[Bug testsuite/4254] New: testsuite/buildok/twenty.stp needs change for 2.6.21-rc1 and above kernel.

["srinivasa at in dot ibm dot com" <sourceware-bugzilla at sourceware dot org>]

Since there has been change in the kernel, testsuite/buildok/twent.stp doesn't
work and hence fails.
We need to change this testcase to make it work.

Earlier testcase looks like this.
===================================================
#! stap -gp4

# Test for writing to target variables, PR 1131

probe kernel.function("vfs_readdir")
{
        $file->f_dentry->d_name->len = 1
}
=============================================
Which has to be changed to this 
========================================
#! stap -gp4

# Test for writing to target variables, PR 1131

probe kernel.function("vfs_readdir")
{
        $file->f_path->dentry->d_name->len = 1;
}
=================================================

Due to this change in include/linux/file.h
===================================
struct file {
        /*
         * fu_list becomes invalid after file_free is called and queued via
         * fu_rcuhead for RCU freeing
         */
        union {
                struct list_head        fu_list;
                struct rcu_head         fu_rcuhead;
        } f_u;
        struct path             f_path; ====> change
#define f_dentry        f_path.dentry
#define f_vfsmnt        f_path.mnt
        const struct file_operations    *f_op;
        atomic_t                f_count;
        unsigned int            f_flags;
        mode_t                  f_mode;
        loff_t                  f_pos;
=============================================

Please let me know your comments on this.

-- 
           Summary: testsuite/buildok/twenty.stp needs change for 2.6.21-rc1
                    and above  kernel.
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: testsuite
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: srinivasa at in dot ibm dot com
                CC: ananth at in dot ibm dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=4254

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