[Bug runtime/17696] New: Systemtap fails to find kernel tracepoints when kernel is built in a separate directory from source tree

["zhuo at bitoasis dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17696

            Bug ID: 17696
           Summary: Systemtap fails to find kernel tracepoints when kernel
                    is built in a separate directory from source tree
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: zhuo at bitoasis dot com

* A:

When kernel is built in a separate directory from the kernel source tree:

1) before building:

export BUILDDIR=/a/separate/path/
export KBUILD_OUTPUT=${BUILDDIR}/build

2) after building and installing:

   /lib/modules/`uname -r`/build links to /a/separate/path/
   /lib/modules/`uname -r`/source links to /kernel/source/tree/

Under this situation, stap -L 'kernel.trace("*")' lists nothing.

* B:

When kernel is built directly in kernel source tree directory,

   /lib/modules/`uname -r`/build links to /kernel/source/tree/
   /lib/modules/`uname -r`/source links to /kernel/source/tree/

Under this situation, stap -L 'kernel.trace("*")' lists all available
tracepoints.

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