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Shanker Donthineni ea6eac904f arm64: Avoid clobbering mm in erratum workaround on QDF2400 
Commit 38fd94b027 ("arm64: Work around Falkor erratum 1003") tried to
work around a hardware erratum, but actually caused a system crash of
its own during switch_mm:

 cpu_do_switch_mm+0x20/0x40
 efi_virtmap_load+0x34/0x40
 virt_efi_get_next_variable+0x64/0xc8
 efivar_init+0x8c/0x348
 efisubsys_init+0xd4/0x270
 do_one_initcall+0x80/0x110
 kernel_init_freeable+0x19c/0x240
 kernel_init+0x10/0x100
 ret_from_fork+0x10/0x50

 Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b

In cpu_do_switch_mm, x1 contains the mm_struct pointer, which needs to
be preserved by the pre_ttbr0_update_workaround macro rather than passed
as a temporary.

This patch clobbers x2 and x3 instead, keeping the mm_struct intact
after the workaround has run.

Fixes: 38fd94b027 ("arm64: Work around Falkor erratum 1003")
Tested-by: Manoj Iyer <manoj.iyer@canonical.com>
Signed-off-by: Shanker Donthineni <shankerd@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2017-02-24 10:55:31 +00:00
arch arm64: Avoid clobbering mm in erratum workaround on QDF2400 2017-02-24 10:55:31 +00:00
block Merge branch 'for-linus' of git://git.kernel.dk/linux-block 2017-01-04 09:03:37 -08:00
certs certs: Add a secondary system keyring that can be added to dynamically 2016-04-11 22:48:09 +01:00
crypto crypto: testmgr - Use heap buffer for acomp test input 2016-12-27 17:32:11 +08:00
Documentation arm64: Work around Falkor erratum 1003 2017-02-10 11:22:12 +00:00
drivers perf: add qcom l2 cache perf events driver 2017-02-08 19:32:24 +00:00
firmware WHENCE: use https://linuxtv.org for LinuxTV URLs 2015-12-04 10:35:11 -02:00
fs Merge branch 'stable-4.10' of git://git.infradead.org/users/pcmoore/audit 2017-01-05 23:06:06 -08:00
include perf: add qcom l2 cache perf events driver 2017-02-08 19:32:24 +00:00
init mm: add PageWaiters indicating tasks are waiting for a page bit 2016-12-25 11:54:48 -08:00
ipc ipc/sem: avoid idr tree lookup for interrupted semop 2016-12-14 16:04:08 -08:00
kernel Merge branch 'aarch64/for-next/debug-virtual' into aarch64/for-next/core 2017-01-12 15:04:29 +00:00
lib Merge branch 'aarch64/for-next/debug-virtual' into aarch64/for-next/core 2017-01-12 15:04:29 +00:00
mm Merge branch 'aarch64/for-next/debug-virtual' into aarch64/for-next/core 2017-01-12 15:04:29 +00:00
net drop_monitor: consider inserted data in genlmsg_end 2017-01-03 11:09:44 -05:00
samples vfio-mdev: fix some error codes in the sample code 2017-01-04 08:32:23 -07:00
scripts gcc-plugins: update gcc-common.h for gcc-7 2017-01-03 12:08:59 -08:00
security Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
sound Revert "ALSA: firewire-lib: change structure member with proper type" 2017-01-05 08:39:47 +01:00
tools Merge branch 'turbostat' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux 2016-12-25 14:01:28 -08:00
usr kbuild: initramfs cleanup, set target from Kconfig 2017-01-05 09:40:16 -08:00
virt Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-12-25 14:30:04 -08:00
.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 Merge branch 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2016-08-02 16:48:52 -04:00
.mailmap Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2016-10-15 09:26:12 -07:00
COPYING
CREDITS CREDITS: Remove outdated address information 2016-12-21 15:21:29 -08:00
Kbuild scripts/gdb: provide linux constants 2016-05-23 17:04:14 -07:00
Kconfig
MAINTAINERS Char/Misc fixes for 4.10-rc3 2017-01-08 11:37:44 -08:00
Makefile Linux 4.10-rc3 2017-01-08 14:18:17 -08:00
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.