# git rev-parse -q --verify c0beffc4f4c658fde86d52c837e784326e9cc875^{commit}
c0beffc4f4c658fde86d52c837e784326e9cc875
already have revision, skipping fetch
# git checkout -q -f -B kisskb c0beffc4f4c658fde86d52c837e784326e9cc875
# git clean -qxdf
# < git log -1
# commit c0beffc4f4c658fde86d52c837e784326e9cc875
# Author: Nicholas Piggin <npiggin@gmail.com>
# Date:   Tue May 15 01:59:46 2018 +1000
# 
#     powerpc/powernv: Fix opal_event_shutdown() called with interrupts disabled
#     
#     A kernel crash in process context that calls emergency_restart from
#     panic will end up calling opal_event_shutdown with interrupts disabled
#     but not in interrupt. This causes a sleeping function to be called
#     which gives the following warning with sysrq+c:
#     
#         Rebooting in 10 seconds..
#         BUG: sleeping function called from invalid context at kernel/locking/mutex.c:238
#         in_atomic(): 0, irqs_disabled(): 1, pid: 7669, name: bash
#         CPU: 20 PID: 7669 Comm: bash Tainted: G      D W         4.17.0-rc5+ #3
#         Call Trace:
#         dump_stack+0xb0/0xf4 (unreliable)
#         ___might_sleep+0x174/0x1a0
#         mutex_lock+0x38/0xb0
#         __free_irq+0x68/0x460
#         free_irq+0x70/0xc0
#         opal_event_shutdown+0xb4/0xf0
#         opal_shutdown+0x24/0xa0
#         pnv_shutdown+0x28/0x40
#         machine_shutdown+0x44/0x60
#         machine_restart+0x28/0x80
#         emergency_restart+0x30/0x50
#         panic+0x2a0/0x328
#         oops_end+0x1ec/0x1f0
#         bad_page_fault+0xe8/0x154
#         handle_page_fault+0x34/0x38
#         --- interrupt: 300 at sysrq_handle_crash+0x44/0x60
#         LR = __handle_sysrq+0xfc/0x260
#         flag_spec.62335+0x12b844/0x1e8db4 (unreliable)
#         __handle_sysrq+0xfc/0x260
#         write_sysrq_trigger+0xa8/0xb0
#         proc_reg_write+0xac/0x110
#         __vfs_write+0x6c/0x240
#         vfs_write+0xd0/0x240
#         ksys_write+0x6c/0x110
#     
#     Fixes: 9f0fd0499d30 ("powerpc/powernv: Add a virtual irqchip for opal events")
#     Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
# < /opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < git log --format=%s --max-count=1 c0beffc4f4c658fde86d52c837e784326e9cc875
# < make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-next_ppc64_defconfig+NO_ALTIVEC_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  ppc64_defconfig
# Added to kconfig CONFIG_ALTIVEC=n
# Added to kconfig CONFIG_PPC_TRANSACTIONAL_MEM=n
# yes \n | make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-next_ppc64_defconfig+NO_ALTIVEC_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  oldconfig
yes: standard output: Broken pipe
yes: write error
# make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-next_ppc64_defconfig+NO_ALTIVEC_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
Completed OK
# rm -rf /kisskb/build/powerpc-next_ppc64_defconfig+NO_ALTIVEC_powerpc-5.3
# Build took: 0:02:56.444912