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[v3,0/7] selftests/x86: fix build errors and warnings found via clang

Message ID 20240531193838.108454-1-jhubbard@nvidia.com
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Series selftests/x86: fix build errors and warnings found via clang | expand

Message

John Hubbard May 31, 2024, 7:38 p.m. UTC 
Hi,

Dave Hansen, Muhammad Usama Anjum, here is the combined series that we
discussed yesterday [1].

As I mentioned then, this is a bit intrusive--but no more than
necessary, IMHO. Specifically, it moves some clang-un-inlineable things
out to "pure" assembly code files.

I've tested this by building with clang, then running each binary on my
x86_64 test system with today's 6.10-rc1, and comparing the console and
dmesg output to a gcc-based build without these patches applied. Aside
from timestamps and virtual addresses, it looks identical.

Earlier cover letter:

Just a bunch of build and warnings fixes that show up when building with
clang. Some of these depend on each other, so I'm sending them as a
series.

Changes since v2:

1) Dropped my test_FISTTP.c patch, and picked up Muhammad's fix instead,
   seeing as how that was posted first.

2) Updated patch descriptions to reflect that Valentin Obst's build fix
   for LLVM [1] has already been merged into Linux main.

3) Minor wording and typo corrections in the commit logs throughout.

Changes since the first version:
1) Rebased onto Linux 6.10-rc1

Enjoy!

[1] https://lore.kernel.org/44428518-4d21-4de7-8587-04eceefb330d@nvidia.com

thanks,
John Hubbard

John Hubbard (6):
  selftests/x86: fix Makefile dependencies to work with clang
  selftests/x86: build fsgsbase_restore.c with clang
  selftests/x86: build sysret_rip.c with clang
  selftests/x86: avoid -no-pie warnings from clang during compilation
  selftests/x86: remove (or use) unused variables and functions
  selftests/x86: fix printk warnings reported by clang

Muhammad Usama Anjum (1):
  selftests: x86: test_FISTTP: use fisttps instead of ambiguous fisttp

 tools/testing/selftests/x86/Makefile          | 31 +++++++++++++++----
 tools/testing/selftests/x86/amx.c             | 16 ----------
 .../testing/selftests/x86/clang_helpers_32.S  | 11 +++++++
 .../testing/selftests/x86/clang_helpers_64.S  | 28 +++++++++++++++++
 tools/testing/selftests/x86/fsgsbase.c        |  6 ----
 .../testing/selftests/x86/fsgsbase_restore.c  | 11 +++----
 tools/testing/selftests/x86/sigreturn.c       |  2 +-
 .../testing/selftests/x86/syscall_arg_fault.c |  1 -
 tools/testing/selftests/x86/sysret_rip.c      | 20 ++++--------
 tools/testing/selftests/x86/test_FISTTP.c     |  8 ++---
 tools/testing/selftests/x86/test_vsyscall.c   | 15 +++------
 tools/testing/selftests/x86/vdso_restorer.c   |  2 ++
 12 files changed, 87 insertions(+), 64 deletions(-)
 create mode 100644 tools/testing/selftests/x86/clang_helpers_32.S
 create mode 100644 tools/testing/selftests/x86/clang_helpers_64.S


base-commit: 4a4be1ad3a6efea16c56615f31117590fd881358