[PATCH] i386: espfix cleanup

Clean up the espfix code:

- Introduced PER_CPU() macro to be used from asm
- Introduced GET_DESC_BASE() macro to be used from asm
- Rewrote the fixup code in asm, as calling a C code with the altered %ss
  appeared to be unsafe
- No longer altering the stack from a .fixup section
- 16bit per-cpu stack is no longer used, instead the stack segment base
  is patched the way so that the high word of the kernel and user %esp
  are the same.
- Added the limit-patching for the espfix segment. (Chuck Ebbert)

[jeremy@goop.org: use the x86 scaling addressing mode rather than shifting]
Signed-off-by: Stas Sergeev <stsp@aknet.ru>
Signed-off-by: Andi Kleen <ak@suse.de>
Acked-by: Zachary Amsden <zach@vmware.com>
Acked-by: Chuck Ebbert <76306.1226@compuserve.com>
Acked-by: Jan Beulich <jbeulich@novell.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/i386/kernel/head.S b/arch/i386/kernel/head.S
index ca31f18d277c..b1f1df11fcc6 100644
--- a/arch/i386/kernel/head.S
+++ b/arch/i386/kernel/head.S
@@ -584,7 +584,7 @@ ENTRY(cpu_gdt_table)
         .quad 0x00009a000000ffff        /* 0xc0 APM CS 16 code (16 bit) */
         .quad 0x004092000000ffff        /* 0xc8 APM DS    data */
 
-        .quad 0x0000920000000000        /* 0xd0 - ESPFIX 16-bit SS */
+        .quad 0x00c0920000000000        /* 0xd0 - ESPFIX SS */
         .quad 0x0000000000000000        /* 0xd8 - unused */
         .quad 0x0000000000000000        /* 0xe0 - unused */
         .quad 0x0000000000000000        /* 0xe8 - unused */