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configs/visionfive2_defconfig: bump Linux to 6.18.55

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When running iperf3 with Linux 6.18.51 on VisionFive 2, one CPU core
stays at 100% load during the test, while network throughput is limited
to approximately 793 Mbits/sec:

[ ID] Interval           Transfer     Bitrate
[  5]   0.00-10.01  sec   945 MBytes   793 Mbits/sec                  receiver

The regression was introduced in Linux 6.14 by commit df542f669307
("net: stmmac: Switch to zero-copy in non-XDP RX path"). It leads to
misaligned access exceptions when parsing packet headers. During the
iperf3 test, perf stat reported approximately 9.6 million alignment
faults over 5 seconds:

$ perf stat -a -e alignment-faults -- sleep 5

 Performance counter stats for 'system wide':

           9620073      alignment-faults

       5.029337000 seconds time elapsed

The kernel must emulate these unaligned accesses, resulting in
significant overhead.

The issue was fixed in Linux 6.18.52 [1]. Bump Linux to 6.18.55, the
latest stable release at the time of writing, to include the fix.

[1] https://lore.kernel.org/all/2026091704-CVE-2026-90059-36e6@gregkh

Fixes: 98aa14a186 ("configs/visionfive2: bump Linux to 6.18.51, U-Boot to 2026.07, and OpenSBI to 1.8.1")
Assisted-by: LLM
Signed-off-by: Fengwei Tan <tfx2001@outlook.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Fengwei Tan
2026-10-11 00:31:48 +08:00
committed by Thomas Petazzoni
parent a9d690cc5d
commit 98ba8f3951
2 changed files with 2 additions and 2 deletions
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2
board/visionfive2/patches/linux/linux.hash
View File

@@ -1,2 +1,2 @@
# Locally calculated
sha256 ba2f60f858bf4d1f929101faa356c93dc8b925b17aaa9f95eabd4627758df613 linux-6.18.51.tar.xz
sha256 f410638061a165c12f42ab871d2f3fcd525515359b5faeee80969cff84524df9 linux-6.18.55.tar.xz

2
configs/visionfive2_defconfig
View File

@@ -7,7 +7,7 @@ BR2_ROOTFS_OVERLAY="board/visionfive2/overlay"
BR2_ROOTFS_POST_IMAGE_SCRIPT="board/visionfive2/post-image.sh"
BR2_LINUX_KERNEL=y
BR2_LINUX_KERNEL_CUSTOM_VERSION=y
BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.18.51"
BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.18.55"
BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/visionfive2/linux_defconfig"
BR2_LINUX_KERNEL_DTS_SUPPORT=y