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Michael Ellerman be5c5e843c powerpc/64: Fix HMI exception on LE with CONFIG_RELOCATABLE=y 
Prior to commit 2337d20728 ("powerpc/64: CONFIG_RELOCATABLE support for hmi
interrupts"), the branch from hmi_exception_early() to hmi_exception_realmode()
was just a bl hmi_exception_realmode, which the linker would turn into a bl to
the local entry point of hmi_exception_realmode. This was broken when
CONFIG_RELOCATABLE=y because hmi_exception_realmode() is not in the low part of
the kernel text that is copied down to 0x0.

But in fixing that, we added a new bug on little endian kernels. Because the
branch is now a bctrl when CONFIG_RELOCATABLE=y, we branch to the global entry
point of hmi_exception_realmode(). The global entry point must be called with
r12 containing the address of hmi_exception_realmode(), because it uses that
value to calculate the TOC value (r2).

This may manifest as a checkstop, because we take a junk value from r12 which
came from HSRR1, add a small constant to it and then use that as the TOC
pointer. The HSRR1 value will have 0x9 as the top nibble, which puts it above
RAM and somewhere in MMIO space.

Fix it by changing the BRANCH_LINK_TO_FAR() macro to always use r12 to load the
label we're branching to. This means r12 will be setup correctly on LE, fixing
this bug, and r12 is also volatile across function calls on BE so it's a good
choice anyway.

Fixes: 2337d20728 ("powerpc/64: CONFIG_RELOCATABLE support for hmi interrupts")
Reported-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Acked-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2017-04-18 20:19:52 +10:00
arch powerpc/64: Fix HMI exception on LE with CONFIG_RELOCATABLE=y 2017-04-18 20:19:52 +10:00
block blk-mq-sched: don't run the queue async from blk_mq_try_issue_directly() 2017-03-14 11:51:59 -06:00
certs certs: Add a secondary system keyring that can be added to dynamically 2016-04-11 22:48:09 +01:00
crypto net: Work around lockdep limitation in sockets that use sockets 2017-03-09 18:23:27 -08:00
Documentation gcc-plugins: update architecture list in documentation 2017-03-21 22:20:05 +11:00
drivers cxl: Route eeh events to all slices for pci_channel_io_perm_failure state 2017-03-20 20:19:36 +11:00
firmware WHENCE: use https://linuxtv.org for LinuxTV URLs 2015-12-04 10:35:11 -02:00
fs NFS client fixes for 4.11 2017-03-17 14:16:22 -07:00
include Merge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2017-03-19 18:06:31 -07:00
init Change get_random_{int,log} to use the CRNG used by /dev/urandom and 2017-03-11 09:08:47 -08:00
ipc Merge branch 'WIP.sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-03-03 10:16:38 -08:00
kernel Merge branch 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-03-18 08:33:44 -07:00
lib mm: convert generic code to 5-level paging 2017-03-09 11:48:47 -08:00
mm mm/swap: don't BUG_ON() due to uninitialized swap slot cache 2017-03-19 19:00:47 -07:00
net NFS client fixes for 4.11 2017-03-17 14:16:22 -07:00
samples Merge branch 'rebased-statx' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-03-03 11:38:56 -08:00
scripts Merge branch 'akpm' (patches from Andrew) 2017-03-10 08:34:42 -08:00
security Merge branch 'WIP.sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-03-03 10:16:38 -08:00
sound scripts/spelling.txt: add "disble(d)" pattern and fix typo instances 2017-03-09 17:01:09 -08:00
tools selftests/powerpc: Fix standalone powerpc build 2017-03-27 15:11:44 +11:00
usr kbuild: initramfs cleanup, set target from Kconfig 2017-01-05 09:40:16 -08:00
virt KVM: arm/arm64: VGIC: Fix command handling while ITS being disabled 2017-03-07 15:44:08 +00:00
.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 mailmap: add codeaurora.org names for nameless email commits 2017-01-10 18:31:55 -08:00
COPYING
CREDITS MAINTAINERS: Remove old e-mail address 2017-02-13 12:24:56 -05:00
Kbuild scripts/gdb: provide linux constants 2016-05-23 17:04:14 -07:00
Kconfig
MAINTAINERS MAINTAINERS: usb251xb: remove reference inexistent file 2017-03-09 10:34:16 +01:00
Makefile Linux 4.11-rc3 2017-03-19 19:09:39 -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.