linux.git/arch/nds32/kernel/vdso, branch v5.9

.gitignore: add SPDX License Identifier

2020-03-25T10:50:48+00:00

Add SPDX License Identifier to all .gitignore files.

Signed-off-by: Masahiro Yamada 
Signed-off-by: Greg Kroah-Hartman

y2038: vdso: nds32: open-code timespec_add_ns()

2019-11-15T13:38:28+00:00

The nds32 vdso is now the last user of the deprecated timespec_add_ns().

Change it to an open-coded version like the one it already uses in
do_realtime(). What we should really do though is to use the
generic vdso implementation that is now used in x86. arm and mips.

Signed-off-by: Arnd Bergmann

y2038: vdso: change timespec to __kernel_old_timespec

2019-11-15T13:38:28+00:00

In order to remove 'timespec' completely from the kernel, all
internal uses should be converted to a y2038-safe type, while
those that are only for compatibity with existing user space
should be marked appropriately.

Change vdso to use __kernel_old_timespec in order to avoid
the deprecated type and mark these interfaces as outdated.

Signed-off-by: Arnd Bergmann

y2038: vdso: change timeval to __kernel_old_timeval

2019-11-15T13:38:27+00:00

The gettimeofday() function in vdso uses the traditional 'timeval'
structure layout, which will be incompatible with future versions of
glibc on 32-bit architectures that use a 64-bit time_t.

This interface is problematic for y2038, when time_t overflows on 32-bit
architectures, but the plan so far is that a libc with 64-bit time_t
will not call into the gettimeofday() vdso helper at all, and only
have a method for entering clock_gettime().  This means we don't have
to fix it here, though we probably want to add a new clock_gettime()
entry point using a 64-bit version of 'struct timespec' at some point.

Changing the vdso code to use __kernel_old_timeval helps isolate
this usage from the other ones that still need to be fixed properly,
and it gets us closer to removing the 'timeval' definition from the
kernel sources.

Reviewed-by: Thomas Gleixner 
Signed-off-by: Arnd Bergmann

treewide: Add SPDX license identifier - Makefile/Kconfig

2019-05-21T08:50:46+00:00

Add SPDX license identifiers to all Make/Kconfig files which:

 - Have no license information of any form

These files fall under the project license, GPL v2 only. The resulting SPDX
license identifier is:

  GPL-2.0-only

Signed-off-by: Thomas Gleixner 
Signed-off-by: Greg Kroah-Hartman

nds32: Fix vDSO clock_getres()

2019-05-16T07:07:08+00:00

clock_getres in the vDSO library has to preserve the same behaviour
of posix_get_hrtimer_res().

In particular, posix_get_hrtimer_res() does:
    sec = 0;
    ns = hrtimer_resolution;
and hrtimer_resolution depends on the enablement of the high
resolution timers that can happen either at compile or at run time.

Fix the nds32 vdso implementation of clock_getres keeping a copy of
hrtimer_resolution in vdso data and using that directly.

Cc: Greentime Hu 
Cc: Vincent Chen 
Signed-off-by: Vincenzo Frascino 
Signed-off-by: Greentime Hu

nds32: vdso: drop unnecessary cc-ldoption

2019-05-07T09:52:10+00:00

Towards the goal of removing cc-ldoption, it seems that --hash-style=
was added to binutils 2.17.50.0.2 in 2006. The minimal required version
of binutils for the kernel according to
Documentation/process/changes.rst is 2.20.

Link: https://gcc.gnu.org/ml/gcc/2007-01/msg01141.html
Cc: clang-built-linux@googlegroups.com
Suggested-by: Masahiro Yamada 
Signed-off-by: Nick Desaulniers 
Acked-by: Greentime Hu 
Signed-off-by: Greentime Hu

nds32: vdso: fix and clean-up Makefile

2019-05-07T09:52:09+00:00

- $(call if_changed,...) must have FORCE as a prerequisite

- vdso.lds is a generated file, so it should be prefixed with
  $(obj)/ instead of $(src)/.

- cmd_vdsosym is a one-liner rule, so the assignment with '='
  is simpler.

Signed-off-by: Masahiro Yamada 
Acked-by: Greentime Hu 
Signed-off-by: Greentime Hu

nds32: add vmlinux.lds and vdso.so to .gitignore

2019-05-07T09:52:09+00:00

These are build artifacts, which should be ignored by git.

Signed-off-by: Masahiro Yamada 
Acked-by: Greentime Hu 
Signed-off-by: Greentime Hu

nds32: fix building failed if using elf toolchain.

2018-03-16T07:45:22+00:00

OUTPUT_FORMAT is not necessary here and the elf toolchain doesn't
support these formats. Since kernel should be built pass with elf
or Linux toolchain. This can be removed from vdso.ld.S

These are the built failed messages.
  VDSOL   arch/nds32/kernel/vdso/vdso.so.dbg
  /home/users/greentime/tmp/nds32le-elf-newlib-v3-upstream-b224/bin/../lib/gcc/nds32le-elf/8.0.1/../../../../nds32le-elf/bin/ld:
  target elf32-nds32le-linux not found
  collect2: error: ld returned 1 exit status
  make[1]: *** [arch/nds32/kernel/vdso/vdso.so.dbg] Error 1
  make: *** [vdso_prepare] Error 2

Signed-off-by: Greentime Hu