Commit Graph

338 Commits

Author SHA1 Message Date
AmadeusGhost
398ea52770 [HOT FIX] Merge Mainline 2022-04-03 00:50:22 +08:00
Richard Huynh
e1e8afc646 mediatek: Add support for Xiaomi Redmi Router AX6S
Also known as the "Xiaomi Router AX3200" in western markets,
but only the AX6S is widely installation-capable at this time.

SoC: MediaTek MT7622B
RAM: DDR3 256 MiB (ESMT M15T2G16128A)
Flash: SPI-NAND 128 MiB (ESMT F50L1G41LB or Gigadevice GD5F1GQ5xExxG)
WLAN: 2.4/5 GHz 4T4R
2.4 GHz: MediaTek MT7622B
5 GHz: MediaTek MT7915E
Ethernet: 4x 10/100/1000 Mbps
Switch: MediaTek MT7531B
LEDs/Keys: 2/2 (Internet + System LED, Mesh button + Reset pin)
UART: Marked J1 on board VCC RX GND TX, beginning from "1". 3.3v, 115200n8
Power: 12 VDC, 1.5 A

Notes:
U-Boot passes through the ethaddr from uboot-env partition,
but also has been known to reset it to a generic mac address
hardcoded in the bootloader.

However, bdata is also populated with the ethernet mac addresses,
but is also typically never written to. Thus this is used instead.

Installation:
1. Flash stock Xiaomi "closed beta" image labelled
'miwifi_rb03_firmware_stable_1.2.7_closedbeta.bin'.
(MD5: 5eedf1632ac97bb5a6bb072c08603ed7)

2. Calculate telnet password from serial number and login

3. Execute commands to prepare device
nvram set ssh_en=1
nvram set uart_en=1
nvram set boot_wait=on
nvram set flag_boot_success=1
nvram set flag_try_sys1_failed=0
nvram set flag_try_sys2_failed=0
nvram commit

4. Download and flash image
On computer:
python -m http.server
On router:
cd /tmp
wget http://<IP>:8000/factory.bin
mtd -r write factory.bin firmware

Device should reboot at this point.

Reverting to stock:
Stock Xiaomi recovery tftp that accepts their signed images,
with default ips of 192.168.31.1 + 192.168.31.100.
Stock image should be renamed to tftp server ip in hex (Eg. C0A81F64.img)
Triggered by holding reset pin on powerup.

A simple implementation of this would be via dnsmasq's
dhcp-boot option or using the vendor's (Windows only)
recovery tool available on their website.

Signed-off-by: Richard Huynh <voxlympha@gmail.com>
2022-03-21 11:50:29 +08:00
Richard Huynh
f868dd5336 mediatek: Add GD5F1GQ5xExxG to mtk-snand
Some units of the Xiaomi Redmi Router AX6S/Xiaomi Router AX3200 contain this part.

Signed-off-by: Richard Huynh <voxlympha@gmail.com>
2022-03-21 11:50:07 +08:00
INAGAKI Hiroshi
e5a58b88ce kernel: move parser_trx patches of custom magic to generic
This patch moves the patches of parser_trx in mediatek target to
generic/backport-5.10 to use the changes from ramips target and
backport the additional patch of the parser.

Signed-off-by: INAGAKI Hiroshi <musashino.open@gmail.com>
2022-03-11 23:37:36 +08:00
Langhua Ye
297d82c870 mediatek: add support for Ruijie RG-EW3200GX PRO
X32 Pro is another product  name for it in the Chinese market.

Specifications:
- SoC: MT7622B
- RAM: 256MB
- Flash: XMC XM25QH128C or Winbond WQ25Q128JVSQ 16MB SPI NOR
- Ethernet: 5x1GbE
- Switch: MT7531BE
- WiFi: 2.4G: MT7622 5G: MT7915AN+MT7975AN
- 3LEDs: System LED(blue) + Mesh LED(green) + Mesh LED(red)
- 2Keys: Mesh button + Reset button
- UART: Marked J19 on board. 3.3v, 115200n1
- Power: 12V 2.5A

MAC addresses as verified by OEM firmware:
use   address    source
WAN   *:F4       ethaddr@product_info
LAN   *:F5
5g    *:F6
2g    *:F7

Flash instruction:
1. Serve the initramfs.img using a TFTP server with address 10.10.10.3.
2. Interrupt the uboot startup process via UART.
3. Select "System Load Linux to SDRAM via TFTP" item.
4. (important) Back up firmware(mtd7) partitions with:
        dd if=/dev/mtd7 of=/tmp/firmware.bin
   and then download the firmware.bin image via SCP.
5. Flash the OpenWrt sysupgrade firmware.

Recovery stock firmware:
1. Transfer the firmware.bin image to the device.
2. Flash the image with:
        mtd write firmware.bin firmware

Signed-off-by: Langhua Ye <y1248289414@outlook.com>
2022-03-10 09:02:04 +08:00
Daniel Golle
a8ce403965 mediatek: mt7623: include regular AHCI PCI driver
The legacy image for the UniElec U7623-02 until now included
kmod-ata-ahci-mtk. The MT7623 chip doesn't have that IP and that
board uses a PCIe-connected AHCI controller for the SATA port and
mSATA-pins of the mPCIe socket. Hence include kmod-ata-ahci instead.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2022-02-14 18:34:06 +08:00
Daniel Golle
ae65eb3e8d mediatek: store random MAC address in U-Boot env on first boot
For devboards without a MAC address assigned from factory, store
the random MAC in U-Boot env on first boot to make it persistent.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2022-02-14 18:32:54 +08:00
Daniel Golle
c29f6b6cd8 uboot-envtools: add configuration for UniElec U7623 board
Add U-Boot env settings to allow accessing the environment using
fw_printenv and fw_setenv tools on the UniElec U7623 board.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2022-02-14 18:32:31 +08:00
Daniel Golle
488d6c46ef mediatek: mt7623: rework images for U7623-02 board
Users of older OpenWrt versions need sysupgrade using the *emmc.img.gz
file once which will upgrade U-Boot and switch to the new image layout.
Users of the vendor firmware need to first flash the legacy image to
then sunsequently carry out a full-flash upgrade.

Alternatively the board can also be flashed using MediaTek's
proprietary SP Flash Tool.

Configuration as well as persistent MAC address will be lost once at
this point and you will have to redo (or restore) all configuration
manually. To restore the previous persistent MAC address users may set
it manually using

fw_setenv ethaddr 00:11:22:33:44:55

For future upgrades once running OpenWrt past this commit, the usual
*sysupgrade.itb file can be used.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2022-02-14 18:32:07 +08:00
Daniel Golle
7e86e3fc8c mediatek: add common DTS aliases for UniElec U7623 board
* Use serial0 instead of serial2 for the only serial port
 * Add LED aliases
 * Add ethernet0 alias to inherit ethaddr from U-Boot env

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2022-02-14 18:30:55 +08:00
Daniel Golle
c3a09bfb54 mediatek: use CONFIG_TARGET_ROOTFS_PARTSIZE
Enable 'rootfs-part' feature to make the size of the partition of the
production image configurable instead of hard-coding it.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2022-02-14 18:22:16 +08:00
Daniel Golle
7069ab9e32 mediatek: mt7623: switch to BPi-R2 to generic eMMC sysugprade
Make use of new functions in emmc.sh to implement sysupgrade on the
BananaPi BPi-R2.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2022-02-12 12:27:12 +08:00
Daniel Golle
3cb1f8c150 mediatek: mt7622: switch to generic eMMC sysupgrade
Use functions in newly introduced emmc.sh for sysupgrade of the
BananaPi BPi-R64.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2022-02-12 12:26:52 +08:00
Daniel Golle
ea8be0ad5c mediatek: mt7622: bpi-r64: rewrite MMC uImage.FIT sysupgrade
Similar to mt7623, also no longer use 'blockdev' and stop relying on
in-kernel partition parsers. Instead, strip off all metadata using
'fwtool' while writing the firmware image and scrape the number of
blocks written from 'dd', then use that block offset to stash the
configuration backup.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2022-02-09 15:51:07 +08:00
Daniel Golle
0b898ff4e2 mediatek: mt7623: re-write sysupgrade uImage.FIT on MMC
Re-reading the partition table doesn't work reliably, it fails if
anything on the device is still in use and it's not trivial to prevent
every possible case of a block device still being in use somehow.

Therefore, instead of relying on the in-kernel partition parser to know
where to write the configuration backup, use OpenWrt's format-agnostic
fwtool to strip off all metadata from the image and count its blocks
while writing. In that way we can know where to write the config backup
without needing the kernel to parse the MBR and FIT structures.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2022-02-09 15:50:45 +08:00
Daniel Golle
1d03277224 mediatek: mt7623: make use of find_mmc_part
Use find_mmc_part instead of previously introduced
get_partition_by_name which requires a custom kernel patch.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2022-02-09 15:45:02 +08:00
Daniel Golle
a7192387f4 mediatek: mt7622: make use of find_mmc_part
Use find_mmc_part instead of previously introduced
get_partition_by_name which requires a custom kernel patch.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2022-02-09 15:44:21 +08:00
Tianling Shen
3d6248d855
kernel: bump to 4.9.297, 4.14.262, 4.19.225
Signed-off-by: Tianling Shen <cnsztl@immortalwrt.org>
2022-01-25 19:40:05 +08:00
Felix Fietkau
1e6897f630 mediatek: rework and fix mt7622-rfb1-ubi support
Limit bmt remapping range to cover everything up to and including the kernel image,
use the rest of the flash area for ubi.
Fix partition table and sysupgrade support

Signed-off-by: Felix Fietkau <nbd@nbd.name>
2022-01-20 12:25:11 +08:00
Felix Fietkau
a2054c5cf7 kernel: move mediatek BMT support patch to generic patches
Preparation for supporting BMT on MT7621. Move source files to the files/
subdirectory in order to simplify maintenance

Signed-off-by: Felix Fietkau <nbd@nbd.name>
2022-01-20 12:23:25 +08:00
David Woodhouse
e54f3b0090 mediatek: mt7623: Enable PCIe bus 0 (and thus SATA) on U7623
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2022-01-17 12:29:05 +08:00
David Woodhouse
2db1c56599 mediatek: mt7623: Re-enable ARM arch timer
CONFIG_ARM_ARCH_TIMER cannot be enabled in the config directly; it is only
selected by CONFIG_HAVE_ARM_ARCH_TIMER. We need to enable the latter in
our config.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Fixes: 4f1c5b01c1 ("mediatek: mt7623: backport musb, improve HDMI console")
2022-01-14 12:23:48 +08:00
David Woodhouse
0520290aa8 mediatek: mt7623: Disable power button reset for U7623-02 board
The Unielec U7623 doesn't have a physical power button; I think it's hard
wired so that it turns on automatically when power is applied (unlike the
Banana Pi R2 which is a pain).

So the 'reset on long press of power button' behaviour that we get when
we enable the PMIC keyboard driver is kind of unhelpful. Disable it.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Fixes: 0d3f3323a2 ("mediatek: mt7623: enable more hardware features")
2022-01-14 12:22:56 +08:00
Fritz D. Ansel
8bd2fb072e mediatek mt7622: fix 300mhz typo in dts
The lowest frequency should be 300MHz, since that is the label
assigned to the OPP in the mt7622.dtsi device tree, while there is one
missing zero in the actual value.

To be clear, the lowest frequency should be 300MHz instead of 30MHz.

As mentioned @dangowrt on the OpenWrt forum there is no benefit in
leaving 30MHz as the lowest frequency.

Signed-off-by: Jip de Beer <gpk6x3591g0l@opayq.com>
Signed-off-by: Fritz D. Ansel <fdansel@yandex.ru>
2022-01-14 12:21:46 +08:00
Daniel Golle
cc4e4f6e28
mediatek: bpi-r64: fix sdcard.img.gz in ImageBuilder
Generating the sdcard.img.gz file requires the initramfs/recovery
image to be present. Use the newly introduced 'append-image-stage'
build command to fix the ImageBuilder for the BPi-R64.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
(cherry picked from commit 210916c9e6)
2022-01-07 14:16:34 +08:00
Daniel Golle
0a4ae57f34 mediatek: mt7623: bpi-r2: add ethernet alias to device tree
Add ethernet0 alias in device tree to make U-Boot inherit the Ethernet
mac address (set via environment variable 'ethaddr') down to Linux.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2021-12-21 23:57:07 +08:00
Rui Salvaterra
0811975706 kernel: bump 5.10 to 5.10.80
Deleted (upstreamed):
ath79/patches-5.10/921-serial-core-add-support-for-boot-console-with-arbitr.patch [1]
bcm53xx/patches-5.10/033-v5.15-0012-ARM-dts-BCM5301X-Fix-memory-nodes-names.patch [2]
lantiq/patches-5.10/0016-mtd-rawnand-xway-Keep-the-driver-compatible-with-on-.patch [3]
lantiq/patches-5.10/0110-MIPS-lantiq-dma-add-small-delay-after-reset.patch [4]
lantiq/patches-5.10/0111-MIPS-lantiq-dma-reset-correct-number-of-channel.patch [5]
lantiq/patches-5.10/0112-MIPS-lantiq-dma-fix-burst-length-for-DEU.patch [6]

Manually rebased:
ipq806x/patches-5.10/0065-arm-override-compiler-flags.patch

[1] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.10.80&id=47462c5e600fbaffd755cd13dedd80d04e41ff83
[2] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.10.80&id=2fde76df1885a6bec04317e457121326070450eb
[3] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.10.80&id=9b366f5221d8aa64b22f35be137a5749326444ce
[4] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.10.80&id=5af57ce8a6155fe3e4270d28d171abf8903bebc0
[5] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.10.80&id=b92a5df2c7adc79a57481445f67de0c1c716581f
[6] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.10.80&id=6b72caabc47011d03f44064452b2c65e8ed18326

Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
2021-12-08 23:59:43 +08:00
Felix Fietkau
99843f7e12 mediatek: enable bmt on mt7622-rfb1
Signed-off-by: Felix Fietkau <nbd@nbd.name>
2021-12-06 23:56:07 +08:00
Chuanhong Guo
8949484aaf mediatek: bmt: use generic mtd api
BMT replaces nand-specific ops for erasing and writing, but the
mtk-snand driver only implements generic mtd api.

Replace erase, block_isbad, block_markbad in mtd_info for generic mtd
drivers.

Fixes: b600aee3ed ("mediatek: attach bmt to the new snand driver")
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
2021-12-06 23:55:46 +08:00
Hauke Mehrtens
75dd716848 kernel: Set some options in generic configuration
Add CONFIG_USB_ETH and CONFIG_PWM_JZ4740 to generic kernel
configuration.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
2021-11-12 00:06:18 +08:00
Daniel Golle
44551c7f93 mediatek: make sure MMC is not busy before commencing sysupgrade
In case of the block device still being in use, re-reading the
partition table fails. In that case, abort sysupgrade to avoid
corrupting the just-written image because of wrong offsets caused
by failure to re-read the partition table.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2021-11-03 23:58:42 +08:00
Rui Salvaterra
5bf7712f60 kernel: bump 5.10 to 5.10.76
Deleted (upstreamed):
bcm27xx/patches-5.10/950-0145-xhci-add-quirk-for-host-controllers-that-don-t-updat.patch [1]

Manually rebased:
bcm27xx/patches-5.10/950-0355-xhci-quirks-add-link-TRB-quirk-for-VL805.patch
bcm53xx/patches-5.10/180-usb-xhci-add-support-for-performing-fake-doorbell.patch

Note: although automatically rebaseable, the last patch has been edited to avoid
conflicting bit definitions.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-5.10.y&id=b6f32897af190d4716412e156ee0abcc16e4f1e5

Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
2021-11-01 23:54:04 +08:00
Tianling Shen
2352d1bfa9
kernel: bump to 4.9.288, 4.14.253, 4.19.214
Refreshed all patches.

Signed-off-by: Tianling Shen <cnsztl@immortalwrt.org>
2021-10-28 11:15:06 +08:00
Rui Salvaterra
646380af02 kernel: bump 5.10 to 5.10.74
Patches automatically refreshed.

Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
2021-10-22 23:58:19 +08:00
Daniel Golle
8b997cb1dd mediatek: add EEPROM data for BPi-R64 2.4GHz wmac
EEPROM data extracted from vendor image found at
http://forum.banana-pi.org/t/bpi-r64-mt7622-mac80211-wifi-driver/10246/77
http://forum.banana-pi.org/uploads/short-url/jworbyBYpvrw9VQ2sx92B9z6DWS.bin

MAC address in the EEPROM has been zero'd which results in random
address on boot.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2021-10-16 00:05:13 +08:00
Daniel Golle
5a20bc09d1 mediatek: enable configfs for DT overlay on mt7622 and mt7623
Enable kernel options to allow loading device tree overlay via configfs
at runtime. This is useful for devboards like the BPi-R2 and BPi-R64
which got RasbPi-compatible 40-pin GPIO header which allow all sorts
of extensions.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2021-10-11 23:53:08 +08:00
Tianling Shen
10a0ee06ee
kernel: bump to 4.9.285, 4.14.249, 4.19.209
Manually rebased:
- generic/pending-4.19/800-bcma-get-SoC-device-struct-copy-its-DMA-params-to-th.patch

Refreshed all patches.

Signed-off-by: Tianling Shen <cnsztl@immortalwrt.org>
2021-10-07 14:56:30 +08:00
Hauke Mehrtens
8d5315f3a2 kernel: Deactivate some ARM64 errata workarounds
This deactivates the following workarounds for erratas in ARM64 CPUS:
CONFIG_ARM64_ERRATUM_1165522: Cortex-A76 cores (r0p0, r1p0, r2p0)
CONFIG_ARM64_ERRATUM_1286807: Cortex-A76 cores (r0p0 to r3p0)
CONFIG_ARM64_ERRATUM_1418040: Cortex-A76/Neoverse-N1 cores (r0p0 to r3p1)
CONFIG_CAVIUM_TX2_ERRATUM_219: Cavium ThunderX2
CONFIG_FUJITSU_ERRATUM_010001: Fujitsu-A64FX

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
2021-10-07 00:04:20 +08:00
Rui Salvaterra
2caaeb29cc kernel: bump 5.10 to 5.10.67
Deleted (upstreamed):
bcm27xx/patches-5.10/950-0312-vc4_hdmi-Set-HD_CTL_WHOLSMP-and-HD_CTL_CHALIGN_SET.patch

Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
2021-10-05 23:55:18 +08:00
Daniel Golle
6293294f71 mediatek: remove files and patches for Linux 5.4
All subtargets only provide files and patches for Linux 5.10 by now
so there is little use for the old Linux 5.4 stuff. Remove it.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2021-10-03 23:58:27 +08:00
Daniel Golle
cdda3a1d6e mediatek: mt7623: bpi-r2: add LED aliases
Add aliases for LEDs in device tree of the BPi-R2.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2021-10-03 23:57:12 +08:00
Daniel Golle
ee56a996d1 mediatek: add FEATURES and order them alphabetically
Add common features 'gpio', 'nand', 'pci', 'pcie', 'squashfs' and 'usb'
for all mediatek targets, add 'display' and 'usbgadget' for MT7623.
Sort features alphabetically while at it.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2021-10-03 23:56:51 +08:00
Daniel Golle
0c3f870e02 mediatek: mt7622: provide power on mPCIe in SATA mode
User reported that R64 doesn't provide power to the mPCIe slot in case
the PCIe port is disabled as it is when selecting the SATA
configuration. As users may still want to use USB-connected mPCIe
modules in CN8 slot.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
2021-10-03 23:56:25 +08:00
John Audia
c37e073450 kernel: bump 5.4 to 5.4.144
Manually rebased:
  backport-5.4/370-netfilter-nf_flow_table-fix-offloaded-connection-tim.patch

All other patches automatically rebased.

Build system: x86_64
Build-tested: ipq806x/R7800
Run-tested: ipq806x/R7800

Signed-off-by: John Audia <graysky@archlinux.us>
2021-09-15 10:29:29 +08:00
AmadeusGhost
91b245d0f2 mediatek/4.19: build error fixes 2021-09-13 15:35:05 +08:00
Hauke Mehrtens
63c74899e1 kernel: Set CONFIG_RCU_CPU_STALL_TIMEOUT=21
The default value for CONFIG_RCU_CPU_STALL_TIMEOUT was changed from 60
seconds to 21 seconds in 2012 in the upstream kernel. Some targets
already use 21 seconds.

This patch changes the default value in the generic configuration to 21
seconds and removes the target specific configuration options.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Acked-by: Rui Salvaterra <rsalvaterra@gmail.com>
2021-09-10 12:26:08 +08:00
Tianling Shen
0c22299647
kernel: bump to 4.9.282, 4.14.246, 4.19.206
Resolve conflicted:
- generic/backport-4.19/370-netfilter-nf_flow_table-fix-offloaded-connection-tim.patch

Refreshed all patches.

Signed-off-by: Tianling Shen <cnsztl@immortalwrt.org>
2021-09-06 06:39:19 +08:00
Chuanhong Guo
b0fa0c9c36 mediatek: add support for TOTOLINK A8000RU
Specifications:
- SoC: MT7622
- RAM: 512MB
- Flash: MX35LF1GE4AB 128MB SPI NAND
- Ethernet: RTL8367S 5x1GbE
- WiFi: 2.4G: MT7622 5G: MT7615N x2
- Other ports: USB3.0 x1

Flash instruction:
*important*: upgrade vendor firmware to at least V7.1cu.643_B20200521
1. hold the reset button and power on the device. wait for about 10s
   before releasing the reset button.
2. upload sysupgrade.bin via u-boot recovery page on http://192.168.1.1

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
2021-09-05 23:36:08 +08:00
Rui Salvaterra
ae3d513158 kernel: move two symbols to the generic kconfigs
CONFIG_RCU_{NEED_SEGCBLIST,STALL_COMMON} are set basically everywhere. Move them
to the generic kconfigs. And resort the generic kconfigs while at it.

Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
2021-08-30 12:13:54 +08:00
Rui Salvaterra
5d84f37d0d kernel: disable CONFIG_RCU_EXPERT and friends
Based on the existing documentation [1][2], I dare anyone to demonstrate that
we need to fine-tune these RCU parameters. The (performance) breakage potential
for doing so is immense, so let's just please put down this loaded footgun.

Disable CONFIG_RCU_EXPERT and its dependent symbols. Additionally, remove the
CONFIG_RCU_EXPERT symbol from the target kconfigs which contain it.

[1] https://www.kernel.org/doc/Documentation/RCU/Design/Data-Structures/Data-Structures.html
[2] https://lwn.net/Articles/777214/

Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
2021-08-30 12:12:32 +08:00