xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[PATCH] m68k: convert thread flags to use bit fields

Browse Source 
Remove task_work structure, use the standard thread flags functions and use
shifts in entry.S to test the thread flags.  Add a few local labels to entry.S
to allow gas to generate short jumps.

Finally it changes a number of inline functions in thread_info.h to macros to
delay the current_thread_info() usage, which requires on m68k a structure
(task_struct) not yet defined at this point.

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Cc: Al Viro <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Roman Zippel
2005-11-13 16:06:59 -08:00
committed by Linus Torvalds
parent abd03753bd
commit 3b66a1edb0
8 changed files with 71 additions and 177 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
include/asm-m68k/processor.h
View File

@@ -56,17 +56,6 @@ static inline void wrusp(unsigned long usp)
#endif
#define TASK_UNMAPPED_ALIGN(addr, off) PAGE_ALIGN(addr)
struct task_work {
unsigned char sigpending;
unsigned char notify_resume; /* request for notification on
userspace execution resumption */
char need_resched;
unsigned char delayed_trace; /* single step a syscall */
unsigned char syscall_trace; /* count of syscall interceptors */
unsigned char memdie; /* task was selected to be killed */
unsigned char pad[2];
};
struct thread_struct {
unsigned long ksp; /* kernel stack pointer */
unsigned long usp; /* user stack pointer */
@@ -79,7 +68,6 @@ struct thread_struct {
unsigned long fp[8*3];
unsigned long fpcntl[3]; /* fp control regs */
unsigned char fpstate[FPSTATESIZE]; /* floating point state */
struct task_work work;
struct thread_info info;
};

81
include/asm-m68k/thread_info.h
View File

@@ -6,12 +6,11 @@
struct thread_info {
struct task_struct *task; /* main task structure */
unsigned long flags;
struct exec_domain *exec_domain; /* execution domain */
int preempt_count; /* 0 => preemptable, <0 => BUG */
__u32 cpu; /* should always be 0 on m68k */
struct restart_block restart_block;
__u8 supervisor_stack[0];
};
#define PREEMPT_ACTIVE 0x4000000
@@ -49,76 +48,14 @@ struct thread_info {
#define end_of_stack(p) ((unsigned long *)(p)->thread_info + 1)
#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
#define TIF_DELAYED_TRACE 1 /* single step a syscall */
#define TIF_NOTIFY_RESUME 2 /* resumption notification requested */
#define TIF_SIGPENDING 3 /* signal pending */
#define TIF_NEED_RESCHED 4 /* rescheduling necessary */
#define TIF_MEMDIE 5
extern int thread_flag_fixme(void);
/*
* flag set/clear/test wrappers
* - pass TIF_xxxx constants to these functions
/* entry.S relies on these definitions!
* bits 0-7 are tested at every exception exit
* bits 8-15 are also tested at syscall exit
*/
#define __set_tsk_thread_flag(tsk, flag, val) ({ \
switch (flag) { \
case TIF_SIGPENDING: \
tsk->thread.work.sigpending = val; \
break; \
case TIF_NEED_RESCHED: \
tsk->thread.work.need_resched = val; \
break; \
case TIF_SYSCALL_TRACE: \
tsk->thread.work.syscall_trace = val; \
break; \
case TIF_MEMDIE: \
tsk->thread.work.memdie = val; \
break; \
default: \
thread_flag_fixme(); \
} \
})
#define __get_tsk_thread_flag(tsk, flag) ({ \
int ___res; \
switch (flag) { \
case TIF_SIGPENDING: \
___res = tsk->thread.work.sigpending; \
break; \
case TIF_NEED_RESCHED: \
___res = tsk->thread.work.need_resched; \
break; \
case TIF_SYSCALL_TRACE: \
___res = tsk->thread.work.syscall_trace;\
break; \
case TIF_MEMDIE: \
___res = tsk->thread.work.memdie;\
break; \
default: \
___res = thread_flag_fixme(); \
} \
___res; \
})
#define __get_set_tsk_thread_flag(tsk, flag, val) ({ \
int __res = __get_tsk_thread_flag(tsk, flag); \
__set_tsk_thread_flag(tsk, flag, val); \
__res; \
})
#define set_tsk_thread_flag(tsk, flag) __set_tsk_thread_flag(tsk, flag, ~0)
#define clear_tsk_thread_flag(tsk, flag) __set_tsk_thread_flag(tsk, flag, 0)
#define test_and_set_tsk_thread_flag(tsk, flag) __get_set_tsk_thread_flag(tsk, flag, ~0)
#define test_tsk_thread_flag(tsk, flag) __get_tsk_thread_flag(tsk, flag)
#define set_thread_flag(flag) set_tsk_thread_flag(current, flag)
#define clear_thread_flag(flag) clear_tsk_thread_flag(current, flag)
#define test_thread_flag(flag) test_tsk_thread_flag(current, flag)
#define set_need_resched() set_thread_flag(TIF_NEED_RESCHED)
#define clear_need_resched() clear_thread_flag(TIF_NEED_RESCHED)
#define TIF_SIGPENDING 6 /* signal pending */
#define TIF_NEED_RESCHED 7 /* rescheduling necessary */
#define TIF_DELAYED_TRACE 14 /* single step a syscall */
#define TIF_SYSCALL_TRACE 15 /* syscall trace active */
#define TIF_MEMDIE 16
#endif /* _ASM_M68K_THREAD_INFO_H */