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| author |   Ard Biesheuvel <ardb@kernel.org> | 2021-09-18 10:44:38 +0200 |
|---|---|---|
| committer | Ard Biesheuvel <ardb@kernel.org> | 2021-09-27 16:54:02 +0200 |
| commit | 18ed1c01a7dd3d7c780b06a49124da237a4c1790 (patch) | |
| tree | 5145998327a1a3a6e48a9432a9846b2ba73f8848 /arch/arm/kernel/smp.c | |
| parent | ARM: smp: Store current pointer in TPIDRURO register if available (diff) | |
| download | linux-dev-18ed1c01a7dd3d7c780b06a49124da237a4c1790.tar.xz linux-dev-18ed1c01a7dd3d7c780b06a49124da237a4c1790.zip | |
ARM: smp: Enable THREAD_INFO_IN_TASK
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>
Diffstat (limited to '')
| -rw-r--r-- | arch/arm/kernel/smp.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index 97ee6b1567e9..cde5b6d8bac5 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -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); /* |