[kylee0215]

What this does

Adds one rule to generalize_make_log() in run_test.sh to drop the warning: pahole version differs from the one used to build the kernel line from make.log before comparison.

Why

Since Linux v7.0, the kernel's top-level Makefile prints this warning for external module builds when the pahole version in the environment differs from the one the kernel was built with:

warning: pahole version differs from the one used to build the kernel
  The kernel was built with: 131
  You are using:             0

#609 (for #608) filtered the The kernel was built with: line, and the You are using: line is already covered by the compiler warning rule, but the first line is still left in the log. On testbeds without pahole (or with a different version), run_test.sh still fails:

 Building module(s)
 # command: make -j1 KERNELRELEASE=7.0.0-38-generic -C /lib/modules/7.0.0-38-generic/build M=/var/lib/dkms/dkms_test/1.0/build
+warning: pahole version differs from the one used to build the kernel
   CC      dkms_test.o
   CC      dkms_test.mod.o
   LD      dkms_test.ko
Error: unexpected make.log difference

This is hit by Ubuntu test with 7.0 kernels.

How

 /warning: the compiler differs from the one used to build the kernel/d
 /  The kernel was built by:/d
 /  You are using:/d
+/warning: pahole version differs from the one used to build the kernel/d
 /  The kernel was built with:/d

This mirrors the existing handling of the compiler version warning, where the header line and both detail lines are all filtered.

[scaronni]

This was happening on Fedora as well, but the issue was the updates in the repositories not exactly aligned; so the fix should be there. I will merge it anyway after the tests pass as it's useful to have. Thanks.