linux-kernel - [PATCH v1 10/13] powerpc/kconfig: define PAGE

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Message-Id: <2d30492ee923bd1e8513d374e13c58ad72f481d2.1543517818.git.christophe.leroy@c-s.fr>
Date:   Thu, 29 Nov 2018 19:00:30 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, j.neuschaefer@....net
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v1 10/13] powerpc/kconfig: define PAGE_SHIFT inside Kconfig

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 arch/powerpc/Kconfig            |  7 +++++++
 arch/powerpc/include/asm/page.h | 13 ++-----------
 2 files changed, 9 insertions(+), 11 deletions(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 8be31261aec8..4a81a80d0635 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -711,6 +711,13 @@ config PPC_256K_PAGES
 
 endchoice
 
+config PPC_PAGE_SHIFT
+	int
+	default 18 if PPC_256K_PAGES
+	default 16 if PPC_64K_PAGES
+	default 14 if PPC_16K_PAGES
+	default 12
+
 config THREAD_SHIFT
 	int "Thread shift" if EXPERT
 	range 13 15
diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h
index 9ea903221a9f..d12a55441629 100644
--- a/arch/powerpc/include/asm/page.h
+++ b/arch/powerpc/include/asm/page.h
@@ -20,20 +20,11 @@
 
 /*
  * On regular PPC32 page size is 4K (but we support 4K/16K/64K/256K pages
- * on PPC44x). For PPC64 we support either 4K or 64K software
+ * on PPC44x and 4K/16K on 8xx). For PPC64 we support either 4K or 64K software
  * page size. When using 64K pages however, whether we are really supporting
  * 64K pages in HW or not is irrelevant to those definitions.
  */
-#if defined(CONFIG_PPC_256K_PAGES)
-#define PAGE_SHIFT		18
-#elif defined(CONFIG_PPC_64K_PAGES)
-#define PAGE_SHIFT		16
-#elif defined(CONFIG_PPC_16K_PAGES)
-#define PAGE_SHIFT		14
-#else
-#define PAGE_SHIFT		12
-#endif
-
+#define PAGE_SHIFT		CONFIG_PPC_PAGE_SHIFT
 #define PAGE_SIZE		(ASM_CONST(1) << PAGE_SHIFT)
 
 #ifndef __ASSEMBLY__
-- 
2.13.3