[LU-18338] checking for Ubuntu kernel signature failed with kernel 6.11

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.17.0
• Affects Version/s: Lustre 2.16.0
• Severity: 3
• Assignee: Jian Yu
• Reporter: Jian Yu

Description

While building Lustre with kernel 6.11.0-061100-generic on Ubuntu 24.04, configure log showed that:

checking for Linux kernel utsrelease... 6.11.0-061100-generic
checking for RedHat kernel release number...
checking if Linux kernel was built with CONFIG_SUSE_KERNEL... no
checking for Ubuntu kernel signature... no
checking for Debian kernel signature... grep: /usr/src/linux-headers-6.11.0-061100-generic/include/generated/package.h: No such file or directory
no
checking for ELRepo -ml kernel signature on CentOS... no
checking for openEuler kernel version number...
configure: WARNING: Kernel Distro seems to be neither RedHat, SuSE, openEuler, Ubuntu nor Debian
checking for Linux kernel module package directory... configure: WARNING: Kernel Distro seems to be neither RedHat, SuSE, openEuler, Ubuntu nor Debian

And in config/lustre-build-linux.m4:

        # Check for Ubuntu
        AS_IF([test "x$KERNEL_FOUND" = "xno"], [
                AC_CACHE_CHECK([for Ubuntu kernel signature], lb_cv_ubuntu_kernel_sig, [
                        lb_cv_ubuntu_kernel_sig="no"
                        AS_IF([fgrep -q "CONFIG_VERSION_SIGNATURE \"Ubuntu" $LINUX_OBJ/include/generated/autoconf.h], [
                                lb_cv_ubuntu_kernel_sig="yes"
                        ])
                ])
                AS_IF([test "x$lb_cv_ubuntu_kernel_sig" = "xyes"], [
                        UBUNTU_KERNEL="yes"
                        KERNEL_FOUND="yes"
                ])
        ])

It turned out CONFIG_VERSION_SIGNATURE was not defined in autoconf.h:

# grep CONFIG_VERSION_SIGNATURE /usr/src/linux-headers-6.11.0-061100-generic/include/generated/autoconf.h

Kernel should be detected with UTS_RELEASE:

$ grep -rn RELEASE /usr/src/linux-headers-6.11.0-061100-generic/include/
/usr/src/linux-headers-6.11.0-061100-generic/include/generated/utsrelease.h:1:#define UTS_RELEASE "6.11.0-061100-generic"
/usr/src/linux-headers-6.11.0-061100-generic/include/generated/utsrelease.h:2:#define UTS_UBUNTU_RELEASE_ABI 061100