# git rev-parse -q --verify c0beffc4f4c658fde86d52c837e784326e9cc875^{commit}
# git fetch -q -n -f git://gitlab.ozlabs.ibm.com/linuxppc/linux.git next-test
# git rev-parse -q --verify c0beffc4f4c658fde86d52c837e784326e9cc875^{commit}
c0beffc4f4c658fde86d52c837e784326e9cc875
# 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-4.6.3-nolibc/sh4-linux/bin/sh4-linux-gcc --version
# < git log --format=%s --max-count=1 c0beffc4f4c658fde86d52c837e784326e9cc875
# < make -s -j 48 ARCH=sh O=/kisskb/build/powerpc-next_sh-defconfig_sh4 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/sh4-linux/bin/sh4-linux-  defconfig
# make -s -j 48 ARCH=sh O=/kisskb/build/powerpc-next_sh-defconfig_sh4 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/sh4-linux/bin/sh4-linux-  
  Generating include/generated/machtypes.h
<stdin>:1317:2: warning: #warning syscall pkey_mprotect not implemented [-Wcpp]
<stdin>:1320:2: warning: #warning syscall pkey_alloc not implemented [-Wcpp]
<stdin>:1323:2: warning: #warning syscall pkey_free not implemented [-Wcpp]
<stdin>:1326:2: warning: #warning syscall statx not implemented [-Wcpp]
/kisskb/src/arch/sh/kernel/cpu/sh4/../sh3/../../entry-common.S: Assembler messages:
/kisskb/src/arch/sh/kernel/cpu/sh4/../sh3/../../entry-common.S:389: Warning: overflow in branch to syscall_exit_work; converted into longer instruction sequence
/kisskb/src/arch/sh/kernel/cpu/sh4/../sh3/../../entry-common.S:392: Warning: overflow in branch to syscall_exit_work; converted into longer instruction sequence
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:183:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/cgroup/cgroup-v1.c: In function 'cgroup1_mount':
/kisskb/src/kernel/cgroup/cgroup-v1.c:1268:20: warning: 'root' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/rcu/srcutree.c: In function 'init_srcu_struct_fields':
/kisskb/src/kernel/rcu/srcutree.c:146:32: warning: 'levelspread[<Ucdc0>]' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/rcu/srcutree.c:94:6: note: 'levelspread[<Ucdc0>]' was declared here
/kisskb/src/mm/vmstat.c: In function 'sysctl_vm_numa_stat_handler':
/kisskb/src/mm/vmstat.c:89:5: warning: 'oldval' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/proc/inode.c: In function 'proc_reg_open':
/kisskb/src/include/linux/list.h:65:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/proc/inode.c:340:21: note: 'pdeo' was declared here
/kisskb/src/mm/hugetlb.c: In function 'alloc_pool_huge_page':
/kisskb/src/mm/hugetlb.c:1433:5: warning: 'page' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/ext4/readpage.c: In function 'ext4_mpage_readpages':
/kisskb/src/fs/ext4/readpage.c:294:1: warning: the frame size of 1200 bytes is larger than 1024 bytes [-Wframe-larger-than=]
/kisskb/src/drivers/base/regmap/regmap.c: In function 'regmap_raw_read':
/kisskb/src/drivers/base/regmap/regmap.c:2497:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/base/regmap/regmap.c: In function '_regmap_raw_write':
/kisskb/src/drivers/base/regmap/regmap.c:1819:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/mpage.c: In function 'do_mpage_readpage':
/kisskb/src/fs/mpage.c:316:1: warning: the frame size of 1088 bytes is larger than 1024 bytes [-Wframe-larger-than=]
/kisskb/src/fs/mpage.c: In function '__mpage_writepage':
/kisskb/src/fs/mpage.c:676:1: warning: the frame size of 1152 bytes is larger than 1024 bytes [-Wframe-larger-than=]
/kisskb/src/drivers/sh/clk/cpg.c: In function 'r8':
/kisskb/src/drivers/sh/clk/cpg.c:41:2: warning: passing argument 1 of 'ioread8' discards 'const' qualifier from pointer target type [enabled by default]
/kisskb/src/include/asm-generic/iomap.h:29:21: note: expected 'void *' but argument is of type 'const void *'
/kisskb/src/drivers/sh/clk/cpg.c: In function 'r16':
/kisskb/src/drivers/sh/clk/cpg.c:46:2: warning: passing argument 1 of 'ioread16' discards 'const' qualifier from pointer target type [enabled by default]
/kisskb/src/include/asm-generic/iomap.h:30:21: note: expected 'void *' but argument is of type 'const void *'
/kisskb/src/drivers/sh/clk/cpg.c: In function 'r32':
/kisskb/src/drivers/sh/clk/cpg.c:51:2: warning: passing argument 1 of 'ioread32' discards 'const' qualifier from pointer target type [enabled by default]
/kisskb/src/include/asm-generic/iomap.h:32:21: note: expected 'void *' but argument is of type 'const void *'
  Kernel: arch/sh/boot/zImage is ready
Completed OK
# rm -rf /kisskb/build/powerpc-next_sh-defconfig_sh4
# Build took: 0:00:39.334754