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| author |   Ard Biesheuvel <ardb@kernel.org> | 2021-11-15 08:57:12 +0100 |
|---|---|---|
| committer |   Russell King (Oracle) <rmk+kernel@armlinux.org.uk> | 2021-12-17 11:34:31 +0000 |
| commit | 4a2f57ac7dada84224d71fe895580990b9062d68 (patch) | |
| tree | 14f191ad9e2dc20607a4606b2f4789e0946c69f5 | |
| parent | ARM: 9154/1: decompressor: do not copy source files while building (diff) | |
| download | linux-dev-4a2f57ac7dada84224d71fe895580990b9062d68.tar.xz linux-dev-4a2f57ac7dada84224d71fe895580990b9062d68.zip | |
ARM: 9158/1: leave it to core code to manage thread_info::cpu
Since commit bcf9033e5449 ("sched: move CPU field back into thread_info
if THREAD_INFO_IN_TASK=y"), the CPU field in thread_info went back to
being managed by the core code, so we no longer have to keep it in sync
in arch code.
While at it, mark THREAD_INFO_IN_TASK as done for ARM in the
documentation.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
| -rw-r--r-- | Documentation/features/core/thread-info-in-task/arch-support.txt | 2 | ||||
| -rw-r--r-- | arch/arm/include/asm/switch_to.h | 14 | ||||
| -rw-r--r-- | arch/arm/kernel/smp.c | 3 |
3 files changed, 1 insertions, 18 deletions
diff --git a/Documentation/features/core/thread-info-in-task/arch-support.txt b/Documentation/features/core/thread-info-in-task/arch-support.txt index 3361e86b0958..bc74d8beea72 100644 --- a/Documentation/features/core/thread-info-in-task/arch-support.txt +++ b/Documentation/features/core/thread-info-in-task/arch-support.txt @@ -8,7 +8,7 @@ ----------------------- | alpha: | TODO | | arc: | TODO | - | arm: | TODO | + | arm: | ok | | arm64: | ok | | csky: | TODO | | h8300: | TODO | diff --git a/arch/arm/include/asm/switch_to.h b/arch/arm/include/asm/switch_to.h index b55c7b2755e4..61e4a3c4ca6e 100644 --- a/arch/arm/include/asm/switch_to.h +++ b/arch/arm/include/asm/switch_to.h @@ -23,23 +23,9 @@ */ extern struct task_struct *__switch_to(struct task_struct *, struct thread_info *, struct thread_info *); -static inline void set_ti_cpu(struct task_struct *p) -{ -#ifdef CONFIG_THREAD_INFO_IN_TASK - /* - * The core code no longer maintains the thread_info::cpu field once - * CONFIG_THREAD_INFO_IN_TASK is in effect, but we rely on it for - * raw_smp_processor_id(), which cannot access struct task_struct* - * directly for reasons of circular #inclusion hell. - */ - task_thread_info(p)->cpu = task_cpu(p); -#endif -} - #define switch_to(prev,next,last) \ do { \ __complete_pending_tlbi(); \ - set_ti_cpu(next); \ if (IS_ENABLED(CONFIG_CURRENT_POINTER_IN_TPIDRURO)) \ __this_cpu_write(__entry_task, next); \ last = __switch_to(prev,task_thread_info(prev), task_thread_info(next)); \ diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index cde5b6d8bac5..97ee6b1567e9 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -154,9 +154,6 @@ int __cpu_up(unsigned int cpu, struct task_struct *idle) secondary_data.swapper_pg_dir = get_arch_pgd(swapper_pg_dir); #endif secondary_data.task = idle; - if (IS_ENABLED(CONFIG_THREAD_INFO_IN_TASK)) - task_thread_info(idle)->cpu = cpu; - sync_cache_w(&secondary_data); /* |