tree 6daab2fb056c1824eabe964c778a09032eacad4a
parent da9f25875958757fd1f16b74bd887977e78c8b09
author Willy Tarreau <w@1wt.eu> 1663406129 +0200
committer Willy Tarreau <w@1wt.eu> 1663406444 +0200
encoding latin1

BUILD: fd: fix a build warning on the DWCAS

Ilya reported in issue #1816 a build warning on armhf (promoted to error
here since -Werror):

  src/fd.c: In function fd_rm_from_fd_list:
  src/fd.c:209:87: error: passing argument 3 of __ha_cas_dw discards volatile qualifier from pointer target type [-Werror=discarded-array-qualifiers]
    209 |    unlikely(!_HA_ATOMIC_DWCAS(((long *)&fdtab[fd].update), (uint32_t *)&cur_list.u32, &next_list.u32))
        |                                                                                       ^~~~~~~~~~~~~~

This happens only on such an architecture because the DWCAS requires the
pointer not the value, and gcc seems to be needlessly picky about reading
a const from a volatile! This may safely be backported to older versions.