anyone using git kernel?

mrapathy · 08-04-2022, 04:05 PM

Using Slackware 15 and Debian 11.3 non free
I have a piece of hardware supported by 5.4.x longterm but 5.10,5.15,5.18 it wont work. just looking at code in 5.4 to 5.6 is when the code for drv.c in iwlwifi changes to new style and my hardware hates it wont work. Oddly I have a example of same hardware working in different situation.

something bout code 5.4.x longterm and 5.6 got my hardware working to a degree 5.7 till current doesnt do. it should I see code for the device intel AX200.

tried using git clone kernel for git bisect.
could only build one kernel that was 5.4.197. all other kernels I have tried failed to build or build modules. I have no problems with building kernels and modules outside of using git for kernel.

git checkout kernelversion to change my version.

git bisect wants a merged code or kernel I doubt I could provide that as kernel is 2 years old.

drumz · 08-04-2022, 04:31 PM

If you want to guarantee to create a "clean" source archive here is an example of creating a new folder containing the source. This example is for v4.14. I think you can replace the tag "v4.14" with "HEAD" in your case:

Code:

git archive --format=tar --prefix=linux-4.14/ v4.14 | (cd /usr/src/git && tar xf -)

Then after you have an existing clean source directory it's much faster to patch it:

Code:

echo "Creating new source directory..."
cp -al linux-$OLD_VER linux-$NEW_VER
cd linux-git || exit
echo "Patching source directory..."
git diff v$OLD_VER v$NEW_VER | (cd ../linux-$NEW_VER && git apply -)
cd ..

Also you can keep a clean source archive (your git tree) by using a separate build directory. Doing it this way you shouldn't have a problem directly building from the git source tree (or also combine with the above):

Code:

make O=$OUTDIR oldconfig
make O=$OUTDIR

You can do all this while you're in the middle of a git bisect.

mrapathy · 08-05-2022, 09:12 PM

How would I clone specific kernel I want to work with off the bat instead of cloning master or mainline first?

for example I want 5.6.x kernel cloned first then want to git checkout to 5.7.x and onward

henca · 08-06-2022, 04:19 AM

Quote:

Originally Posted by mrapathy

How would I clone specific kernel I want to work with off the bat instead of cloning master or mainline first?

for example I want 5.6.x kernel cloned first then want to git checkout to 5.7.x and onward

By default "git clone" will clone an entire repo with all its branches and history and the clone will initially be placed on top of master.

To be placed on a specific branch or tag instead of top of master you can specify that with the --branch parameter.
Also, if you don't want to clone all history you can use the parameter "--depth 1".

Example:

Code:

git clone --branch v5.19 --depth 1 https://github.com/torvalds/linux.git

The above will give you a clone of version 5.19 of the kernel without any history or any possibility to move around among branches or old commits.

regards Henrik