From ac060e0fc9cbe4bae1099e2919dcf287514751fd Mon Sep 17 00:00:00 2001
From: Mark Rutland <mark.rutland@arm.com>
Date: Fri, 14 Jul 2017 16:39:21 +0100
Subject: [PATCH 29/51] arm64: clean up THREAD_* definitions

Git-commit: dbc9344a68e506f19f80a9affc8fe7023a9cdc4c
Patch-mainline: v4.14-rc1
References: bsc#1068032

Currently we define THREAD_SIZE and THREAD_SIZE_ORDER separately, with
the latter dependent on particular CONFIG_ARM64_*K_PAGES definitions.
This is somewhat opaque, and will get in the way of future modifications
to THREAD_SIZE.

This patch cleans this up, defining both in terms of a common
THREAD_SHIFT, and using PAGE_SHIFT to calculate THREAD_SIZE_ORDER,
rather than using a number of definitions dependent on config symbols.
Subsequent patches will make use of this to alter the stack size used in
some configurations.

At the same time, these are moved into <asm/memory.h>, which will avoid
circular include issues in subsequent patches. To ensure that existing
code isn't adversely affected, <asm/thread_info.h> is updated to
transitively include these definitions.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Tested-by: Laura Abbott <labbott@redhat.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: James Morse <james.morse@arm.com>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
 arch/arm64/include/asm/memory.h      | 8 ++++++++
 arch/arm64/include/asm/thread_info.h | 9 +--------
 2 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index 77d55dcfb86c..8ab4774e2616 100644
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -102,6 +102,14 @@
 #define KASAN_SHADOW_SIZE	(0)
 #endif
 
+#define THREAD_SHIFT		14
+
+#if THREAD_SHIFT >= PAGE_SHIFT
+#define THREAD_SIZE_ORDER	(THREAD_SHIFT - PAGE_SHIFT)
+#endif
+
+#define THREAD_SIZE		(UL(1) << THREAD_SHIFT)
+
 /*
  * Memory types available.
  */
diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h
index b29ab0e12e60..aa04b733b349 100644
--- a/arch/arm64/include/asm/thread_info.h
+++ b/arch/arm64/include/asm/thread_info.h
@@ -23,18 +23,11 @@
 
 #include <linux/compiler.h>
 
-#ifdef CONFIG_ARM64_4K_PAGES
-#define THREAD_SIZE_ORDER	2
-#elif defined(CONFIG_ARM64_16K_PAGES)
-#define THREAD_SIZE_ORDER	0
-#endif
-
-#define THREAD_SIZE		16384
-
 #ifndef __ASSEMBLY__
 
 struct task_struct;
 
+#include <asm/memory.h>
 #include <asm/stack_pointer.h>
 #include <asm/types.h>
 
-- 
2.11.0