diff options
| author | Jisheng Zhang <jszhang@kernel.org> | 2023-02-21 22:30:20 -0500 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2023-03-23 08:47:02 -0700 |
| commit | ab9164dae27334415537ccf1c3fbabf56b7793b2 (patch) | |
| tree | c378c18fa04b5d9fe23d0865a227fb76f708ec6c /arch/riscv/kernel/entry.S | |
| parent | 0bf298ad2b61ae69d38826f3513e5fffc3fe3a53 (diff) | |
riscv: entry: Consolidate ret_from_kernel_thread into ret_from_fork
The ret_from_kernel_thread() behaves similarly with ret_from_fork(),
the only difference is whether call the fn(arg) or not, this can be
achieved by testing fn is NULL or not, I.E s0 is 0 or not. Many
architectures have done the same thing, it makes entry.S more clean.
Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Reviewed-by: Björn Töpel <bjorn@rivosinc.com>
Reviewed-by: Guo Ren <guoren@kernel.org>
Tested-by: Guo Ren <guoren@kernel.org>
Signed-off-by: Guo Ren <guoren@kernel.org>
Link: https://lore.kernel.org/r/20230222033021.983168-7-guoren@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch/riscv/kernel/entry.S')
| -rw-r--r-- | arch/riscv/kernel/entry.S | 12 |
1 files changed, 3 insertions, 9 deletions
diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S index bc322f92ba34..5ccef259498d 100644 --- a/arch/riscv/kernel/entry.S +++ b/arch/riscv/kernel/entry.S @@ -132,7 +132,6 @@ SYM_CODE_END(handle_exception) * caller list: * - handle_exception * - ret_from_fork - * - ret_from_kernel_thread */ SYM_CODE_START_NOALIGN(ret_from_exception) REG_L s0, PT_STATUS(sp) @@ -334,20 +333,15 @@ SYM_CODE_END(handle_kernel_stack_overflow) SYM_CODE_START(ret_from_fork) call schedule_tail - move a0, sp /* pt_regs */ - la ra, ret_from_exception - tail syscall_exit_to_user_mode -SYM_CODE_END(ret_from_fork) - -SYM_CODE_START(ret_from_kernel_thread) - call schedule_tail + beqz s0, 1f /* not from kernel thread */ /* Call fn(arg) */ move a0, s1 jalr s0 +1: move a0, sp /* pt_regs */ la ra, ret_from_exception tail syscall_exit_to_user_mode -SYM_CODE_END(ret_from_kernel_thread) +SYM_CODE_END(ret_from_fork) /* * Integer register context switch |