# git rev-parse -q --verify 4b820e167bf6f410ace479d8df5b15a574000e75^{commit}
4b820e167bf6f410ace479d8df5b15a574000e75
already have revision, skipping fetch
# git checkout -q -f -B kisskb 4b820e167bf6f410ace479d8df5b15a574000e75
# git clean -qxdf
# < git log -1
# commit 4b820e167bf6f410ace479d8df5b15a574000e75
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Fri Jul 2 22:05:52 2021 -0700
# 
#     Revert "ALSA: usb-audio: Reduce latency at playback start"
#     
#     This reverts commit 9ce650a75a3b262c90789b42aedee8fc2ee04d53.
#     
#     This commit causes watchdog lockups on my machine, and while I have no
#     idea what the cause is, it bisected right to this commit, and reverting
#     the change promptly fixes it.
#     
#     At least occasionally one of the watchdog call traces was
#     
#       Call Trace:
#         _raw_spin_lock_irqsave+0x35/0x40
#         snd_pcm_period_elapsed+0x1b/0xa0 [snd_pcm]
#         snd_usb_endpoint_start+0x1a0/0x3c0 [snd_usb_audio]
#         start_endpoints+0x23/0x90 [snd_usb_audio]
#         snd_usb_substream_playback_trigger+0x7b/0x1a0 [snd_usb_audio]
#         snd_pcm_common_ioctl+0x1c44/0x2360 [snd_pcm]
#         snd_pcm_ioctl+0x2e/0x40 [snd_pcm]
#         __se_sys_ioctl+0x72/0xc0
#         do_syscall_64+0x4c/0xa0
#         entry_SYSCALL_64_after_hwframe+0x44/0xae
#     
#     so presumably it's a locking error on that substream spinlock that
#     snd_pcm_period_elapsed() takes.  But at this point I just want to have a
#     working system so that I can continue the merge window work tomorrow.
#     
#     Cc: Takashi Iwai <tiwai@suse.de>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux-gcc --version
# < /opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux-ld --version
# < git log --format=%s --max-count=1 4b820e167bf6f410ace479d8df5b15a574000e75
# < make -s -j 32 ARCH=um O=/kisskb/build/linus_um-allyesconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 allyesconfig
# Added to kconfig CONFIG_STANDALONE=y
# Added to kconfig CONFIG_KCOV=n
# Added to kconfig CONFIG_GCC_PLUGINS=n
# Added to kconfig CONFIG_GCC_PLUGIN_CYC_COMPLEXITY=n
# Added to kconfig CONFIG_GCC_PLUGIN_SANCOV=n
# Added to kconfig CONFIG_GCC_PLUGIN_LATENT_ENTROPY=n
# Added to kconfig CONFIG_GCC_PLUGIN_STRUCTLEAK=n
# Added to kconfig CONFIG_GCC_PLUGIN_RANDSTRUCT=n
# Added to kconfig CONFIG_UML_NET=n
# Added to kconfig CONFIG_UML_NET_ETHERTAP=n
# Added to kconfig CONFIG_UML_NET_TUNTAP=n
# Added to kconfig CONFIG_UML_NET_SLIP=n
# Added to kconfig CONFIG_UML_NET_DAEMON=n
# Added to kconfig CONFIG_UML_NET_VDE=n
# Added to kconfig CONFIG_UML_NET_MCAST=n
# Added to kconfig CONFIG_UML_NET_PCAP=n
# Added to kconfig CONFIG_UML_NET_SLIRP=n
# Added to kconfig CONFIG_GCOV_KERNEL=n
# Added to kconfig CONFIG_DEBUG_INFO_BTF=n
# Added to kconfig CONFIG_BPF_PRELOAD=n
# < make -s -j 32 ARCH=um O=/kisskb/build/linus_um-allyesconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 help
# make -s -j 32 ARCH=um O=/kisskb/build/linus_um-allyesconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 olddefconfig
.config:4594:warning: override: reassigning to symbol GCC_PLUGIN_CYC_COMPLEXITY
.config:4596:warning: override: reassigning to symbol GCC_PLUGIN_LATENT_ENTROPY
.config:4600:warning: override: reassigning to symbol UML_NET_ETHERTAP
.config:4602:warning: override: reassigning to symbol UML_NET_SLIP
.config:4605:warning: override: reassigning to symbol UML_NET_MCAST
.config:4607:warning: override: reassigning to symbol UML_NET_SLIRP
# make -s -j 32 ARCH=um O=/kisskb/build/linus_um-allyesconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 
  LINK linux
Completed OK
# rm -rf /kisskb/build/linus_um-allyesconfig_um-x86_64
# Build took: 0:06:53.996155