Description of problem:

After installing a kernel module packaged in an RPM with KMP support (kmod-... rpm file that was built against default kernel version 3.10.0-327.el7.ppc64le) on RHEL 7.2 PPC64LE with errata kernel version 3.10.0-327.10.1.el7.ppc64le, the compatibility symlinks for the modules were not created under /lib/modules/3.10.0-327.10.1.el7.ppc64le/weak-updates/.

The problem is with a regular expression in script "/sbin/weak-modules" in function module_is_compatible, which fails to get the "TOC." symbol from kernel's symvers, which causes a false alarm like:
    "Module ib_core.ko from kernel 3.10.0-327.el7.ppc64le is not compatible   with kernel 3.10.0-327.10.1.el7.ppc64le in symbols: TOC."
Therefore, the symlink is not created under weak-updates/ directory.

* Note that manually insmod-ing the module worked, which indicated that there is no ABI compatibility issue.


More details:
At line #201: | sed -r -ne 's:^(0x[0]*[0-9a-f]{8}\t[0-9a-zA-Z_]+)\t.*:\1:p'
The symbol "TOC." is excluded as "\." is not in the regular expression for a valid symbol name.
But, when getting modversios for each module using modprobe, all symbols are taken including those with "." in their names, and as a result, the script thinks that the module needs a symbol that is not provided by anyone.

I verified that "TOC." exists in /boot/symvers-$krel.gz with same version as in my module (both are 0x00000000      TOC.).

The "TOC." symbol seems to exist only on PPC64LE, therefore the issue exist only on PPC64LE.


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Version-Release number of selected component (if applicable):
/sbin/weak-modules from kmod-20-5.el7.ppc64le
Red Hat Enterprise Linux Server release 7.2 (Maipo)


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How reproducible:
Always.

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Steps to Reproduce:
1. Build kernel module packaged in an RPM with KMP support on 3.10.0-327.el7.ppc64le
2. Install it on errata kernel 3.10.0-327.10.1.el7.ppc64le

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Actual results:
Compatibility symlinks for compatible modules are not created. Nothing under /lib/modules/3.10.0-327.10.1.el7.ppc64le/weak-updates/

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Expected results:
Links for installed module should exist under /lib/modules/3.10.0-327.10.1.el7.ppc64le/weak-updates/