linux-kernel - [PATCH] ARM: small correction to early

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Date:   Mon, 26 Jun 2017 17:57:29 -0700
From:   Doug Berger <opendmb@...il.com>
To:     Russell King <linux@...linux.org.uk>
Cc:     Doug Berger <opendmb@...il.com>, Laura Abbott <labbott@...hat.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Nicolas Pitre <nicolas.pitre@...aro.org>,
        Jon Medhurst <tixy@...aro.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Marc Zyngier <marc.zyngier@....com>,
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM PORT),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] ARM: small correction to early_ioremap support

The fixmap pages need to be on the same pmd page for the current
implementation of arm early_fixmap.  A build time bug check is
used to ensure that.  However, the worst case fixmap range is
better represented by __end_of_fixed_addresses than by the value
__end_of_early_ioremap_region.

Fixes: 2937367b8a4b ("ARM: add support for generic early_ioremap/early_memremap")
Signed-off-by: Doug Berger <opendmb@...il.com>
---
 arch/arm/mm/mmu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 31af3cb59a60..74c0ed5c3b08 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -392,7 +392,7 @@ void __init early_fixmap_init(void)
 	 * The early fixmap range spans multiple pmds, for which
 	 * we are not prepared:
 	 */
-	BUILD_BUG_ON((__fix_to_virt(__end_of_early_ioremap_region) >> PMD_SHIFT)
+	BUILD_BUG_ON((__fix_to_virt(__end_of_fixed_addresses) >> PMD_SHIFT)
 		     != FIXADDR_TOP >> PMD_SHIFT);
 
 	pmd = fixmap_pmd(FIXADDR_TOP);
-- 
2.13.0