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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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5
arch/arm/include/asm/assembler.h
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@@ -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
/*