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riscv: simplify the stack pointer setup in head.S 

We don't need THREAD_SIZE in asm-offsets.c as we can just calculate
the value of init_thread_union + THREAD_SIZE using cpp, just like
we do a few lines above.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Christoph Hellwig 2019-04-15 11:14:37 +02:00 committed by Palmer Dabbelt
parent df16c40cbf
commit c637b911e0
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2 changed files with 1 additions and 7 deletions
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3
arch/riscv/kernel/asm-offsets.c
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@ -312,9 +312,6 @@ void asm_offsets(void)
- offsetof(struct task_struct, thread.fstate.f[0]) - offsetof(struct task_struct, thread.fstate.f[0])
); );
/* The assembler needs access to THREAD_SIZE as well. */
DEFINE(ASM_THREAD_SIZE, THREAD_SIZE);
/* /*
* We allocate a pt_regs on the stack when entering the kernel. This * We allocate a pt_regs on the stack when entering the kernel. This
* ensures the alignment is sane. * ensures the alignment is sane.

5
arch/riscv/kernel/head.S
View File

@ -69,10 +69,7 @@ clear_bss_done:
/* Restore C environment */ /* Restore C environment */
la tp, init_task la tp, init_task
sw zero, TASK_TI_CPU(tp) sw zero, TASK_TI_CPU(tp)
la sp, init_thread_union + THREAD_SIZE
la sp, init_thread_union
li a0, ASM_THREAD_SIZE
add sp, sp, a0
/* Start the kernel */ /* Start the kernel */
mv a0, s0 mv a0, s0