This is an update of a series I posted a long time ago [1], updating
the IPC subsystem to pass down 64-bit time stamps to user space.
In particular, for sys_msgctl, sys_semctl and sys_shmctl, I do not
introduce a completely new set of replacement system calls, but instead
extend the existing ones to return data in the reserved fields of the
normal data structure.
This should be completely transparent to any existing user space, and
only after the 32-bit time_t wraps, it will make a difference in the
returned data.
libc implementations will consequently have to provide their own data
structures when they move to 64-bit time_t, and convert the structures
in user space from the ones returned by the kernel.
There are three cases here:
- little-endian architectures (except powerpc and mips) can use
the normal layout and just cast the data structure to the user space
type that contains 64-bit numbers.
- parisc and sparc can do the same thing with big-endian user space
- little-endian powerpc and most big-endian architectures have
to flip the upper and lower 32-bit halves of the time_t value in memory,
but can otherwise keep using the normal layout
- mips and big-endian xtensa need to be more careful because
they are not consistent in their definitions, and they have to provide
custom libc implementations for the system calls to use 64-bit time_t.
Changes to the previous version include
- Rebased to the latest kernel (4.17-rc)
- Dropped changes for removed architectures
- Simplified the IPC code changes, based on prior work from
both Deepa and Eric
- Fixed a few bugs that I found during rebasing, in parcular the
sparc version was incorrect.
If everyone agrees with the series, I'd like to have it merged through
the tip tree once Deepa's earlier syscall series in there (I have both
in my y2038 tree [2]).
Arnd
[1] https://lkml.org/lkml/2015/5/20/605
[2] git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git y2038-next
Arnd Bergmann (13):
y2038: asm-generic: extend sysvipc data structures
y2038: alpha: remove unneeded ipc uapi header files
y2038: ia64: remove unneeded ipc uapi header files
y2038: s390: remove unneeded ipc uapi header files
y2038: arm64: extend sysvipc compat data structures
y2038: mips: extend sysvipc data structures
y2038: x86: extend sysvipc data structures
y2038: parisc: extend sysvipc data structures
y2038: sparc: extend sysvipc data structures
y2038: powerpc: extend sysvipc data structures
y2038: xtensa: extend sysvipc data structures
y2038: ipc: use ktime_get_real_seconds consistently
y2038: ipc: report long times to user space
Cc: linux-api@xxxxxxxxxxxxxxx
Cc: linux-arch@xxxxxxxxxxxxxxx
Cc: libc-alpha@xxxxxxxxxxxxxx
Cc: tglx@xxxxxxxxxxxxx
Cc: deepa.kernel@xxxxxxxxx
Cc: viro@xxxxxxxxxxxxxxxxxx
Cc: ebiederm@xxxxxxxxxxxx
Cc: albert.aribaud@xxxxxxxx
Cc: linux-s390@xxxxxxxxxxxxxxx
Cc: schwidefsky@xxxxxxxxxx
Cc: x86@xxxxxxxxxx
Cc: catalin.marinas@xxxxxxx
Cc: will.deacon@xxxxxxx
Cc: linux-mips@xxxxxxxxxxxxxx
Cc: jhogan@xxxxxxxxxx
Cc: ralf@xxxxxxxxxxxxxx
Cc: linuxppc-dev@xxxxxxxxxxxxxxxx
Cc: sparclinux@xxxxxxxxxxxxxxx
arch/alpha/include/asm/Kbuild | 4 +++
arch/alpha/include/uapi/asm/ipcbuf.h | 2 --
arch/alpha/include/uapi/asm/msgbuf.h | 28 -----------------
arch/alpha/include/uapi/asm/sembuf.h | 23 --------------
arch/alpha/include/uapi/asm/shmbuf.h | 39 -----------------------
arch/arm64/include/asm/compat.h | 32 +++++++++----------
arch/ia64/include/asm/Kbuild | 4 +++
arch/ia64/include/uapi/asm/ipcbuf.h | 2 --
arch/ia64/include/uapi/asm/msgbuf.h | 28 -----------------
arch/ia64/include/uapi/asm/sembuf.h | 23 --------------
arch/ia64/include/uapi/asm/shmbuf.h | 39 -----------------------
arch/mips/include/asm/compat.h | 38 ++++++++++++-----------
arch/mips/include/uapi/asm/msgbuf.h | 57 ++++++++++++++++++++++------------
arch/mips/include/uapi/asm/sembuf.h | 15 +++++++--
arch/mips/include/uapi/asm/shmbuf.h | 23 ++++++++++++--
arch/parisc/include/asm/compat.h | 32 +++++++++----------
arch/parisc/include/uapi/asm/msgbuf.h | 33 ++++++++++----------
arch/parisc/include/uapi/asm/sembuf.h | 16 +++++-----
arch/parisc/include/uapi/asm/shmbuf.h | 19 +++++-------
arch/powerpc/include/asm/compat.h | 32 +++++++++----------
arch/powerpc/include/uapi/asm/msgbuf.h | 18 +++++------
arch/powerpc/include/uapi/asm/sembuf.h | 14 ++++-----
arch/powerpc/include/uapi/asm/shmbuf.h | 19 +++++-------
arch/s390/include/asm/Kbuild | 3 ++
arch/s390/include/asm/compat.h | 32 +++++++++----------
arch/s390/include/uapi/asm/msgbuf.h | 38 -----------------------
arch/s390/include/uapi/asm/sembuf.h | 30 ------------------
arch/s390/include/uapi/asm/shmbuf.h | 49 -----------------------------
arch/sparc/include/asm/compat.h | 32 +++++++++----------
arch/sparc/include/uapi/asm/msgbuf.h | 22 ++++++-------
arch/sparc/include/uapi/asm/sembuf.h | 16 +++++-----
arch/sparc/include/uapi/asm/shmbuf.h | 21 ++++++-------
arch/x86/include/asm/compat.h | 32 +++++++++----------
arch/x86/include/uapi/asm/Kbuild | 5 ++-
arch/x86/include/uapi/asm/msgbuf.h | 1 -
arch/x86/include/uapi/asm/sembuf.h | 11 ++++++-
arch/x86/include/uapi/asm/shmbuf.h | 1 -
arch/xtensa/include/uapi/asm/msgbuf.h | 25 +++++++--------
arch/xtensa/include/uapi/asm/sembuf.h | 17 +++++-----
arch/xtensa/include/uapi/asm/shmbuf.h | 37 +++++-----------------
include/uapi/asm-generic/msgbuf.h | 17 +++++-----
include/uapi/asm-generic/sembuf.h | 26 ++++++++++------
include/uapi/asm-generic/shmbuf.h | 17 +++++-----
ipc/msg.c | 20 ++++++++----
ipc/sem.c | 20 ++++++++----
ipc/shm.c | 14 +++++++--
46 files changed, 393 insertions(+), 633 deletions(-)
delete mode 100644 arch/alpha/include/uapi/asm/ipcbuf.h
delete mode 100644 arch/alpha/include/uapi/asm/msgbuf.h
delete mode 100644 arch/alpha/include/uapi/asm/sembuf.h
delete mode 100644 arch/alpha/include/uapi/asm/shmbuf.h
delete mode 100644 arch/ia64/include/uapi/asm/ipcbuf.h
delete mode 100644 arch/ia64/include/uapi/asm/msgbuf.h
delete mode 100644 arch/ia64/include/uapi/asm/sembuf.h
delete mode 100644 arch/ia64/include/uapi/asm/shmbuf.h
delete mode 100644 arch/s390/include/uapi/asm/msgbuf.h
delete mode 100644 arch/s390/include/uapi/asm/sembuf.h
delete mode 100644 arch/s390/include/uapi/asm/shmbuf.h
delete mode 100644 arch/x86/include/uapi/asm/msgbuf.h
delete mode 100644 arch/x86/include/uapi/asm/shmbuf.h
--
2.9.0
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