linux-kernel - [PATCH 1/4] x86_64: Switch to SPARSE

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20070401071029.23757.78021.sendpatchset@schroedinger.engr.sgi.com>
Date:	Sat, 31 Mar 2007 23:10:29 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-arch@...r.kernel.org, Martin Bligh <mbligh@...gle.com>,
	linux-mm@...ck.org, Andi Kleen <ak@...e.de>,
	Christoph Lameter <clameter@....com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: [PATCH 1/4] x86_64: Switch to SPARSE_VIRTUAL

x86_64 make SPARSE_VIRTUAL the default

x86_64 is using 2M page table entries to map its 1-1 kernel space.
We implement the virtual memmap also using 2M page table entries.
So there is no difference at all to FLATMEM. Both schemes require
a page table and a TLB.

Thus the SPARSEMEM becomes the most efficient way of handling
virt_to_page, pfn_to_page and friends for UP, SMP and NUMA.

So change the Kconfig for x86_64 to make SPARSE_VIRTUAL the
default and switch off all other memory models.

Oh. And PFN_TO_PAGE used to be out of line. Since it is now
so simple switch it back to inline.

Signed-off-by: Christoph Lameter <clameter@....com>

Index: linux-2.6.21-rc5-mm2/arch/x86_64/Kconfig
===================================================================
--- linux-2.6.21-rc5-mm2.orig/arch/x86_64/Kconfig	2007-03-31 23:47:58.000000000 -0700
+++ linux-2.6.21-rc5-mm2/arch/x86_64/Kconfig	2007-03-31 23:48:41.000000000 -0700
@@ -380,25 +380,29 @@ config NUMA_EMU
 	  number of nodes. This is only useful for debugging.
 
 config ARCH_DISCONTIGMEM_ENABLE
-       bool
-       depends on NUMA
-       default y
+       def_bool n
 
 config ARCH_DISCONTIGMEM_DEFAULT
-	def_bool y
-	depends on NUMA
+	def_bool n
 
 config ARCH_SPARSEMEM_ENABLE
 	def_bool y
-	depends on (NUMA || EXPERIMENTAL)
+
+config SPARSEMEM_MANUAL
+	def_bool y
+
+config ARCH_SPARSE_VIRTUAL
+	def_bool y
+
+config SELECT_MEMORY_MODEL
+	def_bool n
 
 config ARCH_MEMORY_PROBE
 	def_bool y
 	depends on MEMORY_HOTPLUG
 
 config ARCH_FLATMEM_ENABLE
-	def_bool y
-	depends on !NUMA
+	def_bool n
 
 source "mm/Kconfig"
 
@@ -411,8 +415,7 @@ config HAVE_ARCH_EARLY_PFN_TO_NID
 	depends on NUMA
 
 config OUT_OF_LINE_PFN_TO_PAGE
-	def_bool y
-	depends on DISCONTIGMEM
+	def_bool n
 
 config NR_CPUS
 	int "Maximum number of CPUs (2-255)"
Index: linux-2.6.21-rc5-mm2/include/asm-x86_64/page.h
===================================================================
--- linux-2.6.21-rc5-mm2.orig/include/asm-x86_64/page.h	2007-03-31 23:47:58.000000000 -0700
+++ linux-2.6.21-rc5-mm2/include/asm-x86_64/page.h	2007-03-31 23:48:41.000000000 -0700
@@ -135,6 +135,7 @@ typedef struct { unsigned long pgprot; }
 	 VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 
 #define __HAVE_ARCH_GATE_AREA 1	
+#define vmemmap ((struct page *)0xffffe20000000000UL)
 
 #include <asm-generic/memory_model.h>
 #include <asm-generic/page.h>
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/