mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-05-03 18:12:25 -04:00
58bf14c17e
Increasing the per-request size maximum (max_sectors_kb) runs into the per-device DMA scatter gather list limit (max_segments) for users of the io vector system calls (eg, readv and writev). This is because the kernel combines io vectors into DMA segments when possible, but it doesn't work for our user because the vectors in the buffer cache get scrambled. This change bumps the advertised max scatter gather length to 528 to cover 2M w/ x86's 4k pages and some extra for the user checksum. It trims the size of some of the tables we don't care about and exposes all of the command slots upstream to the SCSI layer. Also reduced the PM8001_MAX_CCB to 256 as pm8001 driver has memory limit depend on machine capability. If we increase the sg length, we need to trade-off it by decreasing PM8001_MAX_CCB. PM8001_MAX_CCB = 256 does not have any influence on normal use Link: https://lore.kernel.org/r/20200316074906.9119-2-deepak.ukey@microchip.com Reported-by: kbuild test robot <lkp@intel.com> Acked-by: Jack Wang <jinpu.wang@cloud.ionos.com> Signed-off-by: Peter Chang <dpf@google.com> Signed-off-by: Deepak Ukey <deepak.ukey@microchip.com> Signed-off-by: Viswas G <Viswas.G@microchip.com> Signed-off-by: Radha Ramachandran <radha@google.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.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 Restructured Text 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.