# git rev-parse -q --verify abc3fce76adbdfa8f87272c784b388cd20b46049^{commit}
abc3fce76adbdfa8f87272c784b388cd20b46049
already have revision, skipping fetch
# git checkout -q -f -B kisskb abc3fce76adbdfa8f87272c784b388cd20b46049
# git clean -qxdf
# < git log -1
# commit abc3fce76adbdfa8f87272c784b388cd20b46049
# Author: Nicholas Piggin <npiggin@gmail.com>
# Date:   Thu Apr 2 22:04:01 2020 +1000
# 
#     Revert "powerpc/64: irq_work avoid interrupt when called with hardware irqs enabled"
#     
#     This reverts commit ebb37cf3ffd39fdb6ec5b07111f8bb2f11d92c5f.
#     
#     That commit does not play well with soft-masked irq state
#     manipulations in idle, interrupt replay, and possibly others due to
#     tracing code sometimes using irq_work_queue (e.g., in
#     trace_hardirqs_on()). That can cause PACA_IRQ_DEC to become set when
#     it is not expected, and be ignored or cleared or cause warnings.
#     
#     The net result seems to be missing an irq_work until the next timer
#     interrupt in the worst case which is usually not going to be noticed,
#     however it could be a long time if the tick is disabled, which is
#     against the spirit of irq_work and might cause real problems.
#     
#     The idea is still solid, but it would need more work. It's not really
#     clear if it would be worth added complexity, so revert this for
#     now (not a straight revert, but replace with a comment explaining why
#     we might see interrupts happening, and gives git blame something to
#     find).
#     
#     Fixes: ebb37cf3ffd3 ("powerpc/64: irq_work avoid interrupt when called with hardware irqs enabled")
#     Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20200402120401.1115883-1-npiggin@gmail.com
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-gcc --version
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-ld --version
# < git log --format=%s --max-count=1 abc3fce76adbdfa8f87272c784b388cd20b46049
# < make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-next_maple_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  maple_defconfig
# < make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-next_maple_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  help
# make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-next_maple_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  olddefconfig
# make -s -j 32 ARCH=powerpc O=/kisskb/build/powerpc-next_maple_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  
/kisskb/src/fs/proc/inode.c: In function 'proc_reg_open':
/kisskb/src/include/linux/list.h:72:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/proc/inode.c:338:21: note: 'pdeo' was declared here
/kisskb/src/fs/ext4/extents.c: In function 'ext4_convert_unwritten_io_end_vec':
/kisskb/src/fs/ext4/extents.c:5009:23: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:204:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/tty/serial/8250/8250_core.c: In function 'univ8250_release_irq':
/kisskb/src/drivers/tty/serial/8250/8250_core.c:248:18: warning: 'i' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/tty/serial/8250/8250_core.c:228:19: note: 'i' was declared here
/kisskb/src/mm/hugetlb.c: In function 'alloc_pool_huge_page':
/kisskb/src/mm/hugetlb.c:1426:5: warning: 'page' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/io_uring.c: In function '__io_sqe_files_update':
/kisskb/src/fs/io_uring.c:5824:13: warning: 'err' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/usb/core/devio.c: In function 'async_completed':
/kisskb/src/drivers/usb/core/devio.c:625:23: warning: 'errno' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/trace/trace_events.c: In function 'event_create_dir':
/kisskb/src/kernel/trace/trace_events.c:2040:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]
Completed OK
# rm -rf /kisskb/build/powerpc-next_maple_defconfig_powerpc-gcc4.6
# Build took: 0:01:19.960391