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authorLinus Torvalds <torvalds@linux-foundation.org>2012-10-13 10:05:52 +0900
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-13 10:05:52 +0900
commit4e21fc138bfd7fe625ff5dc81541399aaf9d429b (patch)
tree43bedf14d2eee7711b8241dcfd6bd7b8737d9bd5 /arch/um
parent8418263e3547ed3816475e4c55a77004f0426ee6 (diff)
parent5522be6a4624a5f505555569e4d9cee946630686 (diff)
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal
Pull third pile of kernel_execve() patches from Al Viro: "The last bits of infrastructure for kernel_thread() et.al., with alpha/arm/x86 use of those. Plus sanitizing the asm glue and do_notify_resume() on alpha, fixing the "disabled irq while running task_work stuff" breakage there. At that point the rest of kernel_thread/kernel_execve/sys_execve work can be done independently for different architectures. The only pending bits that do depend on having all architectures converted are restrictred to fs/* and kernel/* - that'll obviously have to wait for the next cycle. I thought we'd have to wait for all of them done before we start eliminating the longjump-style insanity in kernel_execve(), but it turned out there's a very simple way to do that without flagday-style changes." * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal: alpha: switch to saner kernel_execve() semantics arm: switch to saner kernel_execve() semantics x86, um: convert to saner kernel_execve() semantics infrastructure for saner ret_from_kernel_thread semantics make sure that kernel_thread() callbacks call do_exit() themselves make sure that we always have a return path from kernel_execve() ppc: eeh_event should just use kthread_run() don't bother with kernel_thread/kernel_execve for launching linuxrc alpha: get rid of switch_stack argument of do_work_pending() alpha: don't bother passing switch_stack separately from regs alpha: take SIGPENDING/NOTIFY_RESUME loop into signal.c alpha: simplify TIF_NEED_RESCHED handling
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 1e82e954e978..c03cd5a02364 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 44883049c11d..95feaa47a2fb 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 ab019c7f0b57..3a8ece7d09ca 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 30629783b3e0..b6d699cdd557 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 162bea3d91b2..b8f34c9e53ae 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;
-}