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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/include/asm/assembler.h | |
| parent | 50596b7559bf226bb35ad55855ee979453ec06a1 (diff) | |
| download | linux-18ed1c01a7dd3d7c780b06a49124da237a4c1790.tar.gz linux-18ed1c01a7dd3d7c780b06a49124da237a4c1790.tar.bz2 linux-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 'arch/arm/include/asm/assembler.h')
| -rw-r--r-- | arch/arm/include/asm/assembler.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/arm/include/asm/assembler.h b/arch/arm/include/asm/assembler.h index c1551dee28be..7d23d4bb2168 100644 --- a/arch/arm/include/asm/assembler.h +++ b/arch/arm/include/asm/assembler.h @@ -227,10 +227,15 @@ * Get current thread_info. */ .macro get_thread_info, rd +#ifdef CONFIG_THREAD_INFO_IN_TASK + /* thread_info is the first member of struct task_struct */ + get_current \rd +#else ARM( mov \rd, sp, lsr #THREAD_SIZE_ORDER + PAGE_SHIFT ) THUMB( mov \rd, sp ) THUMB( lsr \rd, \rd, #THREAD_SIZE_ORDER + PAGE_SHIFT ) mov \rd, \rd, lsl #THREAD_SIZE_ORDER + PAGE_SHIFT +#endif .endm /* |