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xtensa: consolidate kernel stack size related definitions 

Define kernel stack size in kmem_layout and use it in
current_thread_info, GET_THREAD_INFO, THREAD_SIZE and THERAD_SIZE_ORDER
definitions.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2017-12-04 10:47:43 -08:00
parent 5cf97ebd8b
commit f4431396be
4 changed files with 13 additions and 10 deletions
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4
arch/xtensa/include/asm/current.h
View File

@ -11,6 +11,8 @@
#ifndef _XTENSA_CURRENT_H
#define _XTENSA_CURRENT_H
#include <asm/thread_info.h>
#ifndef __ASSEMBLY__
#include <linux/thread_info.h>
@ -26,8 +28,6 @@ static inline struct task_struct *get_current(void)
#else
#define CURRENT_SHIFT 13
#define GET_CURRENT(reg,sp) \
GET_THREAD_INFO(reg,sp); \
l32i reg, reg, TI_TASK \

3
arch/xtensa/include/asm/kmem_layout.h
View File

@ -71,4 +71,7 @@
#endif
#define KERNEL_STACK_SHIFT 13
#define KERNEL_STACK_SIZE (1 << KERNEL_STACK_SHIFT)
#endif

3
arch/xtensa/include/asm/ptrace.h
View File

@ -10,6 +10,7 @@
#ifndef _XTENSA_PTRACE_H
#define _XTENSA_PTRACE_H
#include <asm/kmem_layout.h>
#include <uapi/asm/ptrace.h>
/*
@ -38,8 +39,6 @@
* +-----------------------+ --------
*/
#define KERNEL_STACK_SIZE (2 * PAGE_SIZE)
/* Offsets for exception_handlers[] (3 x 64-entries x 4-byte tables). */
#define EXC_TABLE_KSTK 0x004 /* Kernel Stack */

13
arch/xtensa/include/asm/thread_info.h
View File

@ -11,7 +11,9 @@
#ifndef _XTENSA_THREAD_INFO_H
#define _XTENSA_THREAD_INFO_H
#ifdef __KERNEL__
#include <asm/kmem_layout.h>
#define CURRENT_SHIFT KERNEL_STACK_SHIFT
#ifndef __ASSEMBLY__
# include <asm/processor.h>
@ -84,7 +86,7 @@ struct thread_info {
static inline struct thread_info *current_thread_info(void)
{
struct thread_info *ti;
__asm__("extui %0,a1,0,13\n\t"
__asm__("extui %0, a1, 0, "__stringify(CURRENT_SHIFT)"\n\t"
"xor %0, a1, %0" : "=&r" (ti) : );
return ti;
}
@ -93,7 +95,7 @@ static inline struct thread_info *current_thread_info(void)
/* how to get the thread information struct from ASM */
#define GET_THREAD_INFO(reg,sp) \
extui reg, sp, 0, 13; \
extui reg, sp, 0, CURRENT_SHIFT; \
xor reg, sp, reg
#endif
@ -130,8 +132,7 @@ static inline struct thread_info *current_thread_info(void)
*/
#define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */
#define THREAD_SIZE 8192 //(2*PAGE_SIZE)
#define THREAD_SIZE_ORDER 1
#define THREAD_SIZE KERNEL_STACK_SIZE
#define THREAD_SIZE_ORDER (KERNEL_STACK_SHIFT - PAGE_SHIFT)
#endif /* __KERNEL__ */
#endif /* _XTENSA_THREAD_INFO */