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x86, mm: rename TASK_SIZE64 => TASK_SIZE_MAX 

Impact: cleanup

Rename TASK_SIZE64 to TASK_SIZE_MAX, and provide the
define on 32-bit too. (mapped to TASK_SIZE)

This allows 32-bit code to make use of the (former-) TASK_SIZE64
symbol as well, in a clean way.

Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2009-02-20 23:32:28 +01:00
parent c3731c6866
commit d951734654
4 changed files with 9 additions and 8 deletions
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9
arch/x86/include/asm/processor.h
View File

@ -861,6 +861,7 @@ static inline void spin_lock_prefetch(const void *x)
* User space process size: 3GB (default).
*/
#define TASK_SIZE PAGE_OFFSET
#define TASK_SIZE_MAX TASK_SIZE
#define STACK_TOP TASK_SIZE
#define STACK_TOP_MAX STACK_TOP
@ -920,7 +921,7 @@ extern unsigned long thread_saved_pc(struct task_struct *tsk);
/*
* User space process size. 47bits minus one guard page.
*/
#define TASK_SIZE64 ((1UL << 47) - PAGE_SIZE)
#define TASK_SIZE_MAX ((1UL << 47) - PAGE_SIZE)
/* This decides where the kernel will search for a free chunk of vm
* space during mmap's.
@ -929,12 +930,12 @@ extern unsigned long thread_saved_pc(struct task_struct *tsk);
0xc0000000 : 0xFFFFe000)
#define TASK_SIZE (test_thread_flag(TIF_IA32) ? \
IA32_PAGE_OFFSET : TASK_SIZE64)
IA32_PAGE_OFFSET : TASK_SIZE_MAX)
#define TASK_SIZE_OF(child) ((test_tsk_thread_flag(child, TIF_IA32)) ? \
IA32_PAGE_OFFSET : TASK_SIZE64)
IA32_PAGE_OFFSET : TASK_SIZE_MAX)
#define STACK_TOP TASK_SIZE
#define STACK_TOP_MAX TASK_SIZE64
#define STACK_TOP_MAX TASK_SIZE_MAX
#define INIT_THREAD { \
.sp0 = (unsigned long)&init_stack + sizeof(init_stack) \

2
arch/x86/kernel/ptrace.c
View File

@ -268,7 +268,7 @@ static unsigned long debugreg_addr_limit(struct task_struct *task)
if (test_tsk_thread_flag(task, TIF_IA32))
return IA32_PAGE_OFFSET - 3;
#endif
return TASK_SIZE64 - 7;
return TASK_SIZE_MAX - 7;
}
#endif /* CONFIG_X86_32 */

2
arch/x86/mm/fault.c
View File

@ -963,7 +963,7 @@ static int fault_in_kernel_space(unsigned long address)
#ifdef CONFIG_X86_32
return address >= TASK_SIZE;
#else
return address >= TASK_SIZE64;
return address >= TASK_SIZE_MAX;
#endif
}

4
arch/x86/vdso/vma.c
View File

@ -85,8 +85,8 @@ static unsigned long vdso_addr(unsigned long start, unsigned len)
unsigned long addr, end;
unsigned offset;
end = (start + PMD_SIZE - 1) & PMD_MASK;
if (end >= TASK_SIZE64)
end = TASK_SIZE64;
if (end >= TASK_SIZE_MAX)
end = TASK_SIZE_MAX;
end -= len;
/* This loses some more bits than a modulo, but is cheaper */
offset = get_random_int() & (PTRS_PER_PTE - 1);