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x86: Factor out TIF_IA32 from 32-bit address space

Selaa lähdekoodia 
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
This commit is contained in:
H. Peter Anvin
2012-02-06 13:03:09 -08:00
vanhempi cf420048b3
commit 6bd330083e
6 muutettua tiedostoa jossa 13 lisäystä ja 9 poistoa
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2
arch/x86/kernel/process_64.c
Näytä tiedosto

@@ -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. */

6
arch/x86/kernel/sys_x86_64.c
Näytä tiedosto

@@ -98,7 +98,7 @@ out:
static void find_start_end(unsigned long flags, unsigned long *begin,
unsigned long *end)
{
if (!test_thread_flag(TIF_IA32) && (flags & MAP_32BIT)) {
if (!test_thread_flag(TIF_ADDR32) && (flags & MAP_32BIT)) {
unsigned long new_begin;
/* This is usually used needed to map code in small
model, so it needs to be in the first 31bit. Limit
@@ -144,7 +144,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
(!vma || addr + len <= vma->vm_start))
return addr;
}
if (((flags & MAP_32BIT) || test_thread_flag(TIF_IA32))
if (((flags & MAP_32BIT) || test_thread_flag(TIF_ADDR32))
&& len <= mm->cached_hole_size) {
mm->cached_hole_size = 0;
mm->free_area_cache = begin;
@@ -205,7 +205,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
return addr;
/* for MAP_32BIT mappings we force the legact mmap base */
if (!test_thread_flag(TIF_IA32) && (flags & MAP_32BIT))
if (!test_thread_flag(TIF_ADDR32) && (flags & MAP_32BIT))
goto bottomup;
/* requesting a specific address */