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sparc32: get rid of fake_swapper_regs

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no reason to have ->kregs of initial thread set up in a special
way - we can keep them on stack, same as for every other thread.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-08-19 18:05:02 -04:00
parent d17b9ec777
commit af7652500b
4 changed files with 3 additions and 12 deletions
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1
arch/sparc/include/asm/processor_32.h
View File

@ -60,6 +60,7 @@ struct thread_struct {
#define INIT_THREAD { \ #define INIT_THREAD { \
.flags = SPARC_FLAG_KTHREAD, \ .flags = SPARC_FLAG_KTHREAD, \
.current_ds = KERNEL_DS, \ .current_ds = KERNEL_DS, \
.kregs = (struct pt_regs *)(init_stack+THREAD_SIZE)-1 \
} }
/* Do necessary setup to start up a newly executed thread. */ /* Do necessary setup to start up a newly executed thread. */

2
arch/sparc/kernel/head_32.S
View File

@ -515,7 +515,7 @@ continue_boot:
/* I want a kernel stack NOW! */ /* I want a kernel stack NOW! */
set init_thread_union, %g1 set init_thread_union, %g1
set (THREAD_SIZE - STACKFRAME_SZ), %g2 set (THREAD_SIZE - STACKFRAME_SZ - TRACEREG_SZ), %g2
add %g1, %g2, %sp add %g1, %g2, %sp
mov 0, %fp /* And for good luck */ mov 0, %fp /* And for good luck */

9
arch/sparc/kernel/process_32.c
View File

@ -218,14 +218,7 @@ void flush_thread(void)
} }
/* This task is no longer a kernel thread. */ /* This task is no longer a kernel thread. */
if (current->thread.flags & SPARC_FLAG_KTHREAD) { current->thread.flags &= ~SPARC_FLAG_KTHREAD;
current->thread.flags &= ~SPARC_FLAG_KTHREAD;
/* We must fixup kregs as well. */
/* XXX This was not fixed for ti for a while, worked. Unused? */
current->thread.kregs = (struct pt_regs *)
(task_stack_page(current) + (THREAD_SIZE - TRACEREG_SZ));
}
} }
static inline struct sparc_stackf __user * static inline struct sparc_stackf __user *

3
arch/sparc/kernel/setup_32.c
View File

@ -266,7 +266,6 @@ static __init void leon_patch(void)
} }
struct tt_entry *sparc_ttable; struct tt_entry *sparc_ttable;
static struct pt_regs fake_swapper_regs;
/* Called from head_32.S - before we have setup anything /* Called from head_32.S - before we have setup anything
* in the kernel. Be very careful with what you do here. * in the kernel. Be very careful with what you do here.
@ -363,8 +362,6 @@ void __init setup_arch(char **cmdline_p)
(*(linux_dbvec->teach_debugger))(); (*(linux_dbvec->teach_debugger))();
} }
init_task.thread.kregs = &fake_swapper_regs;
/* Run-time patch instructions to match the cpu model */ /* Run-time patch instructions to match the cpu model */
per_cpu_patch(); per_cpu_patch();