user/sven/linux.git/Documentation, branch v5.4.70

block/diskstats: more accurate approximation of io_ticks for slow disks

2020-10-07T06:01:29Z

commit 2b8bd423614c595540eaadcfbc702afe8e155e50 upstream. Currently io_ticks is approximated by adding one at each start and end of requests if jiffies counter has changed. This works perfectly for requests shorter than a jiffy or if one of requests starts/ends at each jiffy. If disk executes just one request at a time and they are longer than two jiffies then only first and last jiffies will be accounted. Fix is simple: at the end of request add up into io_ticks jiffies passed since last update rather than just one jiffy. Example: common HDD executes random read 4k requests around 12ms. fio --name=test --filename=/dev/sdb --rw=randread --direct=1 --runtime=30 & iostat -x 10 sdb Note changes of iostat's "%util" 8,43% -> 99,99% before/after patch: Before: Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util sdb 0,00 0,00 82,60 0,00 330,40 0,00 8,00 0,96 12,09 12,09 0,00 1,02 8,43 After: Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util sdb 0,00 0,00 82,50 0,00 330,00 0,00 8,00 1,00 12,10 12,10 0,00 12,12 99,99 Now io_ticks does not loose time between start and end of requests, but for queue-depth > 1 some I/O time between adjacent starts might be lost. For load estimation "%util" is not as useful as average queue length, but it clearly shows how often disk queue is completely empty. Fixes: 5b18b5a73760 ("block: delete part_round_stats and switch to less precise counting") Signed-off-by: Konstantin Khlebnikov Reviewed-by: Ming Lei Signed-off-by: Jens Axboe From: "Banerjee, Debabrata" Signed-off-by: Greg Kroah-Hartman

gpio/aspeed-sgpio: enable access to all 80 input & output sgpios

2020-10-07T06:01:28Z

[ Upstream commit ac67b07e268d46eba675a60c37051bb3e59fd201 ] Currently, the aspeed-sgpio driver exposes up to 80 GPIO lines, corresponding to the 80 status bits available in hardware. Each of these lines can be configured as either an input or an output. However, each of these GPIOs is actually an input *and* an output; we actually have 80 inputs plus 80 outputs. This change expands the maximum number of GPIOs to 160; the lower half of this range are the input-only GPIOs, the upper half are the outputs. We fix the GPIO directions to correspond to this mapping. This also fixes a bug when setting GPIOs - we were reading from the input register, making it impossible to set more than one output GPIO. Signed-off-by: Jeremy Kerr Fixes: 7db47faae79b ("gpio: aspeed: Add SGPIO driver") Reviewed-by: Joel Stanley Reviewed-by: Andrew Jeffery Acked-by: Rob Herring Signed-off-by: Bartosz Golaszewski Signed-off-by: Sasha Levin

ata: make qc_prep return ata_completion_errors

2020-10-01T11:18:26Z

commit 95364f36701e62dd50eee91e1303187fd1a9f567 upstream. In case a driver wants to return an error from qc_prep, return enum ata_completion_errors. sata_mv is one of those drivers -- see the next patch. Other drivers return the newly defined AC_ERR_OK. [v2] use enum ata_completion_errors and AC_ERR_OK. Signed-off-by: Jiri Slaby Cc: Jens Axboe Cc: linux-ide@vger.kernel.org Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman

dt-bindings: sound: wm8994: Correct required supplies based on actual implementaion

2020-10-01T11:17:58Z

[ Upstream commit 8c149b7d75e53be47648742f40fc90d9fc6fa63a ] The required supplies in bindings were actually not matching implementation making the bindings incorrect and misleading. The Linux kernel driver requires all supplies to be present. Also for wlf,wm8994 uses just DBVDD-supply instead of DBVDDn-supply (n: <1,3>). Reported-by: Jonathan Bakker Signed-off-by: Krzysztof Kozlowski Link: https://lore.kernel.org/r/20200501133534.6706-1-krzk@kernel.org Signed-off-by: Mark Brown Signed-off-by: Sasha Levin

affs: fix basic permission bits to actually work

2020-09-09T17:12:34Z

commit d3a84a8d0dde4e26bc084b36ffcbdc5932ac85e2 upstream. The basic permission bits (protection bits in AmigaOS) have been broken in Linux' AFFS - it would only set bits, but never delete them. Also, contrary to the documentation, the Archived bit was not handled. Let's fix this for good, and set the bits such that Linux and classic AmigaOS can coexist in the most peaceful manner. Also, update the documentation to represent the current state of things. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: stable@vger.kernel.org Signed-off-by: Max Staudt Signed-off-by: David Sterba Signed-off-by: Greg Kroah-Hartman

mmc: dt-bindings: Add resets/reset-names for Mediatek MMC bindings

2020-09-09T17:12:33Z

commit 65557383191de46611dd3d6b639cbcfbade43c4a upstream. Add description for resets/reset-names. Cc: # v5.4+ Fixes: 966580ad236e ("mmc: mediatek: add support for MT7622 SoC") Signed-off-by: Wenbin Mei Tested-by: Frank Wunderlich Link: https://lore.kernel.org/r/20200814014346.6496-2-wenbin.mei@mediatek.com Signed-off-by: Ulf Hansson Signed-off-by: Greg Kroah-Hartman

dt-bindings: mmc: tegra: Add tmclk for Tegra210 and later

2020-09-05T09:22:50Z

commit f7f86e8ac0ad7cd6792a80137f5a550924966916 upstream. commit b5a84ecf025a ("mmc: tegra: Add Tegra210 support") Tegra210 and later uses separate SDMMC_LEGACY_TM clock for data timeout. So, this patch adds "tmclk" to Tegra sdhci clock property in the device tree binding. Fixes: b5a84ecf025a ("mmc: tegra: Add Tegra210 support") Cc: stable # 5.4 Reviewed-by: Jon Hunter Signed-off-by: Sowjanya Komatineni Link: https://lore.kernel.org/r/1598548861-32373-4-git-send-email-skomatineni@nvidia.com Signed-off-by: Ulf Hansson Signed-off-by: Greg Kroah-Hartman

kbuild: support LLVM=1 to switch the default tools to Clang/LLVM

2020-08-26T08:40:47Z

commit a0d1c951ef08ed24f35129267e3595d86f57f5d3 upstream. As Documentation/kbuild/llvm.rst implies, building the kernel with a full set of LLVM tools gets very verbose and unwieldy. Provide a single switch LLVM=1 to use Clang and LLVM tools instead of GCC and Binutils. You can pass it from the command line or as an environment variable. Please note LLVM=1 does not turn on the integrated assembler. You need to pass LLVM_IAS=1 to use it. When the upstream kernel is ready for the integrated assembler, I think we can make it default. We discussed what we need, and we agreed to go with a simple boolean flag that switches both target and host tools: https://lkml.org/lkml/2020/3/28/494 https://lkml.org/lkml/2020/4/3/43 Some items discussed, but not adopted: - LLVM_DIR When multiple versions of LLVM are installed, I just thought supporting LLVM_DIR=/path/to/my/llvm/bin/ might be useful. CC = $(LLVM_DIR)clang LD = $(LLVM_DIR)ld.lld ... However, we can handle this by modifying PATH. So, we decided to not do this. - LLVM_SUFFIX Some distributions (e.g. Debian) package specific versions of LLVM with naming conventions that use the version as a suffix. CC = clang$(LLVM_SUFFIX) LD = ld.lld(LLVM_SUFFIX) ... will allow a user to pass LLVM_SUFFIX=-11 to use clang-11 etc., but the suffixed versions in /usr/bin/ are symlinks to binaries in /usr/lib/llvm-#/bin/, so this can also be handled by PATH. Signed-off-by: Masahiro Yamada Reviewed-by: Nathan Chancellor Tested-by: Nathan Chancellor # build Tested-by: Nick Desaulniers Reviewed-by: Nick Desaulniers Signed-off-by: Nick Desaulniers Signed-off-by: Greg Kroah-Hartman

kbuild: replace AS=clang with LLVM_IAS=1

2020-08-26T08:40:47Z

commit 7e20e47c70f810d678d02941fa3c671209c4ca97 upstream. The 'AS' variable is unused for building the kernel. Only the remaining usage is to turn on the integrated assembler. A boolean flag is a better fit for this purpose. AS=clang was added for experts. So, I replaced it with LLVM_IAS=1, breaking the backward compatibility. Suggested-by: Nick Desaulniers Signed-off-by: Masahiro Yamada Reviewed-by: Nathan Chancellor Reviewed-by: Nick Desaulniers Signed-off-by: Nick Desaulniers Signed-off-by: Greg Kroah-Hartman

Documentation/llvm: fix the name of llvm-size

2020-08-26T08:40:46Z

commit 0f44fbc162b737ff6251ae248184390ae2279fee upstream. The tool is called llvm-size, not llvm-objsize. Fixes: fcf1b6a35c16 ("Documentation/llvm: add documentation on building w/ Clang/LLVM") Signed-off-by: Fangrui Song Reviewed-by: Nick Desaulniers Reviewed-by: Nathan Chancellor Signed-off-by: Masahiro Yamada Signed-off-by: Nick Desaulniers Signed-off-by: Greg Kroah-Hartman