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libspl: implement atomics in terms of atomics

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This replaces the generic libspl atomic.c atomics implementation
with one based on builtin gcc atomics.  This functionality was added
as an experimental feature in gcc 4.4.  Today even CentOS 7 ships
with gcc 4.8 as the default compiler we can make this the default.

Furthermore, the builtin atomics are as good or better than our
hand-rolled implementation so it's reasonable to drop that custom code.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #11904
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2021-04-19 07:13:24 +02:00
committed by GitHub
parent 50d9ff93df
commit fef8bd41fc
8 changed files with 84 additions and 1697 deletions
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config/user.m4
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@@ -21,6 +21,7 @@ AC_DEFUN([ZFS_AC_CONFIG_USER], [
ZFS_AC_CONFIG_USER_LIBUDEV
ZFS_AC_CONFIG_USER_LIBCRYPTO
ZFS_AC_CONFIG_USER_LIBAIO
ZFS_AC_CONFIG_USER_LIBATOMIC
ZFS_AC_CONFIG_USER_CLOCK_GETTIME
ZFS_AC_CONFIG_USER_PAM
ZFS_AC_CONFIG_USER_RUNSTATEDIR