Steven Rostedt (VMware) b4c7e2bd2e ARM: 8780/1: ftrace: Only set kernel memory back to read-only after boot ... Dynamic ftrace requires modifying the code segments that are usually set to read-only. To do this, a per arch function is called both before and after the ftrace modifications are performed. The "before" function will set kernel code text to read-write to allow for ftrace to make the modifications, and the "after" function will set the kernel code text back to "read-only" to keep the kernel code text protected. The issue happens when dynamic ftrace is tested at boot up. The test is done before the kernel code text has been set to read-only. But the "before" and "after" calls are still performed. The "after" call will change the kernel code text to read-only prematurely, and other boot code that expects this code to be read-write will fail. The solution is to add a variable that is set when the kernel code text is expected to be converted to read-only, and make the ftrace "before" and "after" calls do nothing if that variable is not yet set. This is similar to the x86 solution from commit 1623963097 ("ftrace, x86: make kernel text writable only for conversions"). Link: http://lkml.kernel.org/r/20180620212906.24b7b66e@vmware.local.home Reported-by: Stefan Agner <stefan@agner.ch> Tested-by: Stefan Agner <stefan@agner.ch> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>		2018-07-11 22:57:57 +01:00
..
abort-ev4.S	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
abort-ev4t.S	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
abort-ev5t.S	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
abort-ev5tj.S	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
abort-ev6.S	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
abort-ev7.S	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
abort-lv4t.S	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
abort-macro.S	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
abort-nommu.S	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
alignment.c	signal: Ensure every siginfo we send has all bits initialized	2018-04-25 10:40:51 -05:00
cache-aurora-l2.h
cache-b15-rac.c	ARM: B15: Update to support Brahma-B53	2018-04-16 15:16:48 -07:00
cache-fa.S
cache-feroceon-l2.c
cache-l2x0-pmu.c	perf: Fix sibling iteration	2018-03-16 20:44:12 +01:00
cache-l2x0.c
cache-nop.S
cache-tauros2.c
cache-tauros3.h
cache-uniphier.c
cache-v4.S
cache-v4wb.S	ARM: align .data section	2017-08-14 16:22:55 +01:00
cache-v4wt.S
cache-v6.S
cache-v7.S	ARM: 8729/1: Hook B15 readahead cache functions based on processor	2017-12-17 22:15:36 +00:00
cache-v7m.S
cache-xsc3l2.c
context.c
copypage-fa.c
copypage-feroceon.c
copypage-v4mc.c	mm: fix races between swapoff and flush dcache	2018-04-05 21:36:26 -07:00
copypage-v4wb.c
copypage-v4wt.c
copypage-v6.c	mm: fix races between swapoff and flush dcache	2018-04-05 21:36:26 -07:00
copypage-xsc3.c
copypage-xscale.c	mm: fix races between swapoff and flush dcache	2018-04-05 21:36:26 -07:00
dma-mapping-nommu.c	dma-debug: move initialization to common code	2018-05-08 13:02:42 +02:00
dma-mapping.c	treewide: kzalloc() -> kcalloc()	2018-06-12 16:19:22 -07:00
dma.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
dump.c	ARM: 8737/1: mm: dump: add checking for writable and executable	2018-01-21 15:32:20 +00:00
extable.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
fault-armv.c	mm: fix races between swapoff and flush dcache	2018-04-05 21:36:26 -07:00
fault.c	Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm	2018-06-06 13:49:25 -07:00
fault.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
flush.c	mm: fix races between swapoff and flush dcache	2018-04-05 21:36:26 -07:00
fsr-2level.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
fsr-3level.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
highmem.c
hugetlbpage.c
idmap.c	ARM: 8734/1: mm: idmap: Mark variables as ro_after_init	2017-12-17 22:16:20 +00:00
init.c	ARM: 8780/1: ftrace: Only set kernel memory back to read-only after boot	2018-07-11 22:57:57 +01:00
iomap.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
ioremap.c
Kconfig	Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm	2018-06-06 13:49:25 -07:00
l2c-common.c
l2c-l2x0-resume.S	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
Makefile	Merge branches 'fixes', 'misc' and 'spectre' into for-linus	2018-06-05 10:03:27 +01:00
mm.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
mmap.c	exec: pass stack rlimit into mm layout functions	2018-04-11 10:28:37 -07:00
mmu.c
nommu.c	ARM: 8757/1: NOMMU: Support PMSAv8 MPU	2018-05-19 11:53:46 +01:00
pabort-legacy.S	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
pabort-v6.S	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
pabort-v7.S	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
pageattr.c
pgd.c	treewide: kmalloc() -> kmalloc_array()	2018-06-12 16:19:22 -07:00
physaddr.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
pmsa-v7.c	ARM: 8754/1: NOMMU: Move PMSAv7 MPU under it's own namespace	2018-05-19 11:53:46 +01:00
pmsa-v8.c	ARM: 8757/1: NOMMU: Support PMSAv8 MPU	2018-05-19 11:53:46 +01:00
proc-arm7tdmi.S
proc-arm9tdmi.S
proc-arm720.S
proc-arm740.S
proc-arm920.S
proc-arm922.S
proc-arm925.S
proc-arm926.S
proc-arm940.S
proc-arm946.S
proc-arm1020.S
proc-arm1020e.S
proc-arm1022.S
proc-arm1026.S
proc-fa526.S
proc-feroceon.S
proc-macros.S	ARM: bugs: add support for per-processor bug checking	2018-05-31 10:39:34 +01:00
proc-mohawk.S
proc-sa110.S
proc-sa1100.S
proc-syms.c
proc-v6.S
proc-v7-2level.S	ARM: spectre-v2: harden branch predictor on context switches	2018-05-31 10:39:55 +01:00
proc-v7-3level.S	ARM: 8690/1: lpae: build TTB control register value from scratch in v7_ttb_setup	2017-08-29 13:09:12 +01:00
proc-v7-bugs.c	ARM: spectre-v2: warn about incorrect context switching functions	2018-05-31 11:09:03 +01:00
proc-v7.S	Merge branches 'fixes', 'misc' and 'spectre' into for-linus	2018-06-05 10:03:27 +01:00
proc-v7m.S
proc-xsc3.S
proc-xscale.S	ARM: align .data section	2017-08-14 16:22:55 +01:00
ptdump_debugfs.c	ARM: 8735/1: mm: dump: make page table dumping reusable	2018-01-21 15:32:17 +00:00
pv-fixup-asm.S
tcm.h
tlb-fa.S
tlb-v4.S
tlb-v4wb.S
tlb-v4wbi.S
tlb-v6.S
tlb-v7.S