Hi Al,

After merging the vfs tree, today's linux-next build (powercp
allyesconfig) failed like this (I have also included all the warnings):

samples/statx/test-fsinfo.c: In function 'fsinfo':
samples/statx/test-fsinfo.c:36:17: error: '__NR_fsinfo' undeclared (first use in this function); did you mean '__NR_sysinfo'?
  return syscall(__NR_fsinfo, dfd, filename, params, buffer, buf_size);
                 ^~~~~~~~~~~
                 __NR_sysinfo
samples/statx/test-fsinfo.c:36:17: note: each undeclared identifier is reported only once for each function it appears in
samples/statx/test-fsinfo.c: In function 'dump_attr_LIMITS':
samples/statx/test-fsinfo.c:181:30: warning: format '%llx' expects argument of type 'long long unsigned int', but argument 2 has type '__u64 {aka long unsigned int}' [-Wformat=]
  printf("\tmax file size: %llx\n", f->max_file_size);
                           ~~~^     ~~~~~~~~~~~~~~~~
                           %lx
samples/statx/test-fsinfo.c:182:32: warning: format '%llx' expects argument of type 'long long unsigned int', but argument 2 has type '__u64 {aka long unsigned int}' [-Wformat=]
  printf("\tmax ids      : u=%llx g=%llx p=%llx\n",
                             ~~~^
                             %lx
         f->max_uid, f->max_gid, f->max_projid);
         ~~~~~~~~~~              
samples/statx/test-fsinfo.c:182:39: warning: format '%llx' expects argument of type 'long long unsigned int', but argument 3 has type '__u64 {aka long unsigned int}' [-Wformat=]
  printf("\tmax ids      : u=%llx g=%llx p=%llx\n",
                                    ~~~^
                                    %lx
         f->max_uid, f->max_gid, f->max_projid);
                     ~~~~~~~~~~         
samples/statx/test-fsinfo.c:182:46: warning: format '%llx' expects argument of type 'long long unsigned int', but argument 4 has type '__u64 {aka long unsigned int}' [-Wformat=]
  printf("\tmax ids      : u=%llx g=%llx p=%llx\n",
                                           ~~~^
                                           %lx
         f->max_uid, f->max_gid, f->max_projid);
                                 ~~~~~~~~~~~~~ 
samples/statx/test-fsinfo.c: In function 'dump_attr_SUPPORTS':
samples/statx/test-fsinfo.c:198:24: warning: format '%llx' expects argument of type 'long long unsigned int', but argument 2 has type '__u64 {aka long unsigned int}' [-Wformat=]
  printf("\tstx_attr=%llx\n", f->stx_attributes);
                     ~~~^     ~~~~~~~~~~~~~~~~~
                     %lx
samples/statx/test-fsinfo.c: In function 'fsinfo':
samples/statx/test-fsinfo.c:37:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
scripts/Makefile.host:90: recipe for target 'samples/statx/test-fsinfo' failed
samples/statx/test-statx.c: In function 'dump_statx':
samples/statx/test-statx.c:160:29: warning: format '%llx' expects argument of type 'long long unsigned int', but argument 2 has type '__u64 {aka long unsigned int}' [-Wformat=]
   printf("Attributes: %016llx (", stx->stx_attributes);
                       ~~~~~~^     ~~~~~~~~~~~~~~~~~~~
                       %016lx
samples/statx/test-fs-query.c: In function 'fsopen':
samples/statx/test-fs-query.c:32:17: error: '__NR_fsopen' undeclared (first use in this function); did you mean '__NR_open'?
  return syscall(__NR_fsopen, fs_name, flags);
                 ^~~~~~~~~~~
                 __NR_open
samples/statx/test-fs-query.c:32:17: note: each undeclared identifier is reported only once for each function it appears in
samples/statx/test-fs-query.c: In function 'fsinfo':
samples/statx/test-fs-query.c:38:17: error: '__NR_fsinfo' undeclared (first use in this function); did you mean '__NR_sysinfo'?
  return syscall(__NR_fsinfo, dfd, filename, params, buffer, buf_size);
                 ^~~~~~~~~~~
                 __NR_sysinfo
samples/statx/test-fs-query.c: In function 'fsopen':
samples/statx/test-fs-query.c:33:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
samples/statx/test-fs-query.c: In function 'fsinfo':
samples/statx/test-fs-query.c:39:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

Caused by commit

  ba5214f7f40c ("vfs: Implement parameter value retrieval with fsinfo()")

which enabled CONFIG_SAMPLE_STATX.  I have disabled that again.  I assume
that problem is that these syscalls are not yet wired up on PowerPC ...

-- 
Cheers,
Stephen Rothwell