lkml.org 
[lkml]   [2005]   [Dec]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH] x86_64: acpi map table fix


o Memory till end_pfn_map has been directly mapped. So all the memory
references to the last page (represented by end_pfn_map) should be
valid.

o I run into problem with kdump when I use memmap=exactmap option and also
pass memmap=X#Y to directly map acpi tables. ACPI initialization in second
kernel fails because some of the valid ACPI memory is not accessible.

o /proc/iomem shows ACPI tables at c7fcb940-c7fcf7ff : ACPI Tables. Here
end_pfn_map is set to c7fcf000. But c7fcf700 should also be a valid access.

Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
---


diff -puN arch/i386/kernel/acpi/boot.c~acpi-map-address-fix arch/i386/kernel/acpi/boot.c
--- linux-2.6.15-rc5-mm1-16M/arch/i386/kernel/acpi/boot.c~acpi-map-address-fix 2005-12-07 15:56:33.000000000 +0530
+++ linux-2.6.15-rc5-mm1-16M-root/arch/i386/kernel/acpi/boot.c 2005-12-07 15:58:04.000000000 +0530
@@ -108,7 +108,7 @@ char *__acpi_map_table(unsigned long phy
if (!phys_addr || !size)
return NULL;

- if (phys_addr < (end_pfn_map << PAGE_SHIFT))
+ if (phys_addr < ((end_pfn_map << PAGE_SHIFT) + PAGE_SIZE))
return __va(phys_addr);

return NULL;
_
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
\
 
 \ /
  Last update: 2005-12-08 05:17    [W:2.099 / U:0.008 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site