arm64: fix add kasan bug

In general, each process have 16kb stack space to use, but stack need
extra space to store red_zone when kasan enable.  the patch fix above
question.

Signed-off-by: zhong jiang <[email protected]>
Cc: Andrey Ryabinin <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Xishi Qiu <[email protected]>
Cc: Wang Long <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: xiongzhongjiang

arch/arm64/include/asm/thread_info.h

@@ -23,13 +23,24 @@
 
 #include <linux/compiler.h>
 
+#ifdef CONFIG_KASAN
+#define KASAN_STACK_ORDER 1
+#else
+#define KASAN_STACK_ORDER 0
+#endif
+
 #ifdef CONFIG_ARM64_4K_PAGES
-#define THREAD_SIZE_ORDER	2
+#define THREAD_SIZE_ORDER	(2 + KASAN_STACK_ORDER)
 #elif defined(CONFIG_ARM64_16K_PAGES)
-#define THREAD_SIZE_ORDER	0
+#define THREAD_SIZE_ORDER	(0 + KASAN_STACK_ORDER)
 #endif
 
+#ifdef CONFIG_KASAN
+#define THREAD_SIZE		32768
+#else
 #define THREAD_SIZE		16384
+#endif
+
 #define THREAD_START_SP		(THREAD_SIZE - 16)
 
 #ifndef __ASSEMBLY__