# git rev-parse -q --verify e04ec0de61c1eb9693179093e83ab8ca68a30d08^{commit}
e04ec0de61c1eb9693179093e83ab8ca68a30d08
already have revision, skipping fetch
# git checkout -q -f -B kisskb e04ec0de61c1eb9693179093e83ab8ca68a30d08
# git clean -qxdf
# < git log -1
# commit e04ec0de61c1eb9693179093e83ab8ca68a30d08
# Author: Daniel Jordan <daniel.m.jordan@oracle.com>
# Date:   Mon Jun 8 17:26:52 2020 -0400
# 
#     padata: upgrade smp_mb__after_atomic to smp_mb in padata_do_serial
#     
#     A 5.7 kernel hangs during a tcrypt test of padata that waits for an AEAD
#     request to finish.  This is only seen on large machines running many
#     concurrent requests.
#     
#     The issue is that padata never serializes the request.  The removal of
#     the reorder_objects atomic missed that the memory barrier in
#     padata_do_serial() depends on it.
#     
#     Upgrade the barrier from smp_mb__after_atomic to smp_mb to get correct
#     ordering again.
#     
#     Fixes: 3facced7aeed1 ("padata: remove reorder_objects")
#     Signed-off-by: Daniel Jordan <daniel.m.jordan@oracle.com>
#     Cc: Steffen Klassert <steffen.klassert@secunet.com>
#     Cc: linux-kernel@vger.kernel.org
#     Cc: <stable@vger.kernel.org>
#     Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
# < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 e04ec0de61c1eb9693179093e83ab8ca68a30d08
# < make -s -j 24 ARCH=powerpc O=/kisskb/build/crypto_ppc64_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  ppc64_defconfig
# < make -s -j 24 ARCH=powerpc O=/kisskb/build/crypto_ppc64_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 24 ARCH=powerpc O=/kisskb/build/crypto_ppc64_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
# make -s -j 24 ARCH=powerpc O=/kisskb/build/crypto_ppc64_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  
Completed OK
# rm -rf /kisskb/build/crypto_ppc64_defconfig_powerpc-gcc4.9
# Build took: 0:03:17.346448