aboutsummaryrefslogtreecommitdiff
path: root/arch/arm/kernel
diff options
context:
space:
mode:
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/arm/kernel
parent8418263e3547ed3816475e4c55a77004f0426ee6 (diff)
parent5522be6a4624a5f505555569e4d9cee946630686 (diff)
downloadlinux-linaro-stable-4e21fc138bfd7fe625ff5dc81541399aaf9d429b.tar.gz
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/arm/kernel')
-rw-r--r--arch/arm/kernel/entry-common.S29
-rw-r--r--arch/arm/kernel/process.c5
2 files changed, 6 insertions, 28 deletions
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index e340fa1db203..417bac1846bd 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -86,35 +86,14 @@ ENDPROC(ret_to_user)
*/
ENTRY(ret_from_fork)
bl schedule_tail
+ cmp r5, #0
+ movne r0, r4
+ movne lr, pc
+ movne pc, r5
get_thread_info tsk
- mov why, #1
b ret_slow_syscall
ENDPROC(ret_from_fork)
-ENTRY(ret_from_kernel_thread)
- UNWIND(.fnstart)
- UNWIND(.cantunwind)
- bl schedule_tail
- mov r0, r4
- adr lr, BSYM(1f) @ kernel threads should not exit
- mov pc, r5
-1: bl do_exit
- nop
- UNWIND(.fnend)
-ENDPROC(ret_from_kernel_thread)
-
-/*
- * turn a kernel thread into userland process
- * use: ret_from_kernel_execve(struct pt_regs *normal)
- */
-ENTRY(ret_from_kernel_execve)
- mov why, #0 @ not a syscall
- str why, [r0, #S_R0] @ ... and we want 0 in ->ARM_r0 as well
- get_thread_info tsk @ thread structure
- mov sp, r0 @ stack pointer just under pt_regs
- b ret_slow_syscall
-ENDPROC(ret_from_kernel_execve)
-
.equ NR_syscalls,0
#define CALL(x) .equ NR_syscalls,NR_syscalls+1
#include "calls.S"
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index f98c17ff1957..90084a6de35a 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -373,7 +373,6 @@ void release_thread(struct task_struct *dead_task)
}
asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
-asmlinkage void ret_from_kernel_thread(void) __asm__("ret_from_kernel_thread");
int
copy_thread(unsigned long clone_flags, unsigned long stack_start,
@@ -388,13 +387,13 @@ copy_thread(unsigned long clone_flags, unsigned long stack_start,
*childregs = *regs;
childregs->ARM_r0 = 0;
childregs->ARM_sp = stack_start;
- thread->cpu_context.pc = (unsigned long)ret_from_fork;
} else {
+ memset(childregs, 0, sizeof(struct pt_regs));
thread->cpu_context.r4 = stk_sz;
thread->cpu_context.r5 = stack_start;
- thread->cpu_context.pc = (unsigned long)ret_from_kernel_thread;
childregs->ARM_cpsr = SVC_MODE;
}
+ thread->cpu_context.pc = (unsigned long)ret_from_fork;
thread->cpu_context.sp = (unsigned long)childregs;
clear_ptrace_hw_breakpoint(p);