ACK: [J][PATCH v2 0/2] Long kernel command line on s390x (LP: 1960580)

[Tim Gardner]

Acked-by: Tim Gardner <tim.gardner at canonical.com>

On 2/17/22 12:02 PM, frank.heimes at canonical.com wrote:
> BugLink: https://bugs.launchpad.net/bugs/1960580
> 
> Allow to handle command lines with a length of up to 4096 bytes by kernel.
> It happened in the past that our supported command line size of 896 bytes
> was sometimes too short - while x86, powerpc, and arm each support 2048 bytes.
> 
> This requires:
>   - an ABI interface to the kernel image, so that tools can figure out if the
>     kernel supports large command lines (might be a feature bitmap at a fixed
>     location)
>   - zipl, genprotimg, qemu, kexec-tools and changes (depending on the kernel
>     side implementation)
>   - in-kernel ipl support changes (IPL from reader)
> 
> v2: converted 277c8389386e ("390/kexec_file: move kernel image size check")
>      into a backport, due to required context adjustments
> 
> Sven Schnelle (2):
>    s390/kexec_file: move kernel image size check
>    s390: support command lines longer than 896 bytes
> 
>   arch/s390/boot/head.S                 | 37 +++++++++------------------
>   arch/s390/boot/ipl_parm.c             |  4 +--
>   arch/s390/include/asm/setup.h         |  8 +++---
>   arch/s390/include/uapi/asm/setup.h    |  2 --
>   arch/s390/kernel/asm-offsets.c        |  1 +
>   arch/s390/kernel/early.c              |  2 +-
>   arch/s390/kernel/machine_kexec_file.c | 35 +++++++++++++------------
>   7 files changed, 39 insertions(+), 50 deletions(-)
> 

-- 
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Tim Gardner
Canonical, Inc