Don't add "+" to linux kernel version

Question

I am building linux kernel, if my kernel under git, then kernel version every time is:

Image Name:   Linux-2.6.39+ 

If I am not using git, then everything is OK without any plus at the end.

I know that this done by scripts/setlocalversion script:

if test "$CONFIG_LOCALVERSION_AUTO" = "y"; then     # full scm version string     res="$res$(scm_version)" else     # append a plus sign if the repository is not in a clean     # annotated or signed tagged state (as git describe only     # looks at signed or annotated tags - git tag -a/-s) and     # LOCALVERSION= is not specified     if test "${LOCALVERSION+set}" != "set"; then         scm=$(scm_version --short)             res="$res${scm:++}"         fi fi 

So, it is possible without code changes say to build system that no need to add "+" at the end of version line?

Answer 1

The plus sign at the end of your version string is there as an indicator that the kernel was built from modified sources (that is, there were non-committed changes). This is also indicated by the comments in scripts/setlocalversion.

To avoid the '+' being appended despite having a dirty working directory, simply set LOCALVERSION explicityly when running make:

make LOCALVERSION= 

You may also have to change the configuration option CONFIG_LOCALVERSION_AUTO to n in your kernel config (.config) before building:

sed -i "s|CONFIG_LOCALVERSION_AUTO=.*|CONFIG_LOCALVERSION_AUTO=n|" .config 

Answer 2

To prevent the script scripts/setlocalversion to append the + to the end of the kernel local version, create an empty .scmversion file in the root of the kernel sources.

touch .scmversion 

this way, you'll be able to leave LOCALVERSION as is in the kernel configuration file, in case you want to append a local signature to the kernel name.