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Filename Latest commit message Latest commit date
Arvind Sankar 2c490a4730 efi/earlycon: Fix write-combine mapping on x86 
commit d92b54570d24d017d2630e314b525ed792f5aa6c upstream.

On x86, until PAT is initialized, WC translates into UC-. Since we
calculate and store pgprot_writecombine(PAGE_KERNEL) when earlycon is
initialized, this means we actually use UC- mappings instead of WC
mappings, which makes scrolling very slow.

Instead store a boolean flag to indicate whether we want to use
writeback or write-combine mappings, and recalculate the actual pgprot_t
we need on every mapping. Once PAT is initialized, we will start using
write-combine mappings, which speeds up the scrolling considerably.

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Fixes: 69c1f396f2 ("efi/x86: Convert x86 EFI earlyprintk into generic earlycon implementation")
Link: https://lkml.kernel.org/r/20191224132909.102540-2-ardb@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-01-23 08:22:38 +01:00
arch x86/resctrl: Fix potential memory leak 2020-01-23 08:22:38 +01:00
block block: fix an integer overflow in logical block size 2020-01-23 08:22:32 +01:00
certs
crypto
Documentation
drivers efi/earlycon: Fix write-combine mapping on x86 2020-01-23 08:22:38 +01:00
fs io_uring: only allow submit from owning task 2020-01-23 08:22:32 +01:00
include block: fix an integer overflow in logical block size 2020-01-23 08:22:32 +01:00
init
ipc
kernel locking/rwsem: Fix kernel crash when spinning on RWSEM_OWNER_UNKNOWN 2020-01-23 08:22:37 +01:00
lib
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mm
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samples
scripts
security
sound ALSA: usb-audio: fix sync-ep altsetting sanity check 2020-01-23 08:22:31 +01:00
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Makefile Linux 5.4.13 2020-01-17 19:49:08 +01:00
README

README 

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.