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>

arch/x86/include/asm/processor.h

@@ -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) \

arch/x86/kernel/ptrace.c

@@ -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 */

arch/x86/mm/fault.c

@@ -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
 }
 

arch/x86/vdso/vma.c

@@ -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);