diff options
| author | Jinyang He <hejinyang@loongson.cn> | 2022-10-29 16:29:31 +0800 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2022-10-29 16:29:31 +0800 |
| commit | b40fa75e1542e069a4eb9b33d62061d4ae734537 (patch) | |
| tree | 42b4675b92d528242d7252012d482a84d772622e /arch/loongarch/kernel | |
| parent | 247f34f7b80357943234f93f247a1ae6b6c3a740 (diff) | |
LoongArch: Remove unused kernel stack padding
The current LoongArch kernel stack is padded as if obeying the MIPS o32
calling convention (32 bytes), signifying the port's MIPS lineage but no
longer making sense. Remove the padding for clarity.
Reviewed-by: WANG Xuerui <git@xen0n.name>
Signed-off-by: Jinyang He <hejinyang@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch/kernel')
| -rw-r--r-- | arch/loongarch/kernel/head.S | 3 | ||||
| -rw-r--r-- | arch/loongarch/kernel/process.c | 4 | ||||
| -rw-r--r-- | arch/loongarch/kernel/switch.S | 2 |
3 files changed, 4 insertions, 5 deletions
diff --git a/arch/loongarch/kernel/head.S b/arch/loongarch/kernel/head.S index 97425779ce9f..84970e266658 100644 --- a/arch/loongarch/kernel/head.S +++ b/arch/loongarch/kernel/head.S @@ -84,10 +84,9 @@ SYM_CODE_START(kernel_entry) # kernel entry point la.pcrel tp, init_thread_union /* Set the SP after an empty pt_regs. */ - PTR_LI sp, (_THREAD_SIZE - 32 - PT_SIZE) + PTR_LI sp, (_THREAD_SIZE - PT_SIZE) PTR_ADD sp, sp, tp set_saved_sp sp, t0, t1 - PTR_ADDI sp, sp, -4 * SZREG # init stack pointer bl start_kernel ASM_BUG() diff --git a/arch/loongarch/kernel/process.c b/arch/loongarch/kernel/process.c index 1256e3582475..2526b68f1c0f 100644 --- a/arch/loongarch/kernel/process.c +++ b/arch/loongarch/kernel/process.c @@ -129,7 +129,7 @@ int copy_thread(struct task_struct *p, const struct kernel_clone_args *args) unsigned long clone_flags = args->flags; struct pt_regs *childregs, *regs = current_pt_regs(); - childksp = (unsigned long)task_stack_page(p) + THREAD_SIZE - 32; + childksp = (unsigned long)task_stack_page(p) + THREAD_SIZE; /* set up new TSS. */ childregs = (struct pt_regs *) childksp - 1; @@ -236,7 +236,7 @@ bool in_task_stack(unsigned long stack, struct task_struct *task, struct stack_info *info) { unsigned long begin = (unsigned long)task_stack_page(task); - unsigned long end = begin + THREAD_SIZE - 32; + unsigned long end = begin + THREAD_SIZE; if (stack < begin || stack >= end) return false; diff --git a/arch/loongarch/kernel/switch.S b/arch/loongarch/kernel/switch.S index 43ebbc3990f7..202a163cb32f 100644 --- a/arch/loongarch/kernel/switch.S +++ b/arch/loongarch/kernel/switch.S @@ -26,7 +26,7 @@ SYM_FUNC_START(__switch_to) move tp, a2 cpu_restore_nonscratch a1 - li.w t0, _THREAD_SIZE - 32 + li.w t0, _THREAD_SIZE PTR_ADD t0, t0, tp set_saved_sp t0, t1, t2 |