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x86, 64-bit: Use user_mode() to determine new stack pointer in copy_thread()

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Use user_mode() instead of a magic value for sp to determine when returning
to kernel mode.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
LKML-Reference: <1260380084-3707-3-git-send-email-brgerst@gmail.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Brian Gerst 2009-12-09 12:34:41 -05:00 committed by H. Peter Anvin
parent 3bd95dfb18
commit fa4b8f8438
1 changed files with 4 additions and 3 deletions
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7
arch/x86/kernel/process_64.c
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@ -254,7 +254,7 @@ int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
regs.flags = X86_EFLAGS_IF;
/* Ok, create the new process.. */
return do_fork(flags | CLONE_VM | CLONE_UNTRACED, ~0UL, &regs, 0, NULL, NULL);
return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0, NULL, NULL);
}
EXPORT_SYMBOL(kernel_thread);
@ -312,8 +312,9 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
*childregs = *regs;
childregs->ax = 0;
childregs->sp = sp;
if (sp == ~0UL)
if (user_mode(regs))
childregs->sp = sp;
else
childregs->sp = (unsigned long)childregs;
p->thread.sp = (unsigned long) childregs;