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Construct init thread stack in the linker script rather than by union

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Construct the init thread stack in the linker script rather than doing it
by means of a union so that ia64's init_task.c can be got rid of.

The following symbols are then made available from INIT_TASK_DATA() linker
script macro:

	init_thread_union
	init_stack

INIT_TASK_DATA() also expands the region to THREAD_SIZE to accommodate the
size of the init stack.  init_thread_union is given its own section so that
it can be placed into the stack space in the right order.  I'm assuming
that the ia64 ordering is correct and that the task_struct is first and the
thread_info second.

Signed-off-by: David Howells <[email protected]>
Tested-by: Tony Luck <[email protected]>
Tested-by: Will Deacon <[email protected]> (arm64)
Tested-by: Palmer Dabbelt <[email protected]>
Acked-by: Thomas Gleixner <[email protected]>
This commit is contained in:
David Howells 2018-01-02 15:12:01 +00:00
commit 0500871f21
50 changed files with 42 additions and 155 deletions
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4
arch/Kconfig
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@ -234,8 +234,8 @@ config ARCH_HAS_FORTIFY_SOURCE
config ARCH_HAS_SET_MEMORY
bool
# Select if arch init_task initializer is different to init/init_task.c
config ARCH_INIT_TASK
# Select if arch init_task must go in the __init_task_data section
config ARCH_TASK_STRUCT_ON_STACK
bool
# Select if arch has its private alloc_task_struct() function