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Q&A Does /proc/config.gz always contain all supported options of a kernel?

Assuming I have a running Linux system that has the /proc/config.gz file: Does the (unpacked) file always contain all of the options the particular kernel supports, including commented out like: ...

1 answer  ·  posted 3y ago by sktpin‭  ·  edited 1y ago by Quasímodo‭

#3: Post edited by user avatar Quasímodo‭ · 2022-10-06T10:06:02Z (over 1 year ago)
Add a kernel tag
Does /proc/config.gz always contain all supported options of a kernel?
Assuming I have a running Linux system that has the /proc/config.gz file:

Does the (unpacked) file always contain all of the options the particular kernel supports, including commented out like:

`#CONFIG_SOMETHING is not set`

or is it possible that some options which the kernel supports do not appear at all in that file?


(the usefulness of knowing that for sure is to, perhaps, be able to do some problem hunting without currently having access to the buildroot config files that were used to create the Linux image at hand)
#2: Post edited by user avatar sktpin‭ · 2021-07-30T13:04:56Z (almost 3 years ago)
  • Assuming I have a running Linux system that has the /proc/config.gz file:
  • Does the (unpacked) file always contain all of the options the particular kernel supports, including commented out like:
  • `#CONFIG_SOMETING is not set`
  • or is it possible that some options which the kernel supports do not appear at all in that file?
  • (the usefulness of knowing that for sure is to, perhaps, be able to do some problem hunting without currently having access to the buildroot config files that were used to create the Linux image at hand)
  • Assuming I have a running Linux system that has the /proc/config.gz file:
  • Does the (unpacked) file always contain all of the options the particular kernel supports, including commented out like:
  • `#CONFIG_SOMETHING is not set`
  • or is it possible that some options which the kernel supports do not appear at all in that file?
  • (the usefulness of knowing that for sure is to, perhaps, be able to do some problem hunting without currently having access to the buildroot config files that were used to create the Linux image at hand)
#1: Initial revision by user avatar sktpin‭ · 2021-07-30T13:04:39Z (almost 3 years ago)
Does /proc/config.gz always contain all supported options of a kernel?
Assuming I have a running Linux system that has the /proc/config.gz file:

Does the (unpacked) file always contain all of the options the particular kernel supports, including commented out like:

`#CONFIG_SOMETING is not set`

or is it possible that some options which the kernel supports do not appear at all in that file?


(the usefulness of knowing that for sure is to, perhaps, be able to do some problem hunting without currently having access to the buildroot config files that were used to create the Linux image at hand)