x86: use kernel_stack_pointer() in process_32.c
commitdef3c5d0a34e4b09b3cea4435c17209ad347104d
authorH. Peter Anvin <hpa@zytor.com>
Mon, 12 Oct 2009 21:09:07 +0000 (12 14:09 -0700)
committerH. Peter Anvin <hpa@zytor.com>
Mon, 12 Oct 2009 21:19:34 +0000 (12 14:19 -0700)
treef9a38b4908dc05a1a5c33a351cd821c0c49adad3
parentd93a8f829fe1d2f3002f2c6ddb553d12db420412
x86: use kernel_stack_pointer() in process_32.c

The way to obtain a kernel-mode stack pointer from a struct pt_regs in
32-bit mode is "subtle": the stack doesn't actually contain the stack
pointer, but rather the location where it would have been marks the
actual previous stack frame.  For clarity, use kernel_stack_pointer()
instead of coding this weirdness explicitly.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
arch/x86/kernel/process_32.c