From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Rabin Vincent <rabin@rab.in>
Cc: "Aguirre Rodriguez, Sergio Alberto" <saaguirre@ti.com>,
"Syed Mohammed, Khasim" <khasim@ti.com>,
"linux-arm-kernel@lists.arm.linux.org.uk"
<linux-arm-kernel@lists.arm.linux.org.uk>,
"linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>
Subject: Re: Exception while handling MEM Hole on OMAP3 / ARM Cortex A8
Message-ID: <20090907142210.GB23361@n2100.arm.linux.org.uk>
List-ID: <linux-omap.vger.kernel.org>
X-Mailing-List: linux-omap@vger.kernel.org
On Tue, Aug 18, 2009 at 08:31:49AM +0530, Rabin Vincent wrote:
> Here's a fixed version:
And here's my revised version with these fixes in. I changed the
while loop to a do..while loop instead (since we will always have
at least one memory bank, it's pointless doing that test for the
first iteration.)
Acks and tested-bys would be useful please.
diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
index 376be1a..cefedf0 100644
--- a/arch/arm/include/asm/memory.h
+++ b/arch/arm/include/asm/memory.h
@@ -218,7 +218,6 @@ static inline __deprecated void *bus_to_virt(unsigned long x)
*
* page_to_pfn(page) convert a struct page * to a PFN number
* pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
- * pfn_valid(pfn) indicates whether a PFN number is valid
*
* virt_to_page(k) convert a _valid_ virtual address to struct page *
* virt_addr_valid(k) indicates whether a virtual address is valid
@@ -227,10 +226,6 @@ static inline __deprecated void *bus_to_virt(unsigned long x)
#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
-#ifndef CONFIG_SPARSEMEM
-#define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
-#endif
-
#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
#define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
@@ -247,18 +242,6 @@ static inline __deprecated void *bus_to_virt(unsigned long x)
#define arch_pfn_to_nid(pfn) PFN_TO_NID(pfn)
#define arch_local_page_offset(pfn, nid) LOCAL_MAP_NR((pfn) << PAGE_SHIFT)
-#define pfn_valid(pfn) \
- ({ \
- unsigned int nid = PFN_TO_NID(pfn); \
- int valid = nid < MAX_NUMNODES; \
- if (valid) { \
- pg_data_t *node = NODE_DATA(nid); \
- valid = (pfn - node->node_start_pfn) < \
- node->node_spanned_pages; \
- } \
- valid; \
- })
-
#define virt_to_page(kaddr) \
(ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
diff --git a/arch/arm/include/asm/page.h b/arch/arm/include/asm/page.h
index 9c746af..3a32af4 100644
--- a/arch/arm/include/asm/page.h
+++ b/arch/arm/include/asm/page.h
@@ -194,6 +194,10 @@ typedef unsigned long pgprot_t;
typedef struct page *pgtable_t;
+#ifndef CONFIG_SPARSEMEM
+extern int pfn_valid(unsigned long);
+#endif
+
#include <asm/memory.h>
#endif /* !__ASSEMBLY__ */
--- /tmp/init.c 2009-09-15 10:17:10.000000000 +0200
+++ git/arch/arm/mm/init.c 2009-09-15 10:17:01.000000000 +0200
@@ -15,6 +15,7 @@
#include <linux/mman.h>
#include <linux/nodemask.h>
#include <linux/initrd.h>
+#include <linux/sort.h>
#include <linux/highmem.h>
#include <asm/mach-types.h>
@@ -349,12 +350,43 @@
free_area_init_node(node, zone_size, min, zhole_size);
}
+#ifndef CONFIG_SPARSEMEM
+int pfn_valid(unsigned long pfn)
+{
+ struct meminfo *mi = &meminfo;
+ unsigned int left = 0, right = mi->nr_banks;
+
+ do {
+ unsigned int mid = (right + left) / 2;
+ struct membank *bank = &mi->bank[mid];
+
+ if (pfn < bank_pfn_start(bank))
+ right = mid;
+ else if (pfn >= bank_pfn_end(bank))
+ left = mid + 1;
+ else
+ return 1;
+ } while (left < right);
+ return 0;
+}
+EXPORT_SYMBOL(pfn_valid);
+#endif
+
+static int __init meminfo_cmp(const void *_a, const void *_b)
+{
+ const struct membank *a = _a, *b = _b;
+ long cmp = bank_pfn_start(a) - bank_pfn_start(b);
+ return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
+}
+
void __init bootmem_init(void)
{
struct meminfo *mi = &meminfo;
unsigned long min, max_low, max_high;
int node, initrd_node;
+ sort(&mi->bank, mi->nr_banks, sizeof(mi->bank[0]), meminfo_cmp, NULL);
+
/*
* Locate which node contains the ramdisk image, if any.
*/
diff -purN git2/arch/arm/Kconfig git/arch/arm/Kconfig
--- git2/arch/arm/Kconfig 2009-07-20 05:07:12.000000000 +0530
+++ git/arch/arm/Kconfig 2009-08-17 12:08:37.000000000 +0530
@@ -569,6 +570,7 @@ config ARCH_OMAP
select ARCH_REQUIRE_GPIOLIB
select GENERIC_TIME
select GENERIC_CLOCKEVENTS
+ select ARCH_HAS_HOLES_MEMORYMODEL
help
Support for TI's OMAP platform (OMAP1 and OMAP2).