linux-kernel - [PATCH v2 00/11] Start porting UML to nolibc

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Message-ID: <20250919153420.727385-1-benjamin@sipsolutions.net>
Date: Fri, 19 Sep 2025 17:34:09 +0200
From: Benjamin Berg <benjamin@...solutions.net>
To: linux-um@...ts.infradead.org,
	Willy Tarreau <w@....eu>,
	Thomas Weißschuh <linux@...ssschuh.net>,
	linux-kselftest@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: linux-kernel@...r.kernel.org,
	Benjamin Berg <benjamin.berg@...el.com>
Subject: [PATCH v2 00/11] Start porting UML to nolibc

From: Benjamin Berg <benjamin.berg@...el.com>

This patchset is an attempt to start a nolibc port of UML. The goal is
to port UML to use nolibc in smaller chunks to make the switch more
manageable.

There are three parts to this patchset:
 * Two patches to use tools/include headers instead of kernel headers
   for userspace files.
 * A few nolibc fixes and a new NOLIBC_NO_STARTCODE compile flag for it
 * Finally nolibc build support for UML and switching two files while
   adding the appropriate support in nolibc itself.

v1 of this patchset was
  https://lore.kernel.org/all/20250915071115.1429196-1-benjamin@sipsolutions.net/

Changes in v2:
- add sys/uio.h and sys/ptrace.h to nolibc
- Use NOLIBC_NO_RUNTIME to disable nolibc startup code
- Fix out-of-tree build
- various small improvements and cleanups

Should the nolibc changes be merged separately or could everything go
through the same branch?

Also, what about tools/include/linux/compiler.h? It seems that was added
for the tracing code, but it is not clear to me who might ACK that fix.

Benjamin

Benjamin Berg (11):
  tools compiler.h: fix __used definition
  um: use tools/include for user files
  tools/nolibc/stdio: remove perror if NOLIBC_IGNORE_ERRNO is set
  tools/nolibc/dirent: avoid errno in readdir_r
  tools/nolibc: use __fallthrough__ rather than fallthrough
  tools/nolibc: add option to disable runtime
  um: add infrastructure to build files using nolibc
  um: use nolibc for the --showconfig implementation
  tools/nolibc: add uio.h with readv and writev
  tools/nolibc: add ptrace support
  um: switch ptrace FP register access to nolibc

 arch/um/Makefile                             | 38 +++++++++++---
 arch/um/include/shared/init.h                |  2 +-
 arch/um/include/shared/os.h                  |  2 +
 arch/um/include/shared/user.h                |  6 ---
 arch/um/kernel/Makefile                      |  2 +-
 arch/um/kernel/skas/stub.c                   |  1 +
 arch/um/kernel/skas/stub_exe.c               |  4 +-
 arch/um/os-Linux/skas/process.c              |  6 +--
 arch/um/os-Linux/start_up.c                  |  4 +-
 arch/um/scripts/Makefile.rules               | 10 +++-
 arch/x86/um/Makefile                         |  6 ++-
 arch/x86/um/os-Linux/Makefile                |  5 +-
 arch/x86/um/os-Linux/registers.c             | 16 ++----
 arch/x86/um/user-offsets.c                   |  1 -
 tools/include/linux/compiler.h               |  2 +-
 tools/include/nolibc/Makefile                |  2 +
 tools/include/nolibc/arch-arm.h              |  2 +
 tools/include/nolibc/arch-arm64.h            |  2 +
 tools/include/nolibc/arch-loongarch.h        |  2 +
 tools/include/nolibc/arch-m68k.h             |  2 +
 tools/include/nolibc/arch-mips.h             |  2 +
 tools/include/nolibc/arch-powerpc.h          |  2 +
 tools/include/nolibc/arch-riscv.h            |  2 +
 tools/include/nolibc/arch-s390.h             |  2 +
 tools/include/nolibc/arch-sh.h               |  2 +
 tools/include/nolibc/arch-sparc.h            |  2 +
 tools/include/nolibc/arch-x86.h              |  4 ++
 tools/include/nolibc/compiler.h              |  4 +-
 tools/include/nolibc/crt.h                   |  3 ++
 tools/include/nolibc/dirent.h                |  6 +--
 tools/include/nolibc/nolibc.h                |  2 +
 tools/include/nolibc/stackprotector.h        |  2 +
 tools/include/nolibc/stdio.h                 |  2 +
 tools/include/nolibc/stdlib.h                |  2 +
 tools/include/nolibc/sys.h                   |  3 +-
 tools/include/nolibc/sys/auxv.h              |  3 ++
 tools/include/nolibc/sys/ptrace.h            | 52 ++++++++++++++++++++
 tools/include/nolibc/sys/uio.h               | 49 ++++++++++++++++++
 tools/testing/selftests/nolibc/nolibc-test.c | 11 +++++
 39 files changed, 222 insertions(+), 48 deletions(-)
 create mode 100644 tools/include/nolibc/sys/ptrace.h
 create mode 100644 tools/include/nolibc/sys/uio.h

-- 
2.51.0