[Bug testsuite/27791] New: hw_breakpoint.exp fails to build

[scox at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27791

            Bug ID: 27791
           Summary: hw_breakpoint.exp fails to build
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: testsuite
          Assignee: systemtap at sourceware dot org
          Reporter: scox at redhat dot com
  Target Milestone: ---

Running /home/scox/systemtap/src/testsuite/systemtap.base/hw_breakpoint.exp ...
make[3]: Entering directory '/tmp/staptestyIP3jy'
make -C /lib/modules/5.12.0-0.rc8.193.el9.x86_64/build
SUBDIRS=/tmp/staptestyIP3jy KBUILD_EXTMOD=/tmp/staptestyIP3jy modules
make[4]: Entering directory '/usr/src/kernels/5.12.0-0.rc8.193.el9.x86_64'
  CC [M]  /tmp/staptestyIP3jy/stap_hwbkpt_kmod.o
make[4]: Leaving directory '/usr/src/kernels/5.12.0-0.rc8.193.el9.x86_64'
make[3]: Leaving directory '/tmp/staptestyIP3jy'
/tmp/staptestyIP3jy/stap_hwbkpt_kmod.c: In function 'init_module':
/tmp/staptestyIP3jy/stap_hwbkpt_kmod.c:82:54: error: passing argument 4 of
'proc_create' from incompatible pointer type
[-Werror=incompatible-pointer-types]|         stm_ctl = proc_create (CMD_FILE,
0666, NULL, &stm_fops_cmd);
      |                                                      ^~~~~~~~~~~~~
      |                                                      |
      |                                                      struct
file_operations *
In file included from /tmp/staptestyIP3jy/stap_hwbkpt_kmod.c:13:
./include/linux/proc_fs.h:109:122: note: expected 'const struct proc_ops *' but
argument is of type 'struct file_operations *'
  109 | struct proc_dir_entry *proc_create(const char *name, umode_t mode,
struct proc_dir_entry *parent, const struct proc_ops *proc_ops);
      |                                                                        
                          ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
cc1: some warnings being treated as errors
make[5]: *** [scripts/Makefile.build:271:
/tmp/staptestyIP3jy/stap_hwbkpt_kmod.o] Error 1
make[4]: *** [Makefile:1862: /tmp/staptestyIP3jy] Error 2
make[3]: *** [Makefile:5: default] Error 2
BUILD FAILED

It needs a bit of porting and/or systemtap runtime autoconfing (which it's not
really setup uto do)
testsuite/systemtap.base/stap_hwbkpt_kmod.c
A stap module should provide this service to the other test case rather than
hand-written c module.  See also STAPCONF_PROC_OPS over in
runtime/transport/procfs.c

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