mips: replace arch specific way to determine 32bit task with generic version

Mips uses TASK_IS_32BIT_ADDR to determine if a task is 32bit, but this
define is mips specific and other arches do not have it: instead, use
!IS_ENABLED(CONFIG_64BIT) || is_compat_task() condition.

Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Alexandre Ghiti <[e-mail]>
Acked-by: Paul Burton <[e-mail]>
Reviewed-by: Kees Cook <[e-mail]>
Reviewed-by: Luis Chamberlain <[e-mail]>
Cc: Albert Ou <[e-mail]>
Cc: Alexander Viro <[e-mail]>
Cc: Catalin Marinas <[e-mail]>
Cc: Christoph Hellwig <[e-mail]>
Cc: Christoph Hellwig <[e-mail]>
Cc: James Hogan <[e-mail]>
Cc: Palmer Dabbelt <[e-mail]>
Cc: Ralf Baechle <[e-mail]>
Cc: Russell King <[e-mail]>
Cc: Will Deacon <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/mips/mm/mmap.c

···
 #include <linux/sched/signal.h>
 #include <linux/sched/mm.h>
 #include <linux/sizes.h>
+#include <linux/compat.h>
 
 unsigned long shm_align_mask = PAGE_SIZE - 1;	/* Sane caches */
 EXPORT_SYMBOL(shm_align_mask);
···
 
 	rnd = rnd << PAGE_SHIFT;
 	/* 32MB for 32bit, 1GB for 64bit */
-	if (TASK_IS_32BIT_ADDR)
+	if (!IS_ENABLED(CONFIG_64BIT) || is_compat_task())
 		rnd = rnd & (SZ_32M - 1);
 	else
 		rnd = rnd & (SZ_1G - 1);