mirror of
https://github.com/brain-hackers/linux-brain.git
synced 2024-06-09 15:26:21 +09:00
0994a2cf8f
Kaiser only needs to map one page of the stack; and kernel/fork.c did not build on powerpc (no __PAGE_KERNEL). It's all cleaner if linux/kaiser.h provides kaiser_map_thread_stack() and kaiser_unmap_thread_stack() wrappers around asm/kaiser.h's kaiser_add_mapping() and kaiser_remove_mapping(). And use linux/kaiser.h in init/main.c to avoid the #ifdefs there. Signed-off-by: Hugh Dickins <hughd@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
53 lines
1.1 KiB
C
53 lines
1.1 KiB
C
#ifndef _LINUX_KAISER_H
|
|
#define _LINUX_KAISER_H
|
|
|
|
#ifdef CONFIG_KAISER
|
|
#include <asm/kaiser.h>
|
|
|
|
static inline int kaiser_map_thread_stack(void *stack)
|
|
{
|
|
/*
|
|
* Map that page of kernel stack on which we enter from user context.
|
|
*/
|
|
return kaiser_add_mapping((unsigned long)stack +
|
|
THREAD_SIZE - PAGE_SIZE, PAGE_SIZE, __PAGE_KERNEL);
|
|
}
|
|
|
|
static inline void kaiser_unmap_thread_stack(void *stack)
|
|
{
|
|
/*
|
|
* Note: may be called even when kaiser_map_thread_stack() failed.
|
|
*/
|
|
kaiser_remove_mapping((unsigned long)stack +
|
|
THREAD_SIZE - PAGE_SIZE, PAGE_SIZE);
|
|
}
|
|
#else
|
|
|
|
/*
|
|
* These stubs are used whenever CONFIG_KAISER is off, which
|
|
* includes architectures that support KAISER, but have it disabled.
|
|
*/
|
|
|
|
static inline void kaiser_init(void)
|
|
{
|
|
}
|
|
static inline int kaiser_add_mapping(unsigned long addr,
|
|
unsigned long size, unsigned long flags)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void kaiser_remove_mapping(unsigned long start,
|
|
unsigned long size)
|
|
{
|
|
}
|
|
static inline int kaiser_map_thread_stack(void *stack)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void kaiser_unmap_thread_stack(void *stack)
|
|
{
|
|
}
|
|
|
|
#endif /* !CONFIG_KAISER */
|
|
#endif /* _LINUX_KAISER_H */
|