linux-kernel - [PATCHv4 07/12] arm64: Simplify NR_FIX

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Message-Id: <1445260779-22242-8-git-send-email-suzuki.poulose@arm.com>
Date:	Mon, 19 Oct 2015 14:19:33 +0100
From:	"Suzuki K. Poulose" <suzuki.poulose@....com>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org, mark.rutland@....com,
	marc.zyngier@....com, will.deacon@....com, catalin.marinas@....com,
	christoffer.dall@...aro.org, steve.capper@...aro.org,
	ard.biesheuvel@...aro.org, jeremy.linton@....com,
	" Suzuki K. Poulose" <suzuki.poulose@....com>
Subject: [PATCHv4 07/12] arm64: Simplify NR_FIX_BTMAPS calculation

From: Mark Rutland <mark.rutland@....com>

We choose NR_FIX_BTMAPS such that each slot (NR_FIX_BTMAPS * PAGE_SIZE)
can address 256K.

Use division to derive NR_FIX_BTMAPS rather than defining it for each
page size.

Signed-off-by:  Mark Rutland <mark.rutland@....com>
Signed-off-by:  Suzuki K. Poulose <suzuki.poulose@....com>
---
 arch/arm64/include/asm/fixmap.h |    7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/include/asm/fixmap.h b/arch/arm64/include/asm/fixmap.h
index 8b9884c..3097045 100644
--- a/arch/arm64/include/asm/fixmap.h
+++ b/arch/arm64/include/asm/fixmap.h
@@ -17,6 +17,7 @@
 
 #ifndef __ASSEMBLY__
 #include <linux/kernel.h>
+#include <linux/sizes.h>
 #include <asm/boot.h>
 #include <asm/page.h>
 
@@ -55,11 +56,7 @@ enum fixed_addresses {
 	 * Temporary boot-time mappings, used by early_ioremap(),
 	 * before ioremap() is functional.
 	 */
-#ifdef CONFIG_ARM64_64K_PAGES
-#define NR_FIX_BTMAPS		4
-#else
-#define NR_FIX_BTMAPS		64
-#endif
+#define NR_FIX_BTMAPS		(SZ_256K / PAGE_SIZE)
 #define FIX_BTMAPS_SLOTS	7
 #define TOTAL_FIX_BTMAPS	(NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
 
-- 
1.7.9.5

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