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authorVivek Goyal <vgoyal@in.ibm.com>2006-06-01 20:39:02 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2006-06-27 09:24:00 -0700
commit87937472ff8e34ad5c7b798a8a52e4368af216df (patch)
treeaac98d01aa5395da04243c53b0983eb104df08a2
parent6550e07f41ce8473ed684dac54fbfbd42183ffda (diff)
[PATCH] i386: export memory more than 4G through /proc/iomem
Currently /proc/iomem exports physical memory also apart from io device memory. But on i386, it truncates any memory more than 4GB. This leads to problems for kexec/kdump. Kexec reads /proc/iomem to determine the system memory layout and prepares a memory map based on that and passes it to the kernel being kexeced. Given the fact that memory more than 4GB has been truncated, new kernel never gets to see and use that memory. Kdump also reads /proc/iomem to determine the physical memory layout of the system and encodes this informaiton in ELF headers. After a crash new kernel parses these ELF headers being used by previous kernel and vmcore is prepared accordingly. As memory more than 4GB has been truncated, kdump never sees that memory and never prepares ELF headers for it. Hence vmcore is truncated and limited to 4GB even if there is more physical memory in the system. This patch exports memory more than 4GB through /proc/iomem on i386. Cc: Maneesh Soni <maneesh@in.ibm.com> Cc: Vivek Goyal <vgoyal@in.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--arch/i386/kernel/setup.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c
index 4a65040cc62..6712f0d2eb3 100644
--- a/arch/i386/kernel/setup.c
+++ b/arch/i386/kernel/setup.c
@@ -1314,8 +1314,10 @@ legacy_init_iomem_resources(struct resource *code_resource, struct resource *dat
probe_roms();
for (i = 0; i < e820.nr_map; i++) {
struct resource *res;
+#ifndef CONFIG_RESOURCES_64BIT
if (e820.map[i].addr + e820.map[i].size > 0x100000000ULL)
continue;
+#endif
res = kzalloc(sizeof(struct resource), GFP_ATOMIC);
switch (e820.map[i].type) {
case E820_RAM: res->name = "System RAM"; break;