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| author | Brian Gerst <brgerst@gmail.com> | 2009-12-09 18:34:41 +0100 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2009-12-11 00:55:30 +0100 |
| commit | fa4b8f84383ae197e643a46c36bf58ab8dffc95c (patch) | |
| tree | f114c29d8ca381f20c0c8d0ba854f3c16bb8b834 /arch/x86/kernel/process_64.c | |
| parent | x86, 64-bit: Move kernel_thread to C (diff) | |
| download | linux-fa4b8f84383ae197e643a46c36bf58ab8dffc95c.tar.xz linux-fa4b8f84383ae197e643a46c36bf58ab8dffc95c.zip | |
x86, 64-bit: Use user_mode() to determine new stack pointer in copy_thread()
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>
Diffstat (limited to 'arch/x86/kernel/process_64.c')
| -rw-r--r-- | arch/x86/kernel/process_64.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index 92484c2130c6..00ac66fa5c6b 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -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, ®s, 0, NULL, NULL); + return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, ®s, 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; |