mirror of
https://github.com/tbsdtv/linux_media.git
synced 2025-07-23 04:33:26 +02:00
9c0e6a89b5
Pull ARM updates from Russell King:
"Updates for IRQ stacks and virtually mapped stack support, and ftrace:
- Support for IRQ and vmap'ed stacks
This covers all the work related to implementing IRQ stacks and
vmap'ed stacks for all 32-bit ARM systems that are currently
supported by the Linux kernel, including RiscPC and Footbridge. It
has been submitted for review in four different waves:
- IRQ stacks support for v7 SMP systems [0]
- vmap'ed stacks support for v7 SMP systems[1]
- extending support for both IRQ stacks and vmap'ed stacks for all
remaining configurations, including v6/v7 SMP multiplatform
kernels and uniprocessor configurations including v7-M [2]
- fixes and updates in [3]
- ftrace fixes and cleanups
Make all flavors of ftrace available on all builds, regardless of
ISA choice, unwinder choice or compiler [4]:
- use ADD not POP where possible
- fix a couple of Thumb2 related issues
- enable HAVE_FUNCTION_GRAPH_FP_TEST for robustness
- enable the graph tracer with the EABI unwinder
- avoid clobbering frame pointer registers to make Clang happy
- Fixes for the above"
[0] https://lore.kernel.org/linux-arm-kernel/20211115084732.3704393-1-ardb@kernel.org/
[1] https://lore.kernel.org/linux-arm-kernel/20211122092816.2865873-1-ardb@kernel.org/
[2] https://lore.kernel.org/linux-arm-kernel/20211206164659.1495084-1-ardb@kernel.org/
[3] https://lore.kernel.org/linux-arm-kernel/20220124174744.1054712-1-ardb@kernel.org/
[4] https://lore.kernel.org/linux-arm-kernel/20220203082204.1176734-1-ardb@kernel.org/
* tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm: (62 commits)
ARM: fix building NOMMU ARMv4/v5 kernels
ARM: unwind: only permit stack switch when unwinding call_with_stack()
ARM: Revert "unwind: dump exception stack from calling frame"
ARM: entry: fix unwinder problems caused by IRQ stacks
ARM: unwind: set frame.pc correctly for current-thread unwinding
ARM: 9184/1: return_address: disable again for CONFIG_ARM_UNWIND=y
ARM: 9183/1: unwind: avoid spurious warnings on bogus code addresses
Revert "ARM: 9144/1: forbid ftrace with clang and thumb2_kernel"
ARM: mach-bcm: disable ftrace in SMC invocation routines
ARM: cacheflush: avoid clobbering the frame pointer
ARM: kprobes: treat R7 as the frame pointer register in Thumb2 builds
ARM: ftrace: enable the graph tracer with the EABI unwinder
ARM: unwind: track location of LR value in stack frame
ARM: ftrace: enable HAVE_FUNCTION_GRAPH_FP_TEST
ARM: ftrace: avoid unnecessary literal loads
ARM: ftrace: avoid redundant loads or clobbering IP
ARM: ftrace: use trampolines to keep .init.text in branching range
ARM: ftrace: use ADD not POP to counter PUSH at entry
ARM: ftrace: ensure that ADR takes the Thumb bit into account
ARM: make get_current() and __my_cpu_offset() __always_inline
...
36 lines
1.2 KiB
C
36 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __ASM_ARM_SWITCH_TO_H
|
|
#define __ASM_ARM_SWITCH_TO_H
|
|
|
|
#include <linux/thread_info.h>
|
|
#include <asm/smp_plat.h>
|
|
|
|
/*
|
|
* For v7 SMP cores running a preemptible kernel we may be pre-empted
|
|
* during a TLB maintenance operation, so execute an inner-shareable dsb
|
|
* to ensure that the maintenance completes in case we migrate to another
|
|
* CPU.
|
|
*/
|
|
#if defined(CONFIG_PREEMPTION) && defined(CONFIG_SMP) && defined(CONFIG_CPU_V7)
|
|
#define __complete_pending_tlbi() dsb(ish)
|
|
#else
|
|
#define __complete_pending_tlbi()
|
|
#endif
|
|
|
|
/*
|
|
* switch_to(prev, next) should switch from task `prev' to `next'
|
|
* `prev' will never be the same as `next'. schedule() itself
|
|
* contains the memory barrier to tell GCC not to cache `current'.
|
|
*/
|
|
extern struct task_struct *__switch_to(struct task_struct *, struct thread_info *, struct thread_info *);
|
|
|
|
#define switch_to(prev,next,last) \
|
|
do { \
|
|
__complete_pending_tlbi(); \
|
|
if (IS_ENABLED(CONFIG_CURRENT_POINTER_IN_TPIDRURO) || is_smp()) \
|
|
__this_cpu_write(__entry_task, next); \
|
|
last = __switch_to(prev,task_thread_info(prev), task_thread_info(next)); \
|
|
} while (0)
|
|
|
|
#endif /* __ASM_ARM_SWITCH_TO_H */
|