John wrote:
Hi Michael,
After I read this link, noticed that you have the following patch, but when I check up the mips-linux, the patch is not there.
I wonder if you could explain to me a little bit?
Thank you!
John
P.S.: I also worked at SciAtl a few years ago in IPTV division.
John,
I *think* I got tentative signoff from Dave and Any below as per the
copied snipits below.
I made the modifications that they suggested. please see the attached
for two patches:
a) the code
b) the sparsemem.txt doc
not sure if the mips powers that be were ok w/ it. pardon my ignorance,
not sure if I am
required to do anymore. There was some comment to try this out w/ the
CONFIG_SPARSEMEM_VMEMMAP
which I believe should "just work", but we've never tried it as of yet,
so by my rule I can't
say it is so.. (has anyone tried that?)
Mike
====================================================
Dave Hansen wrote:
Looks great to me. I can't test it, of course, but I don't see any
problems with it.
Signed-off-by: Dave Hansen <dave@xxxxxxxxxxxxxxxxxx>
-- Dave
Andy Whitcroft wrote:
Otherwise it looks good to me. I see from the rest of the thread that
there is some discussion over the sizes of these, with that sorted.
Acked-by: Andy Whitcroft <apw@xxxxxxxxxxxx>
-apw
adding patch 1 containing code only:
- - - - - Cisco - - - - -
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immediately by return e-mail and delete it from your computer.>From 8fb6db27d0283a50eb1263580bb14fdf9601b975 Mon Sep 17 00:00:00 2001
From: Sundis <sundism@xxxxxxxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 6 Oct 2008 10:30:12 -0700
Subject: [PATCH] mips sparsemem support
---
arch/mips/kernel/setup.c | 18 +++++++++++++++++-
arch/mips/mm/init.c | 3 +++
include/asm-mips/sparsemem.h | 2 +-
3 files changed, 21 insertions(+), 2 deletions(-)
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index f8a535a..6ff0f72 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -405,7 +405,6 @@ static void __init bootmem_init(void)
/* Register lowmem ranges */
free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
- memory_present(0, start, end);
}
/*
@@ -417,6 +416,23 @@ static void __init bootmem_init(void)
* Reserve initrd memory if needed.
*/
finalize_initrd();
+
+ /* call memory present for all the ram */
+ for (i = 0; i < boot_mem_map.nr_map; i++) {
+ unsigned long start, end;
+
+ /*
+ * * memory present only usable memory.
+ * */
+ if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
+ continue;
+
+ start = PFN_UP(boot_mem_map.map[i].addr);
+ end = PFN_DOWN(boot_mem_map.map[i].addr
+ + boot_mem_map.map[i].size);
+
+ memory_present(0, start, end);
+ }
}
#endif /* CONFIG_SGI_IP27 */
diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c
index 480dec0..9bc6d35 100644
--- a/arch/mips/mm/init.c
+++ b/arch/mips/mm/init.c
@@ -417,6 +417,9 @@ void __init mem_init(void)
for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
struct page *page = pfn_to_page(tmp);
+ if (!pfn_valid(tmp))
+ continue;
+
if (!page_is_ram(tmp)) {
SetPageReserved(page);
continue;
diff --git a/include/asm-mips/sparsemem.h b/include/asm-mips/sparsemem.h
index 795ac6c..67245cb 100644
--- a/include/asm-mips/sparsemem.h
+++ b/include/asm-mips/sparsemem.h
@@ -6,7 +6,7 @@
* SECTION_SIZE_BITS 2^N: how big each section will be
* MAX_PHYSMEM_BITS 2^N: how much memory we can have in that space
*/
-#define SECTION_SIZE_BITS 28
+#define SECTION_SIZE_BITS 27
#define MAX_PHYSMEM_BITS 35
#endif /* CONFIG_SPARSEMEM */
--
1.5.4.1
