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Bodo Stroesser e6309b813b scsi: target: tcmu: Optimize use of flush_dcache_page 
commit 3c58f73723 upstream.

(scatter|gather)_data_area() need to flush dcache after writing data to or
before reading data from a page in uio data area.  The two routines are
able to handle data transfer to/from such a page in fragments and flush the
cache after each fragment was copied by calling the wrapper
tcmu_flush_dcache_range().

That means:

1) flush_dcache_page() can be called multiple times for the same page.

2) Calling flush_dcache_page() indirectly using the wrapper does not make
   sense, because each call of the wrapper is for one single page only and
   the calling routine already has the correct page pointer.

Change (scatter|gather)_data_area() such that, instead of calling
tcmu_flush_dcache_range() before/after each memcpy, it now calls
flush_dcache_page() before unmapping a page (when writing is complete for
that page) or after mapping a page (when starting to read the page).

After this change only calls to tcmu_flush_dcache_range() for addresses in
vmalloc'ed command ring are left over.

The patch was tested on ARM with kernel 4.19.118 and 5.7.2

Link: https://lore.kernel.org/r/20200618131632.32748-2-bstroesser@ts.fujitsu.com
Tested-by: JiangYu <lnsyyj@hotmail.com>
Tested-by: Daniel Meyerholt <dxm523@gmail.com>
Acked-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Bodo Stroesser <bstroesser@ts.fujitsu.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-09-09 19:04:22 +02:00
arch powerpc/perf: Fix soft lockups due to missed interrupt accounting 2020-09-03 11:24:26 +02:00
block blk-mq: order adding requests to hctx->dispatch and checking SCHED_RESTART 2020-09-03 11:24:26 +02:00
certs export.h: remove VMLINUX_SYMBOL() and VMLINUX_SYMBOL_STR() 2018-08-22 23:21:44 +09:00
crypto crypto: af_alg - fix use-after-free in af_alg_accept() due to bh_lock_sock() 2020-07-09 09:37:10 +02:00
Documentation dt-bindings: iio: io-channel-mux: Fix compatible string in example code 2020-08-21 11:05:30 +02:00
drivers scsi: target: tcmu: Optimize use of flush_dcache_page 2020-09-09 19:04:22 +02:00
firmware Fix built-in early-load Intel microcode alignment 2020-01-23 08:21:29 +01:00
fs btrfs: check the right error variable in btrfs_del_dir_entries_in_log 2020-09-03 11:24:31 +02:00
include HID: core: Sanitize event code and type when mapping input 2020-09-09 19:04:22 +02:00
init printk: queue wake_up_klogd irq_work only if per-CPU areas are ready 2020-07-22 09:32:13 +02:00
ipc ipc/util.c: sysvipc_find_ipc() incorrectly updates position index 2020-05-20 08:18:40 +02:00
kernel genirq/matrix: Deal with the sillyness of for_each_cpu() on UP 2020-09-03 11:24:29 +02:00
lib test_kmod: avoid potential double free in trigger_config_run_type() 2020-08-21 11:05:38 +02:00
LICENSES LICENSES: Remove CC-BY-SA-4.0 license text 2018-10-18 11:28:50 +02:00
mm mm/hugetlb: fix calculation of adjust_range_if_pmd_sharing_possible 2020-08-26 10:31:06 +02:00
net tipc: fix uninit skb->data in tipc_nl_compat_dumpit() 2020-09-03 11:24:17 +02:00
samples samples: bpf: Fix build error 2020-06-03 08:19:31 +02:00
scripts kconfig: qconf: fix signal connection to invalid slots 2020-08-26 10:31:04 +02:00
security Smack: prevent underflow in smk_set_cipso() 2020-08-19 08:14:59 +02:00
sound ALSA: usb-audio: Update documentation comment for MS2109 quirk 2020-09-03 11:24:31 +02:00
tools perf record/stat: Explicitly call out event modifiers in the documentation 2020-09-09 19:04:22 +02:00
usr initramfs: restore default compression behavior 2020-04-13 10:44:59 +02:00
virt KVM: arm64: Only reschedule if MMU_NOTIFIER_RANGE_BLOCKABLE is not set 2020-08-26 10:31:07 +02:00
.clang-format clang-format: Set IndentWrappedFunctionNames false 2018-08-01 18:38:51 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap libnvdimm-for-4.19_misc 2018-08-25 18:13:10 -07:00
COPYING
CREDITS 9p: remove Ron Minnich from MAINTAINERS 2018-08-17 16:20:26 -07:00
Kbuild
Kconfig kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt 2018-08-02 08:06:55 +09:00
MAINTAINERS MAINTAINERS: Update drm/i915 bug filing URL 2020-02-28 16:38:49 +01:00
Makefile Linux 4.19.143 2020-09-03 11:24:31 +02:00
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.
See Documentation/00-INDEX for a list of what is contained in each file.

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.