[taking this thread to -devel]
> On 20. Oct 2017, at 12:04, Stephan Wiesand <[email protected]> wrote:
>
> I ran configure against the EL7.3 and EL7.4 GA kernels (3.10.0-514.el7 and
> 3.10.0-696.el7) and compared the results.
>
> Besides the fact that in the 7.4 case conftest.c is compiled with an
> additional -DCONFIG_AVX512, which I doubt makes a difference, there are some
> differences in configure test results:
>
> 7.3 7.4
> locks_lock_file_wait no yes
> inode_lock no yes
> exported tasklist_lock yes no
It turns out the EL7.4 kernel turns tasklist_lock from an rwlock_t into a
qrwlock_t and all read_{,un}lock() calls into qread_{,un}lock() ones. And no,
it's not what mainline kernels do, including 4.14-rc5.
We should probably adapt to this, and I guess it shouldn't be too hard, but is
this change likely to be the reason for more frequent getcwd() problems?
--
Stephan Wiesand
DESY -DV-
Platanenallee 6
15738 Zeuthen, Germany
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