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authorAl Viro <viro@zeniv.linux.org.uk>2012-10-11 05:35:42 +0400
committerAl Viro <viro@zeniv.linux.org.uk>2012-10-12 21:35:22 +0400
commit22e2430d60dbdfcdd732a086e9ef2dbd74c266d1 (patch)
tree687067fcaf2761015639178033ee16c8511703b8 /arch/um
parenta74fb73c12398b250fdc5e333a11e15a9e3a84fc (diff)
downloadlinux-22e2430d60dbdfcdd732a086e9ef2dbd74c266d1.tar.xz
x86, um: convert to saner kernel_execve() semantics
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/um')
-rw-r--r--arch/um/include/asm/processor-generic.h2
-rw-r--r--arch/um/include/shared/os.h1
-rw-r--r--arch/um/kernel/exec.c5
-rw-r--r--arch/um/kernel/process.c10
-rw-r--r--arch/um/os-Linux/process.c13
5 files changed, 3 insertions, 28 deletions
diff --git a/arch/um/include/asm/processor-generic.h b/arch/um/include/asm/processor-generic.h
index 5d9ab0c4f488..62435a00e70e 100644
--- a/arch/um/include/asm/processor-generic.h
+++ b/arch/um/include/asm/processor-generic.h
@@ -26,7 +26,6 @@ struct thread_struct {
jmp_buf *fault_catcher;
struct task_struct *prev_sched;
unsigned long temp_stack;
- jmp_buf *exec_buf;
struct arch_thread arch;
jmp_buf switch_buf;
int mm_count;
@@ -54,7 +53,6 @@ struct thread_struct {
.fault_addr = NULL, \
.prev_sched = NULL, \
.temp_stack = 0, \
- .exec_buf = NULL, \
.arch = INIT_ARCH_THREAD, \
.request = { 0 } \
}
diff --git a/arch/um/include/shared/os.h b/arch/um/include/shared/os.h
index 89b686c1a3ea..25dbd372d322 100644
--- a/arch/um/include/shared/os.h
+++ b/arch/um/include/shared/os.h
@@ -191,7 +191,6 @@ extern int os_getpid(void);
extern int os_getpgrp(void);
extern void init_new_thread_signals(void);
-extern int run_kernel_thread(int (*fn)(void *), void *arg, jmp_buf **jmp_ptr);
extern int os_map_memory(void *virt, int fd, unsigned long long off,
unsigned long len, int r, int w, int x);
diff --git a/arch/um/kernel/exec.c b/arch/um/kernel/exec.c
index e427301f55d6..565ca396d83e 100644
--- a/arch/um/kernel/exec.c
+++ b/arch/um/kernel/exec.c
@@ -47,8 +47,3 @@ void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp)
#endif
}
EXPORT_SYMBOL(start_thread);
-
-void __noreturn ret_from_kernel_execve(struct pt_regs *unused)
-{
- UML_LONGJMP(current->thread.exec_buf, 1);
-}
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index a1b50add48a2..94b0d8b9810b 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -135,14 +135,10 @@ void new_thread_handler(void)
arg = current->thread.request.u.thread.arg;
/*
- * The return value is 1 if the kernel thread execs a process,
- * 0 if it just exits
+ * callback returns only if the kernel thread execs a process
*/
- n = run_kernel_thread(fn, arg, &current->thread.exec_buf);
- if (n == 1)
- userspace(&current->thread.regs.regs);
- else
- do_exit(0);
+ n = fn(arg);
+ userspace(&current->thread.regs.regs);
}
/* Called magically, see new_thread_handler above */
diff --git a/arch/um/os-Linux/process.c b/arch/um/os-Linux/process.c
index 307f173e7f82..a04ec167a9c3 100644
--- a/arch/um/os-Linux/process.c
+++ b/arch/um/os-Linux/process.c
@@ -244,16 +244,3 @@ void init_new_thread_signals(void)
signal(SIGWINCH, SIG_IGN);
signal(SIGTERM, SIG_DFL);
}
-
-int run_kernel_thread(int (*fn)(void *), void *arg, jmp_buf **jmp_ptr)
-{
- jmp_buf buf;
- int n;
-
- *jmp_ptr = &buf;
- n = UML_SETJMP(&buf);
- if (n != 0)
- return n;
- (*fn)(arg);
- return 0;
-}