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d4664b6c98
linux/arch/arm/lib
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Ard Biesheuvel d4664b6c98 ARM: implement IRQ stacks 
Now that we no longer rely on the stack pointer to access the current
task struct or thread info, we can implement support for IRQ stacks
cleanly as well.

Define a per-CPU IRQ stack and switch to this stack when taking an IRQ,
provided that we were not already using that stack in the interrupted
context. This is never the case for IRQs taken from user space, but ones
taken while running in the kernel could fire while one taken from user
space has not completed yet.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Keith Packard <keithpac@amazon.com>
Acked-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Marc Zyngier <maz@kernel.org>
Tested-by: Vladimir Murzin <vladimir.murzin@arm.com> # ARMv7M
2021-12-03 15:11:31 +01:00
..
ashldi3.S Revert "arm: move exports to definitions" 2016-11-23 10:00:03 +00:00
ashrdi3.S Revert "arm: move exports to definitions" 2016-11-23 10:00:03 +00:00
backtrace-clang.S ARM: implement IRQ stacks 2021-12-03 15:11:31 +01:00
backtrace.S ARM: implement IRQ stacks 2021-12-03 15:11:31 +01:00
bitops.h ARM: 8843/1: use unified assembler in headers 2019-02-26 11:26:06 +00:00
bswapsdi2.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
call_with_stack.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333 2019-06-05 17:37:06 +02:00
changebit.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
clear_user.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
clearbit.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
copy_from_user.S ARM: 9113/1: uaccess: remove set_fs() implementation 2021-08-20 11:39:27 +01:00
copy_page.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
copy_template.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
copy_to_user.S ARM: 9113/1: uaccess: remove set_fs() implementation 2021-08-20 11:39:27 +01:00
csumipv6.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
csumpartial.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
csumpartialcopy.S arm: propagate the calling convention changes down to csum_partial_copy_from_user() 2020-08-20 15:45:16 -04:00
csumpartialcopygeneric.S arm: propagate the calling convention changes down to csum_partial_copy_from_user() 2020-08-20 15:45:16 -04:00
csumpartialcopyuser.S arm: propagate the calling convention changes down to csum_partial_copy_from_user() 2020-08-20 15:45:16 -04:00
delay-loop.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
delay.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333 2019-06-05 17:37:06 +02:00
div64.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
findbit.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
getuser.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
io-readsb.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
io-readsl.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
io-readsw-armv3.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
io-readsw-armv4.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
io-writesb.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
io-writesl.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
io-writesw-armv3.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
io-writesw-armv4.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
lib1funcs.S ARM: 8844/1: use unified assembler in assembly files 2019-02-26 11:26:07 +00:00
lshrdi3.S Revert "arm: move exports to definitions" 2016-11-23 10:00:03 +00:00
Makefile ARM: 8900/1: UNWINDER_FRAME_POINTER implementation for Clang 2019-08-29 07:58:01 +01:00
memchr.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
memcpy.S ARM: 9022/1: Change arch/arm/lib/mem*.S to use WEAK instead of .weak 2020-11-12 14:53:19 +00:00
memmove.S ARM: 9022/1: Change arch/arm/lib/mem*.S to use WEAK instead of .weak 2020-11-12 14:53:19 +00:00
memset.S ARM: 9022/1: Change arch/arm/lib/mem*.S to use WEAK instead of .weak 2020-11-12 14:53:19 +00:00
muldi3.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
putuser.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
setbit.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
strchr.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
strrchr.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
testchangebit.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
testclearbit.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
testsetbit.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
uaccess_with_memcpy.c mmap locking API: use coccinelle to convert mmap_sem rwsem call sites 2020-06-09 09:39:14 -07:00
ucmpdi2.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
xor-neon.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00