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On an ARM64 A1 system, it's possible to have physical memory span up to the 64T boundary, like below $ lsmem -b -r -n -o range,size 0x0000000080000000-0x00000000bfffffff 1073741824 0x0000080000000000-0x000008007fffffff 2147483648 0x00000800c0000000-0x0000087fffffffff 546534588416 0x0000400000000000-0x00004000bfffffff 3221225472 0x0000400100000000-0x0000407fffffffff 545460846592 So it's time to extend /sys/kernel/mm/page_idle/bitmap to be able to account for >2G number of pages, by raising the kernfs file size limit. Signed-off-by: Jane Chu <jane.chu@oracle.com> Link: https://patch.msgid.link/20251111202606.1505437-1-jane.chu@oracle.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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.