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25906730
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体验新版 GitCode,发现更多精彩内容 >>
提交
25906730
编写于
10月 21, 2012
作者:
A
Al Viro
浏览文件
操作
浏览文件
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电子邮件补丁
差异文件
alpha: reorganize copy_process(), prepare to saner fork_idle()
Signed-off-by:
N
Al Viro
<
viro@zeniv.linux.org.uk
>
上级
b960f303
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
14 addition
and
21 deletion
+14
-21
arch/alpha/kernel/process.c
arch/alpha/kernel/process.c
+14
-21
未找到文件。
arch/alpha/kernel/process.c
浏览文件 @
25906730
...
...
@@ -266,18 +266,22 @@ alpha_vfork(void)
int
copy_thread
(
unsigned
long
clone_flags
,
unsigned
long
usp
,
unsigned
long
arg
,
struct
task_struct
*
p
,
struct
pt_regs
*
regs
)
struct
task_struct
*
p
,
struct
pt_regs
*
wontuse
)
{
extern
void
ret_from_fork
(
void
);
extern
void
ret_from_kernel_thread
(
void
);
struct
thread_info
*
childti
=
task_thread_info
(
p
);
struct
pt_regs
*
childregs
=
task_pt_regs
(
p
);
struct
pt_regs
*
regs
=
current_pt_regs
();
struct
switch_stack
*
childstack
,
*
stack
;
unsigned
long
settls
;
childstack
=
((
struct
switch_stack
*
)
childregs
)
-
1
;
if
(
unlikely
(
!
regs
))
{
childti
->
pcb
.
ksp
=
(
unsigned
long
)
childstack
;
childti
->
pcb
.
flags
=
1
;
/* set FEN, clear everything else */
if
(
unlikely
(
p
->
flags
&
PF_KTHREAD
))
{
/* kernel thread */
memset
(
childstack
,
0
,
sizeof
(
struct
switch_stack
)
+
sizeof
(
struct
pt_regs
));
...
...
@@ -286,12 +290,17 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
childstack
->
r10
=
arg
;
childregs
->
hae
=
alpha_mv
.
hae_cache
,
childti
->
pcb
.
usp
=
0
;
childti
->
pcb
.
ksp
=
(
unsigned
long
)
childstack
;
childti
->
pcb
.
flags
=
1
;
/* set FEN, clear everything else */
return
0
;
}
/* Note: if CLONE_SETTLS is not set, then we must inherit the
value from the parent, which will have been set by the block
copy in dup_task_struct. This is non-intuitive, but is
required for proper operation in the case of a threaded
application calling fork. */
if
(
clone_flags
&
CLONE_SETTLS
)
childti
->
pcb
.
unique
=
regs
->
r20
;
childti
->
pcb
.
usp
=
usp
?:
rdusp
();
*
childregs
=
*
regs
;
settls
=
regs
->
r20
;
childregs
->
r0
=
0
;
childregs
->
r19
=
0
;
childregs
->
r20
=
1
;
/* OSF/1 has some strange fork() semantics. */
...
...
@@ -299,22 +308,6 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
stack
=
((
struct
switch_stack
*
)
regs
)
-
1
;
*
childstack
=
*
stack
;
childstack
->
r26
=
(
unsigned
long
)
ret_from_fork
;
childti
->
pcb
.
usp
=
usp
?:
rdusp
();
childti
->
pcb
.
ksp
=
(
unsigned
long
)
childstack
;
childti
->
pcb
.
flags
=
1
;
/* set FEN, clear everything else */
/* Set a new TLS for the child thread? Peek back into the
syscall arguments that we saved on syscall entry. Oops,
except we'd have clobbered it with the parent/child set
of r20. Read the saved copy. */
/* Note: if CLONE_SETTLS is not set, then we must inherit the
value from the parent, which will have been set by the block
copy in dup_task_struct. This is non-intuitive, but is
required for proper operation in the case of a threaded
application calling fork. */
if
(
clone_flags
&
CLONE_SETTLS
)
childti
->
pcb
.
unique
=
settls
;
return
0
;
}
...
...
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