[PATCH] uml: skas0-hold-own-ldt fixups for x86-64

In a recent fixup i386 code was copied raw to x86_64 subarch to make it
compile again.

Here there are some little fixups and resyncs needed for it (mainly for
cleanliness sake) - I did an audit and found the rest of the code to be safe.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 6 insertions, 2 deletions

diff --git a/include/asm-um/ldt-x86_64.h b/include/asm-um/ldt-x86_64.h
index 57159f12dde2..96b35aada79a 100644
--- a/include/asm-um/ldt-x86_64.h
+++ b/include/asm-um/ldt-x86_64.h
@@ -39,11 +39,13 @@ typedef struct uml_ldt {
 } uml_ldt_t;
 
 /*
- * macros stolen from include/asm-i386/desc.h
+ * macros stolen from include/asm-x86_64/desc.h
  */
 #define LDT_entry_a(info) \
         ((((info)->base_addr & 0x0000ffff) << 16) | ((info)->limit & 0x0ffff))
 
+/* Don't allow setting of the lm bit. It is useless anyways because
+ * 64bit system calls require __USER_CS. */
 #define LDT_entry_b(info) \
         (((info)->base_addr & 0xff000000) | \
         (((info)->base_addr & 0x00ff0000) >> 16) | \
@@ -54,6 +56,7 @@ typedef struct uml_ldt {
         ((info)->seg_32bit << 22) | \
         ((info)->limit_in_pages << 23) | \
         ((info)->useable << 20) | \
+        /* ((info)->lm << 21) | */ \
         0x7000)
 
 #define LDT_empty(info) (\
@@ -64,6 +67,7 @@ typedef struct uml_ldt {
         (info)->seg_32bit       == 0    && \
         (info)->limit_in_pages  == 0    && \
         (info)->seg_not_present == 1    && \
-        (info)->useable         == 0    )
+        (info)->useable         == 0    && \
+        (info)->lm              == 0)
 
 #endif