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ACPI: Overriding ACPI tables via initrd only works with an initrd and on X86

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Reflect this dependency in Kconfig, to prevent build failures.

Shorten the config description as suggested by Borislav Petkov.

Finding a suitable memory area to store the modified table(s) has been
taken over from arch/x86/kernel/setup.c and makes use of max_low_pfn_mapped:
memblock_find_in_range(0, max_low_pfn_mapped,...)
This one is X86 specific. It may not be hard to extend this functionality
for other ACPI aware architectures if there is need for.

For now make this feature only available for X86 to avoid build failures on
IA64, compare with:
https://bugzilla.kernel.org/show_bug.cgi?id=54091

Signed-off-by: Thomas Renninger <trenn@suse.de>
Link: http://lkml.kernel.org/r/1361538742-67599-3-git-send-email-trenn@suse.de
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Thomas Renninger 2013-02-22 14:12:22 +01:00 committed by H. Peter Anvin
parent a8aed3e075
commit 565d956a7e
1 changed files with 2 additions and 1 deletions
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3
drivers/acpi/Kconfig
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@ -268,7 +268,8 @@ config ACPI_CUSTOM_DSDT
default ACPI_CUSTOM_DSDT_FILE != ""
config ACPI_INITRD_TABLE_OVERRIDE
bool "ACPI tables can be passed via uncompressed cpio in initrd"
bool "ACPI tables override via initrd"
depends on BLK_DEV_INITRD && X86
default n
help
This option provides functionality to override arbitrary ACPI tables