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Ard Biesheuvel d119678708 ARM: ftrace: avoid redundant loads or clobbering IP 
Tweak the ftrace return paths to avoid redundant loads of SP, as well as
unnecessary clobbering of IP.

This also fixes the inconsistency of using MOV to perform a function
return, which is sub-optimal on recent micro-architectures but more
importantly, does not perform an interworking return, unlike compiler
generated function returns in Thumb2 builds.

Let's fix this by popping PC from the stack like most ordinary code
does.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
2022-02-09 09:12:32 +01:00
..
.gitignore
.gitignore: add SPDX License Identifier
2020-03-25 11:50:48 +01:00
arch_timer.c
ARM: 8913/1: arch_timer: include <asm/arch_timer.h>
2019-10-27 21:14:43 +00:00
armksyms.c
crypto: lib/sha1 - remove unnecessary includes of linux/cryptohash.h
2020-05-08 15:32:17 +10:00
asm-offsets.c
ARM: implement THREAD_INFO_IN_TASK for uniprocessor systems
2021-12-06 12:49:17 +01:00
atags_compat.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
atags_parse.c
ARM: 9011/1: centralize phys-to-virt conversion of DT/ATAGS address
2020-10-27 12:10:59 +00:00
atags_proc.c
ARM: 8973/1: Add missing newline terminator to kernel message
2020-05-07 20:53:10 +01:00
atags.h
ARM: 9011/1: centralize phys-to-virt conversion of DT/ATAGS address
2020-10-27 12:10:59 +00:00
bios32.c
ARM/PCI: Remove unused fields from struct hw_pci
2020-09-18 22:39:09 +01:00
bugs.c
treewide: fix typos of SPDX-License-Identifier
2019-06-01 18:29:58 +02:00
cpuidle.c
treewide: Convert macro and uses of __section(foo) to __section("foo")
2020-10-25 14:51:49 -07:00
crash_dump.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
debug.S
ARM: 9005/1: debug: Select flow control for all debug UARTs
2020-09-15 14:35:28 +01:00
devtree.c
ARM: Use of_get_cpu_hwid()
2021-10-20 13:36:30 -05:00
dma-isa.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
dma.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
early_printk.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
efi.c
mm/pgtable: drop pgtable_t variable from pte_fn_t functions
2019-07-12 11:05:46 -07:00
elf.c
arm32/64/elf: Split READ_IMPLIES_EXEC from executable PT_GNU_STACK
2020-04-20 19:42:19 +02:00
entry-armv.S
ARM: entry: avoid clobbering R9 in IRQ handler
2022-01-25 09:53:52 +01:00
entry-common.S
ARM: iop32x: use GENERIC_IRQ_MULTI_HANDLER
2021-12-06 12:49:04 +01:00
entry-ftrace.S
ARM: ftrace: avoid redundant loads or clobbering IP
2022-02-09 09:12:32 +01:00
entry-header.S
ARM: smp: elide HWCAP_TLS checks or __entry_task updates on SMP+v6
2022-01-25 09:53:52 +01:00
entry-v7m.S
ARM: v7m: enable support for IRQ stacks
2021-12-06 12:49:17 +01:00
fiq.c
arm: fix the flush_icache_range arguments in set_fiq_handler
2020-06-08 11:05:57 -07:00
fiqasm.S
…
ftrace.c
ARM: ftrace: use trampolines to keep .init.text in branching range
2022-02-09 09:12:32 +01:00
head-common.S
ARM: implement THREAD_INFO_IN_TASK for uniprocessor systems
2021-12-06 12:49:17 +01:00
head-inflate-data.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
head-nommu.S
ARM: smp: Pass task to secondary_start_kernel
2021-09-27 16:54:01 +02:00
head.S
ARM: mm: switch to swapper_pg_dir early for vmap'ed stack
2022-01-24 20:37:55 +01:00
hibernate.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194
2019-05-30 11:29:22 -07:00
hw_breakpoint.c
ARM: 9064/1: hw_breakpoint: Do not directly check the event's overflow_handler hook
2021-03-25 10:27:41 +00:00
hyp-stub.S
Merge branch 'devel-stable' into for-next
2020-12-21 11:19:26 +00:00
insn.c
ARM: 9078/1: Add warn suppress parameter to arm_gen_branch_link()
2021-06-07 12:56:20 +01:00
io.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
irq.c
ARM: remove old-style irq entry
2021-12-06 12:49:11 +01:00
isa.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
iwmmxt.h
ARM: 9029/1: Make iwmmxt.S support Clang's integrated assembler
2020-12-08 10:14:59 +00:00
iwmmxt.S
ARM: 9029/1: Make iwmmxt.S support Clang's integrated assembler
2020-12-08 10:14:59 +00:00
jump_label.c
jump_label: move 'asm goto' support test to Kconfig
2019-01-06 09:46:51 +09:00
kgdb.c
maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault
2020-06-17 10:57:41 -07:00
machine_kexec.c
ARM: 9060/1: kexec: Remove unused kexec_reinit callback
2021-03-09 10:25:35 +00:00
Makefile
ARM updates for 5.11:
2020-12-22 13:34:27 -08:00
module-plts.c
ARM: 9098/1: ftrace: MODULE_PLT: Fix build problem without DYNAMIC_FTRACE
2021-07-05 11:52:26 +01:00
module.c
ARM: assembler: define a Kconfig symbol for group relocation support
2022-01-24 21:02:34 +01:00
opcodes.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
paravirt.c
x86/paravirt: Switch time pvops functions to use static_call()
2021-03-11 16:17:52 +01:00
patch.c
arm/patch: Fix !MMU compile
2020-02-11 12:56:27 +01:00
perf_callchain.c
Remove 'type' argument from access_ok() function
2019-01-03 18:57:57 -08:00
perf_event_v6.c
arm_pmu: Tidy up clear_event_idx call backs
2018-07-10 18:19:02 +01:00
perf_event_v7.c
arm_pmu: Fix write counter incorrect in ARMv7 big-endian mode
2021-06-01 14:17:01 +01:00
perf_event_xscale.c
arm_pmu: Tidy up clear_event_idx call backs
2018-07-10 18:19:02 +01:00
perf_regs.c
perf/arch: Remove perf_sample_data::regs_user_copy
2020-11-09 18:12:34 +01:00
phys2virt.S
ARM: p2v: reduce p2v alignment requirement to 2 MiB
2020-10-28 16:59:43 +01:00
pj4-cp0.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
process.c
ARM: implement THREAD_INFO_IN_TASK for uniprocessor systems
2021-12-06 12:49:17 +01:00
psci_smp.c
ARM: 8919/1: make unexported functions static
2019-10-31 16:58:52 +00:00
ptrace.c
ARM development updates for 5.15:
2021-09-09 13:25:49 -07:00
reboot.c
ARM: 9096/1: Remove arm_pm_restart()
2021-06-13 18:16:48 +01:00
reboot.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
relocate_kernel.S
ARM: kexec: fix oops after TLB are invalidated
2021-02-05 10:23:29 +00:00
return_address.c
ARM: Recover kretprobe modified return address in stacktrace
2021-10-22 12:16:53 -04:00
setup.c
ARM: implement support for vmap'ed stacks
2021-12-03 15:11:33 +01:00
signal.c
entry: rseq: Call rseq_handle_notify_resume() in tracehook_notify_resume()
2021-09-22 10:24:01 -04:00
signal.h
ARM: 8920/1: share get_signal_page from signal.c to process.c
2019-10-31 16:58:53 +00:00
sigreturn_codes.S
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174
2019-05-30 11:26:41 -07:00
sleep.S
ARM: mm: switch to swapper_pg_dir early for vmap'ed stack
2022-01-24 20:37:55 +01:00
smccc-call.S
ARM: 9075/1: kernel: Fix interrupted SMC calls
2021-04-18 19:15:14 +01:00
smp_scu.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
smp_tlb.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
smp_twd.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
smp.c
ARM: drop pointless SMP check on secondary startup path
2022-01-25 09:53:52 +01:00
stacktrace.c
ARM: Recover kretprobe modified return address in stacktrace
2021-10-22 12:16:53 -04:00
suspend.c
ARM: 9066/1: ftrace: pause/unpause function graph tracer in cpu_suspend()
2021-03-25 10:27:42 +00:00
swp_emulate.c
mmap locking API: use coccinelle to convert mmap_sem rwsem call sites
2020-06-09 09:39:14 -07:00
sys_arm.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
sys_oabi-compat.c
ARM: 9110/1: oabi-compat: fix oabi epoll sparse warning
2021-08-20 11:39:27 +01:00
tcm.c
ARM: 8925/1: tcm: include <asm/tcm.h> for missing declarations
2019-10-31 16:58:56 +00:00
thumbee.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333
2019-06-05 17:37:06 +02:00
time.c
ARM: rpc: use legacy_timer_tick
2020-10-30 21:57:05 +01:00
topology.c
ARM, sched/topology: Revert back to default scheduler topology
2020-08-19 10:49:47 +02:00
traps.c
ARM: mm: make vmalloc_seq handling SMP safe
2022-01-25 09:53:52 +01:00
unwind.c
ARM: implement support for vmap'ed stacks
2021-12-03 15:11:33 +01:00
v7m.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
vdso.c
mm: forbid splitting special mappings
2020-12-15 12:13:41 -08:00
vmlinux-xip.lds.S
Merge branches 'devel-stable' and 'misc' into for-linus
2021-11-02 09:04:22 +00:00
vmlinux.lds.S
ARM: implement support for vmap'ed stacks
2021-12-03 15:11:33 +01:00
xscale-cp0.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00