Release 4.9 arch/x86/include/asm/switch_to.h
#ifndef _ASM_X86_SWITCH_TO_H
#define _ASM_X86_SWITCH_TO_H
struct task_struct; /* one of the stranger aspects of C forward declarations */
struct task_struct *__switch_to_asm(struct task_struct *prev,
struct task_struct *next);
__visible struct task_struct *__switch_to(struct task_struct *prev,
struct task_struct *next);
struct tss_struct;
void __switch_to_xtra(struct task_struct *prev_p, struct task_struct *next_p,
struct tss_struct *tss);
/* This runs runs on the previous thread's stack. */
static inline void prepare_switch_to(struct task_struct *prev,
struct task_struct *next)
{
#ifdef CONFIG_VMAP_STACK
/*
* If we switch to a stack that has a top-level paging entry
* that is not present in the current mm, the resulting #PF will
* will be promoted to a double-fault and we'll panic. Probe
* the new stack now so that vmalloc_fault can fix up the page
* tables if needed. This can only happen if we use a stack
* in vmap space.
*
* We assume that the stack is aligned so that it never spans
* more than one top-level paging entry.
*
* To minimize cache pollution, just follow the stack pointer.
*/
READ_ONCE(*(unsigned char *)next->thread.sp);
#endif
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| andy lutomirski | andy lutomirski | 38 | 100.00% | 1 | 100.00% |
| Total | 38 | 100.00% | 1 | 100.00% |
asmlinkage void ret_from_fork(void);
/* data that is pointed to by thread.sp */
struct inactive_task_frame {
#ifdef CONFIG_X86_64
unsigned long r15;
unsigned long r14;
unsigned long r13;
unsigned long r12;
#else
unsigned long si;
unsigned long di;
#endif
unsigned long bx;
unsigned long bp;
unsigned long ret_addr;
};
struct fork_frame {
struct inactive_task_frame frame;
struct pt_regs regs;
};
#define switch_to(prev, next, last) \
do { \
prepare_switch_to(prev, next); \
\
((last) = __switch_to_asm((prev), (next))); \
} while (0)
#endif /* _ASM_X86_SWITCH_TO_H */
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| brian gerst | brian gerst | 86 | 45.74% | 3 | 50.00% |
| david howells | david howells | 62 | 32.98% | 1 | 16.67% |
| andy lutomirski | andy lutomirski | 39 | 20.74% | 1 | 16.67% |
| andi kleen | andi kleen | 1 | 0.53% | 1 | 16.67% |
| Total | 188 | 100.00% | 6 | 100.00% |