[GIT PULL] signal enhancements for v5.11-rc1

[Eric W. Biederman]

Please pull the signal-for-v5.11 branch from the git tree:

   git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace.git signal-for-v5.11

   HEAD: bc54a5cda97917155b8da0d99afe1dc0ed0b30db signal/parisc: Remove parisc specific definition of __ARCH_UAPI_SA_FLAGS

This is the work from Peter Collingbourne to add an new signal action
flag SA_EXPOSE_TAGBITS on arm64.  There was a lot of discussion leading
up to this and ultimately we were able to channel the original proposal
into something that is much more maintainable than an arm64 specific
hack.

Most of this I believe has already come in through Catalin Marinas pull
request "arm64 updates for 5.11".  As I took the generic bits of the
cleanup and place it in a non-rebasing branch.  There is a compile fix
for parisc that was caught late that I don't believe Catalin picked up.

The generic changes are mostly about removing never used HP-UX
compatibility from parisc headers and consolidating the SA_* flags
definitions into a generic header as much as possible.  We only have 32
SA_* flag bits total, so we need to be careful.  But as this is the
first addition in a decade or so I think we are fine for the forseeable
future.

Eric W. Biederman (1):
      signal/parisc: Remove parisc specific definition of __ARCH_UAPI_SA_FLAGS

Helge Deller (1):
      parisc: Drop parisc special case for __sighandler_t

Peter Collingbourne (6):
      parisc: start using signal-defs.h
      arch: move SA_* definitions to generic headers
      signal: clear non-uapi flag bits when passing/returning sa_flags
      arch: provide better documentation for the arch-specific SA_* flags
      signal: define the SA_UNSUPPORTED bit in sa_flags
      signal: define the SA_EXPOSE_TAGBITS bit in sa_flags

 arch/alpha/include/uapi/asm/signal.h   | 14 --------
 arch/arm/include/asm/signal.h          |  2 ++
 arch/arm/include/uapi/asm/signal.h     | 27 ++-------------
 arch/h8300/include/uapi/asm/signal.h   | 24 -------------
 arch/ia64/include/uapi/asm/signal.h    | 24 -------------
 arch/m68k/include/uapi/asm/signal.h    | 24 -------------
 arch/mips/include/uapi/asm/signal.h    | 12 -------
 arch/parisc/include/uapi/asm/signal.h  | 34 +-----------------
 arch/powerpc/include/uapi/asm/signal.h | 24 -------------
 arch/s390/include/uapi/asm/signal.h    | 24 -------------
 arch/sparc/include/uapi/asm/signal.h   |  4 +--
 arch/x86/include/uapi/asm/signal.h     | 24 -------------
 arch/x86/kernel/signal_compat.c        |  7 ----
 arch/xtensa/include/uapi/asm/signal.h  | 24 -------------
 include/linux/signal.h                 | 14 ++++++++
 include/linux/signal_types.h           | 12 +++++++
 include/uapi/asm-generic/signal-defs.h | 63 ++++++++++++++++++++++++++++++++++
 include/uapi/asm-generic/signal.h      | 29 ----------------
 kernel/signal.c                        | 40 +++++++++++++++++++++
 19 files changed, 136 insertions(+), 290 deletions(-)

Eric