10-29 08:11:49 -07:00
init kbuild: Fix optimization level choice default 2017-10-07 20:08:05 +09:00
ipc fix a typo in put_compat_shm_info() 2017-09-25 20:41:46 -04:00
kernel Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-10-29 08:11:49 -07:00
lib assoc_array: Fix a buggy node-splitting case 2017-10-28 10:31:07 -07:00
mm Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-10-21 22:44:48 -04:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-10-29 08:11:49 -07:00
samples Fix tracing sample code warning. 2017-10-27 20:35:31 -07:00
scripts Kbuild fixes for v4.14 (2nd) 2017-10-28 11:01:57 -07:00
security Revert "apparmor: add base infastructure for socket mediation" 2017-10-26 19:35:35 +02:00
sound ALSA: hda - fix headset mic problem for Dell machines with alc236 2017-10-24 14:32:24 +02:00
tools Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-10-29 08:11:49 -07:00
usr ramfs: clarify help text that compression applies to ramfs as well as legacy ramdisk. 2017-07-06 16:24:30 -07:00
virt Revert "KVM: Don't accept obviously wrong gsi values via KVM_IRQFD" 2017-09-19 08:37:17 +02:00
.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: Add support to generate LLVM assembly files 2017-04-25 08:13:52 +09:00
.mailmap Update MIPS email addresses 2017-10-31 22:42:39 +00:00
COPYING
…
CREDITS selinux/stable-4.14 PR 20170831 2017-09-12 13:21:00 -07:00
Kbuild kbuild: Consolidate header generation from ASM offset information 2017-04-13 05:43:37 +09:00
Kconfig kbuild: migrate all arch to the kconfig mainmenu upgrade 2010-09-19 22:54:11 -04:00
MAINTAINERS Update MIPS email addresses 2017-10-31 22:42:39 +00:00
Makefile Linux 4.14-rc7 2017-10-29 13:58:38 -07:00
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.