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ARM: smp: Enable THREAD_INFO_IN_TASK

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Now that we no longer rely on thread_info living at the base of the task
stack to be able to access the 'current' pointer, we can wire up the
generic support for moving thread_info into the task struct itself.

Note that this requires us to update the cpu field in thread_info
explicitly, now that the core code no longer does so. Ideally, we would
switch the percpu code to access the cpu field in task_struct instead,
but this unleashes #include circular dependency hell.

Co-developed-by: Keith Packard <keithpac@amazon.com>
Signed-off-by: Keith Packard <keithpac@amazon.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Amit Daniel Kachhap <amit.kachhap@arm.com>
This commit is contained in:
Ard Biesheuvel
2021-09-18 10:44:38 +02:00
parent 50596b7559
commit 18ed1c01a7
7 changed files with 35 additions and 2 deletions
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3
arch/arm/kernel/smp.c
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@@ -154,6 +154,9 @@ 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);
/*