Re: [gentoo-user] kernel config strangeness
> > > # CONFIG_EDAC_AMD64_ERROR_INJECTION is not set > > Are you sure those settings are "=y" or "=m") in the other file, and not > just simply not present? Changing that one setting may only have altered > whether those other settings are explicitly included in the .config file, > and not their value. > On the .config that has had CONFIG_CPU_SUP_AMD removed, these settings are no longer present. My current understanding is that if a particular CONFIG_ option is not present in the .config file, it will not be built due to a missing prerequisite. Do you have a different understanding?
Re: [gentoo-user] kernel config strangeness
On 8/2/19 8:52 PM, Adam Carter wrote: First, I finally figured out this is not really important for me. "Supported Processor types" is ONLY for 32 bits. When i remove Processor type and features ---> [*] Supported processor vendors ---> [ ] Support AMD processors (CONFIG_CPU_SUP_AMD) it removes features relevant to 64 bit CPUs; # diff .config .config-gold | grep ^\> > CONFIG_X86_CPU_RESCTRL=y > CONFIG_CPU_SUP_AMD=y > # CONFIG_GART_IOMMU is not set > CONFIG_X86_MCE_AMD=y > CONFIG_X86_MCE_THRESHOLD=y > CONFIG_PERF_EVENTS_AMD_POWER=y > CONFIG_MICROCODE=y > # CONFIG_MICROCODE_INTEL is not set > CONFIG_MICROCODE_AMD=y > CONFIG_MICROCODE_OLD_INTERFACE=y > # CONFIG_AMD_MEM_ENCRYPT is not set > CONFIG_X86_ACPI_CPUFREQ_CPB=y > CONFIG_X86_AMD_FREQ_SENSITIVITY=y > CONFIG_AMD_NB=y > CONFIG_SENSORS_K10TEMP=m > CONFIG_SENSORS_FAM15H_POWER=m > CONFIG_AGP_AMD64=y > CONFIG_EDAC_DECODE_MCE=y > CONFIG_EDAC_AMD64=m > # CONFIG_EDAC_AMD64_ERROR_INJECTION is not set Are you sure those settings are "=y" or "=m") in the other file, and not just simply not present? Changing that one setting may only have altered whether those other settings are explicitly included in the .config file, and not their value. Jack
Re: [gentoo-user] kernel config strangeness
> > First, I finally figured out this is not really important for me. > "Supported Processor types" is ONLY for 32 bits. > When i remove Processor type and features ---> [*] Supported processor vendors ---> [ ] Support AMD processors (CONFIG_CPU_SUP_AMD) it removes features relevant to 64 bit CPUs; # diff .config .config-gold | grep ^\> > CONFIG_X86_CPU_RESCTRL=y > CONFIG_CPU_SUP_AMD=y > # CONFIG_GART_IOMMU is not set > CONFIG_X86_MCE_AMD=y > CONFIG_X86_MCE_THRESHOLD=y > CONFIG_PERF_EVENTS_AMD_POWER=y > CONFIG_MICROCODE=y > # CONFIG_MICROCODE_INTEL is not set > CONFIG_MICROCODE_AMD=y > CONFIG_MICROCODE_OLD_INTERFACE=y > # CONFIG_AMD_MEM_ENCRYPT is not set > CONFIG_X86_ACPI_CPUFREQ_CPB=y > CONFIG_X86_AMD_FREQ_SENSITIVITY=y > CONFIG_AMD_NB=y > CONFIG_SENSORS_K10TEMP=m > CONFIG_SENSORS_FAM15H_POWER=m > CONFIG_AGP_AMD64=y > CONFIG_EDAC_DECODE_MCE=y > CONFIG_EDAC_AMD64=m > # CONFIG_EDAC_AMD64_ERROR_INJECTION is not set
Re: [gentoo-user] kernel config strangeness
On 2019.08.01 22:05, Adam Carter wrote: However, if I start with the .config which workd, and "make xconfig" and select "Supported processor types" under "Processor type and features" and then unselect "Support Intel Pprocessors" (I have a Ryzen) and save the config, it decreases the size of .config from 169K to under 13K, losing almost every setting in the file. Checking my systems, .config is 131k (AMD system, so CONFIG_CPU_SUP_INTEL is not set) and an Intel system is 116k. Try following the same procedure using make menuconfig instead of make xconfig and see what happens. First, I finally figured out this is not really important for me. "Supported Processor types" is ONLY for 32 bits. One or more of those need to be set ONLY if the kernel needs to run on a 32 bit system. That is why it would be set for any live image which will run on 32 bits, but would all be off for any distro that no longer supports 32 bits. Using menuconfig does not truncate .config. However, my current guess is that some combination of settings where "Supported processor types" (CONFIG_PROCESSOR_SELECT) IS selected and perhaps one of it's sub settings (CONFIG_CPU XXX) is NOT selected causes make xconfig or gconfig to completely reset the configuration, reducing the next saved version to under 10k. I found a (not much used) linux-config mailing list, and I'll probably post the issue there. Jack
Re: [gentoo-user] kernel config strangeness
> However, if I start with the .config which workd, and "make xconfig" > and select "Supported processor types" under "Processor type and > features" and then unselect "Support Intel Pprocessors" (I have a > Ryzen) and save the config, it decreases the size of .config from 169K > to under 13K, losing almost every setting in the file. > Checking my systems, .config is 131k (AMD system, so CONFIG_CPU_SUP_INTEL is not set) and an Intel system is 116k. Try following the same procedure using make menuconfig instead of make xconfig and see what happens.
Re: [gentoo-user] kernel config strangeness
On Wednesday, 31 July 2019 23:31:20 BST Jack wrote: > I just built a new PC, and I'm having a problem getting it to boot with > a custom configured kernel (gentoo-sources-5.2.4.) If I start with a > blank config and work through "make xconfig" the resulting kernel and > initramfs (genkernel) doesn't boot (just hangs after loading > initramfs.) Does it spit out any errors on the console? > So, starting with the config from the running kernel from > the live install medium, running make oldconfig then genkernel, it > boots fine. I assume my problem is removing something important while > trying to remove all the unnecessary options for supporting hardware > I'll never use. > > However, if I start with the .config which workd, and "make xconfig" > and select "Supported processor types" under "Processor type and > features" and then unselect "Support Intel Pprocessors" (I have a > Ryzen) and save the config, it decreases the size of .config from 169K > to under 13K, losing almost every setting in the file. Hmm ... this sound too light for a desktop kernel. I have done the same, stripping out anything not relevant or wanted on my laptop's AMD kernel and this is what I get: $ ls -la /usr/src/linux/.config -rw-r--r-- 1 root root 106014 Jul 31 17:13 /usr/src/linux/.config However, I use menuconfig almost exclusively, but this should not make any difference. Did you diff the old and new .config files? [1] > Even stranger, if I look at "Local version - append to kernel release:" > it still shows the value I had previously set - but that setting > CONFIG_LOCALVERSION is NOT in .config. If I close the tool and start > it again, that setting is now missing and it looks like all settings > have been reset to the clean starting defaults (i.e., many say "(NEW)" > > Am I missing something here, or might this really be a bug in "make > xconfig" ? Have you checked the /usr/src/linux symlink is pointing to the correct kernel sources directory? What you describing is akin to you working on the wrong .config file. > Can anyone else replicate this? While I don't think it's related to my > problem getting a non-booting kernel, it certainly has me confused. > > Thanks for helping me confirm what's left of my sanity. > > Jack I don't have time to replicate it this morning, but in case you're missing some simple step in your procedure, try this: cd /usr/src ls -la check the linux symlink is pointing to the desired kernel sources directory. If not remove it and re-set it either manually, or by using 'eselect kernel'. Then copy the running config to the symlinked linux directory, overwriting the sources' config file with its default settings. zcat /proc/config.gz > /usr/src/linux/.config Now you can go into the linux directory and modify its config: cd linux make xconfig When you're done tweaking things make sure you save your changes before you make clean && make && make modules_install && make install The last bit copies over the kernel for you to /boot if you don't want to do this manually or use your own naming convention. For more details have a look here: https://wiki.gentoo.org/wiki/Kernel/Configuration HTH. -- Regards, Mick signature.asc Description: This is a digitally signed message part.
[gentoo-user] kernel config strangeness
I just built a new PC, and I'm having a problem getting it to boot with a custom configured kernel (gentoo-sources-5.2.4.) If I start with a blank config and work through "make xconfig" the resulting kernel and initramfs (genkernel) doesn't boot (just hangs after loading initramfs.) So, starting with the config from the running kernel from the live install medium, running make oldconfig then genkernel, it boots fine. I assume my problem is removing something important while trying to remove all the unnecessary options for supporting hardware I'll never use. However, if I start with the .config which workd, and "make xconfig" and select "Supported processor types" under "Processor type and features" and then unselect "Support Intel Pprocessors" (I have a Ryzen) and save the config, it decreases the size of .config from 169K to under 13K, losing almost every setting in the file. Even stranger, if I look at "Local version - append to kernel release:" it still shows the value I had previously set - but that setting CONFIG_LOCALVERSION is NOT in .config. If I close the tool and start it again, that setting is now missing and it looks like all settings have been reset to the clean starting defaults (i.e., many say "(NEW)" Am I missing something here, or might this really be a bug in "make xconfig" ? Can anyone else replicate this? While I don't think it's related to my problem getting a non-booting kernel, it certainly has me confused. Thanks for helping me confirm what's left of my sanity. Jack
