Linux 4.19.7 Released With Important PCI Express Fix, New & Improved STIBP
Written by Michael Larabel in Linux Kernel on 5 December 2018 at 03:11 PM EST. 11 Comments
LINUX KERNEL --
Greg Kroah-Hartman has released Linux 4.19.7 today as another rather eventful point release in the Linux 4.19 stable series. He's also updated the older LTS branches too should you be depending upon them.

Linux 4.19.7 is notable in that it back-ported the new STIBP code for offering better behavior around the cross-HT Spectre V2 mitigation in that it only applies to opt-in processes via prctl and SECCOMP by default rather than all processes, so the system performance isn't clobbered. This is the code merged last weekend to Linux 4.20 Git and so now everything is back to smooth sailing with upstream Linux performance.

The other notable change to Linux 4.19.7 is a PCI Express code fix that was causing issues up to now for those using PCI Express 3.0 graphics cards on older motherboards supporting PCIe 1.0/2.0. This was causing issues in particular for Radeon GPUs although the bug and resulting fix are in the kernel's common PCIe code.

Not yet in the stable kernel is any fix to the "EXT4 corruption issue" introduced in Linux 4.19. But as covered yesterday, that's looking to be a BLK-MQ regression. If that all pans out, hopefully for Linux 4.19.8 in a few days it will be safe from the data corruption problem.

Besides Linux 4.19.7 there is also 4.14.86 and 4.9.143 for rounding out today's stable activity.

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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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