mirror of
https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-10.git
synced 2026-09-09 00:07:04 +08:00
Mamatha Inamdar
0ba4e785e8
JIRA: https://issues.redhat.com/browse/RHEL-190876 commit 972a7b78722cd2faee75148278322d844f4274bb Author: Mahesh Salgaonkar <mahesh@linux.ibm.com> Date: Thu Aug 6 10:41:17 2026 +0530 powerpc/pseries: Limit PVR list to 16 entries for CAS negotiation Current Power system firmware caps the PVR list array size at 16 entries during CAS (Client Architecture Support) negotiation. Passing more than capped size to older firmware could cause an undefined behaviour and breaks compatibility. Future Power system firmware releases will lift this restriction and support greater than 16 array entries. Ensure that when running on Power11 or below hardware, the number of PVR entries passed during CAS negotiation does not exceed the firmware-imposed limit of 16. In prom_send_capabilities(), compute start_index to skip the oldest leading pvrs[] entries when running on Power11 or below hardware, so that the pointer passed to ibm,client-architecture-support points to ibm_architecture_vec.pvrs[start_index], presenting exactly 16 entries to firmware. Signed-off-by: Mahesh Salgaonkar <mahesh@linux.ibm.com> Tested-by: Praveen K Pandey <praveen@linux.ibm.com> Reviewed-by: Nikhil Kumar Singh <nikhilks@linux.ibm.com> Reviewed-by: Amit Machhiwal <amachhiw@linux.ibm.com> Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com> Link: https://patch.msgid.link/20260806051120.3703698-2-mahesh@linux.ibm.com Signed-off-by: Mamatha Inamdar <minamdar@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.