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riscv: Cleanup unnecessary define in asm-offset.c 

- TASK_THREAD_SP is duplicated define
 - TASK_STACK is no use at all
 - Don't worry about thread_info's offset in task_struct, have
   a look on comment in include/linux/sched.h:

struct task_struct {
	/*
	 * For reasons of header soup (see current_thread_info()), this
	 * must be the first element of task_struct.
	 */
	struct thread_info		thread_info;

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Guo Ren 2020-07-12 13:41:49 +00:00 committed by Palmer Dabbelt
parent ebc00dde8a
commit 3e7b669c6c
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GPG Key ID: 2E1319F35FBB1889
2 changed files with 1 additions and 8 deletions
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3
arch/riscv/kernel/asm-offsets.c
View File

@ -27,9 +27,6 @@ void asm_offsets(void)
OFFSET(TASK_THREAD_S9, task_struct, thread.s[9]);
OFFSET(TASK_THREAD_S10, task_struct, thread.s[10]);
OFFSET(TASK_THREAD_S11, task_struct, thread.s[11]);
OFFSET(TASK_THREAD_SP, task_struct, thread.sp);
OFFSET(TASK_STACK, task_struct, stack);
OFFSET(TASK_TI, task_struct, thread_info);
OFFSET(TASK_TI_FLAGS, task_struct, thread_info.flags);
OFFSET(TASK_TI_PREEMPT_COUNT, task_struct, thread_info.preempt_count);
OFFSET(TASK_TI_KERNEL_SP, task_struct, thread_info.kernel_sp);

6
arch/riscv/kernel/entry.S
View File

@ -435,12 +435,8 @@ ENTRY(__switch_to)
lw a4, TASK_TI_CPU(a1)
sw a3, TASK_TI_CPU(a1)
sw a4, TASK_TI_CPU(a0)
#if TASK_TI != 0
#error "TASK_TI != 0: tp will contain a 'struct thread_info', not a 'struct task_struct' so get_current() won't work."
addi tp, a1, TASK_TI
#else
/* The offset of thread_info in task_struct is zero. */
move tp, a1
#endif
ret
ENDPROC(__switch_to)