Hi all,

After merging the vfs tree, today's linux-next build (x86_64 allmodconfig)
failed like this:

In file included from arch/x86/include/asm/elf.h:8,
                 from include/linux/elf.h:6,
                 from include/linux/elfcore-compat.h:5,
                 from fs/compat_binfmt_elf.c:17:
fs/binfmt_elf.c: In function 'fill_thread_core_info':
arch/x86/include/asm/elfcore-compat.h:23:20: error: 'TIF_X32' undeclared (first use in this function)
   23 |  (test_thread_flag(TIF_X32) \
      |                    ^~~~~~~
include/linux/thread_info.h:116:45: note: in definition of macro 'test_thread_flag'
  116 |  test_ti_thread_flag(current_thread_info(), flag)
      |                                             ^~~~
fs/binfmt_elf.c:1744:5: note: in expansion of macro 'PRSTATUS_SIZE'
 1744 |     PRSTATUS_SIZE, &t->prstatus);
      |     ^~~~~~~~~~~~~
arch/x86/include/asm/elfcore-compat.h:23:20: note: each undeclared identifier is reported only once for each function it appears in
   23 |  (test_thread_flag(TIF_X32) \
      |                    ^~~~~~~
include/linux/thread_info.h:116:45: note: in definition of macro 'test_thread_flag'
  116 |  test_ti_thread_flag(current_thread_info(), flag)
      |                                             ^~~~
fs/binfmt_elf.c:1744:5: note: in expansion of macro 'PRSTATUS_SIZE'
 1744 |     PRSTATUS_SIZE, &t->prstatus);
      |     ^~~~~~~~~~~~~

Caused by commit

  5a9b7f382248 ("binfmt_elf: partially sanitize PRSTATUS_SIZE and SET_PR_FPVALID")

or maybe commit

  9866fcab1c65 ("[elfcore-compat][amd64] clean PRSTATUS_SIZE/SET_PR_FPVALID up properly")

I have used the vfs tree from next-20210104 for today.

-- 
Cheers,
Stephen Rothwell