x86: Factor out TIF_IA32 from 32-bit address space

Factor out IA32 (compatibility instruction set) from 32-bit address
space in the thread_info flags; this is a precondition patch for x32
support.

Originally-by: H. J. Lu <hjl.tools@gmail.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Link: http://lkml.kernel.org/n/tip-4pr1xnnksprt7t0h3w5fw4rv@git.kernel.org

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 9b9fe4a85c87..0e900d09e232 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -508,6 +508,7 @@ void set_personality_64bit(void)
 
         /* Make sure to be in 64bit mode */
         clear_thread_flag(TIF_IA32);
+        clear_thread_flag(TIF_ADDR32);
 
         /* Ensure the corresponding mm is not marked. */
         if (current->mm)
@@ -526,6 +527,7 @@ void set_personality_ia32(void)
 
         /* Make sure to be in 32bit mode */
         set_thread_flag(TIF_IA32);
+        set_thread_flag(TIF_ADDR32);
         current->personality |= force_personality32;
 
         /* Mark the associated mm as containing 32-bit tasks. */