Category Archives: kernel

Kernel – GCC 8 Tests – Not Quite Ready…

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I decided to try updating a crash-and-burn test system to Fedora 28 (early-beta..) as this included GCC 8 (currently 8.0.1), to see how well the Kernel (4.16-rc6) compiled.. There were a lot of warnings generated: …………………… CC [M] drivers/rtc/rtc-pcf8523.o CC drivers/usb/core/file.o CC drivers/video/hdmi.o CC [M] drivers/rtc/rtc-pcf8563.o drivers/video/hdmi.c: In function ‘hdmi_spd_infoframe_init’: drivers/video/hdmi.c:171:2: warning: ‘strncpy’ specified bound 8 equals … Continue reading →

Kernel – GCC 8 Tests – Not Quite Ready…

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I decided to try updating a crash-and-burn test system to Fedora 28 (early-beta..) as this included GCC 8 (currently 8.0.1), to see how well the Kernel (4.16-rc6) compiled.. There were a lot of warnings generated: …………………… CC [M] drivers/rtc/rtc-pcf8523.o CC drivers/usb/core/file.o CC drivers/video/hdmi.o CC [M] drivers/rtc/rtc-pcf8563.o drivers/video/hdmi.c: In function ‘hdmi_spd_infoframe_init’: drivers/video/hdmi.c:171:2: warning: ‘strncpy’ specified bound 8 equals … Continue reading →

NVIDIA – New Driver – Still Broken With 4.16..

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NVIDIA have released a new driver – 390.42 – and brief details are here:  http://www.nvidia.com/Download/driverResults.aspx/131853/en-us This still fails with Kernel 4.16 (tested with 4.16-rc5): ………………… ld -r -o /home/rgadsdon/kernel/NVIDIA-Linux-x86_64-390.42/kernel/nvidia-modeset/nv-modeset-interface.o /home/rgadsdon/kernel/NVIDIA-Linux-x86_64-390.42/kernel/nvidia-modeset/nvidia-modeset-linux.o Building modules, stage 2. MODPOST 4 modules WARNING: “swiotlb_map_sg_attrs” [/home/rgadsdon/kernel/NVIDIA-Linux-x86_64-390.42/kernel/nvidia.ko] undefined! I have had various VMware problems with the 390.xx series of drivers, and so will be … Continue reading →

NVIDIA – Possible Fix for Kernel 4.16..

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Thanks to the efforts of mlau on the NVIDIA Devtalk Forum, there is a possible fix for the swiotlb issue with Kernel 4.16..     See https://devtalk.nvidia.com/default/topic/1030082/linux/kernel-4-16-rc1-breaks-latest-drivers-unknown-symbol-swiotlb_map_sg_attrs-/ for details.. For NVIDIA driver 384.111, I had to increment all the nv–linux.h patch line number references by 100 (so ‘…@@ –1209,6 +1209,7 @@… becomes …@@ –1309,6 +1309,7 @@..’ and ‘..@@ -1251,7 … Continue reading →

NVIDIA – Kernel 4.16 Issues – Update..

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An update on the ”Unknown symbol swiotlb_map_sg_attrs” issue with Kernel 4.16-rc and the latest NVIDIA drivers (384.111 and 390.25).. From more testing done after I posted brief details on the NVIDIA Forum, it would appear that – as is sometimes the case – this one issue may have been masking further problems..   See https://devtalk.nvidia.com/default/topic/1030082/linux/kernel-4-16-rc1-breaks-latest-drivers-unknown-symbol-swiotlb_map_sg_attrs-/ for more info.. … Continue reading →

IA64 – Updated to 4.16-rc3..

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Just updated the HP RX2600 to Kernel 4.16-rc3, and apart from an odd quirk at compile time, all went OK.. ………….. Building modules, stage 2. MODPOST 98 modules GZIP arch/ia64/hp/sim/boot/vmlinux.gz File “./arch/ia64/scripts/unwcheck.py”, line 19 print “Usage: %s FILE” % sys.argv[0] ^ SyntaxError: Missing parentheses in call to ‘print’ make: [arch/ia64/Makefile:78: unwcheck] Error 1 (ignored) ……………… Despite this, … Continue reading →

Kernel – 4.16-rc3 Released, and Still no NVIDIA Fix?

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Kernel 4.16-rc3 is out, and brief details of post-rc2 changes are here:  http://lkml.iu.edu/hypermail/linux/kernel/1802.3/00500.html I still cannot find any solution proposed for the ‘Unknown symbol swiotlb_map_sg_attrs‘ error with the latest NVIDIA drivers, despite posting brief details on the Developers Forum over a week ago.. Robert Gadsdon.   February 26, 2018.

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Kernel – 4.16-rc1 – OK with VMware 14.1.1, Breaks NVIDIA?..

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Kernel 4.16-rc1 is out, and brief details are here:  http://lkml.iu.edu/hypermail/linux/kernel/1802.1/02325.html VMware 14.1.1 is OK, and NVIDIA 384.111 and 390.25 both compile OK, but then fail to load/run: ………… modprobe: ERROR: could not insert ‘nvidia’: Unknown symbol in module, or unknown parameter (see dmesg) dmesg: [ 2142.352238] nvidia: Unknown symbol swiotlb_map_sg_attrs (err 0) Comparing kernel 4.15.x compiled source … Continue reading →

Kernel – GCC and ‘Retpoline’..

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The recent summary of Kernel 4.15 mentioned the test for ‘compliant’ versions of GCC which fully support the retpoline mitigation, but only gave an example of non-compliance: With GCC 7.2: ~]$ cat /sys/devices/system/cpu/vulnerabilities/spectre_v2  Vulnerable: Minimal generic ASM retpoline I re-created Fedora (Rawhide) GCC 7.3.1 for Fedora 27, and it gives the following, after Kernel 4.15 compilation/boot: ~]$ … Continue reading →

Kernel – 4.15 Final, at Last..

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Kernel 4.15 is – finally – released, and an overview of changes since -rc9 is here:  http://lkml.iu.edu/hypermail/linux/kernel/1801.3/02794.html The latest NVIDIA drivers – 384.111 and 390.12 – compile and load OK, and VMware 14.1.1 is also OK. It is worth mentioning that , although the final release was delayed due to more work on PTI mitigation etc,  this … Continue reading →