linux-kernel - [PATCH RFC] ARM: mm: Fix for highmem on machines with more than 14 cores

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Date:	Mon, 24 Mar 2014 22:02:12 +0100
From:	Anders Berg <anders.berg@....com>
To:	Russell King <linux@....linux.org.uk>,
	Nicolas Pitre <nicolas.pitre@...aro.org>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, Anders Berg <anders.berg@....com>,
	Fredrik Markström <fredrik.markstrom@...il.com>
Subject: [PATCH RFC] ARM: mm: Fix for highmem on machines with more than 14 cores

The fixmap area was hard coded to 224 pages which was only enough for 14 CPU:s.
Now the area adapts to the configured number of CPU:s (NR_CPUS). We still have
a hard limit of 30 CPU:s since we only have a single pte-chunk (512 pte:s).

Signed-off-by: Anders Berg <anders.berg@....com>
Signed-off-by: Fredrik Markström <fredrik.markstrom@...il.com>
---
 arch/arm/include/asm/fixmap.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm/include/asm/fixmap.h b/arch/arm/include/asm/fixmap.h
index bbae919..40f1f05 100644
--- a/arch/arm/include/asm/fixmap.h
+++ b/arch/arm/include/asm/fixmap.h
@@ -7,15 +7,15 @@
  * On ARM we already have well known fixed virtual addresses imposed by
  * the architecture such as the vector page which is located at 0xffff0000,
  * therefore a second level page table is already allocated covering
- * 0xfff00000 upwards.
+ * 0xffe00000 upwards.
  *
  * The cache flushing code in proc-xscale.S uses the virtual area between
  * 0xfffe0000 and 0xfffeffff.
  */
 
-#define FIXADDR_START		0xfff00000UL
+#define FIXADDR_SIZE		((KM_TYPE_NR * NR_CPUS) << PAGE_SHIFT)
 #define FIXADDR_TOP		0xfffe0000UL
-#define FIXADDR_SIZE		(FIXADDR_TOP - FIXADDR_START)
+#define FIXADDR_START		(FIXADDR_TOP - FIXADDR_SIZE)
 
 #define FIX_KMAP_BEGIN		0
 #define FIX_KMAP_END		(FIXADDR_SIZE >> PAGE_SHIFT)
-- 
1.8.3.2

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