diff options
| author | Dave Young <dyoung@redhat.com> | 2012-10-18 11:16:08 +0800 |
|---|---|---|
| committer | Simon Horman <horms@verge.net.au> | 2012-10-19 10:33:17 +0900 |
| commit | 75d1a16f0b4e5b33e91a51d93014f1fd8303f36e (patch) | |
| tree | 42ce4b3a72943d72fa7f29c70593d3e32c8acdb7 /vmcore-dmesg | |
| parent | aaedd5321b239a919a080da84ed5c96fb4481ed2 (diff) | |
kdump: pass acpi_rsdp= to 2nd kernel for efi booting
In case efi booting, kdump need kernel parameter acpi_rsdp= to retrieve
the acpi root table physical address.
Add a function cmdline_add_efi to get the address from /sys/firmware/efi/systab
If there's no such file or read fail the function will just do nothing.
Tested efi boot Fedora 17 on thinkpad T420.
Some background info for this issue:
http://lists.infradead.org/pipermail/kexec/2010-March/003889.html
[v1 -> v2]:
Address comments from Khalid and Simon
use fgets instead of read(2) to iterate the file
do not add 'noefi' because kexec does not construct EFI signature
in bootloader signature in boot_params, so kexec'd kernel will
disable EFI automatically even without noefi.
Signed-off-by: Dave Young <dyoung@redhat.com>
Reviewed-by: Khalid Aziz <khalid@gonehiking.org>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
Diffstat (limited to 'vmcore-dmesg')
0 files changed, 0 insertions, 0 deletions