# git rev-parse -q --verify a3ac7917b73070010c05b4485b8582a6c9cd69b6^{commit}
a3ac7917b73070010c05b4485b8582a6c9cd69b6
already have revision, skipping fetch
# git checkout -q -f -B kisskb a3ac7917b73070010c05b4485b8582a6c9cd69b6
# git clean -qxdf
# < git log -1
# commit a3ac7917b73070010c05b4485b8582a6c9cd69b6
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Mon Mar 25 14:49:00 2019 -0700
# 
#     Revert "parport: daisy: use new parport device model"
#     
#     This reverts commit 1aec4211204d9463d1fd209eb50453de16254599.
#     
#     Steven Rostedt reports that it causes a hang at bootup and bisected it
#     to this commit.
#     
#     The troigger is apparently a module alias for "parport_lowlevel" that
#     points to "parport_pc", which causes a hang with
#     
#         modprobe -q -- parport_lowlevel
#     
#     blocking forever with a backtrace like this:
#     
#         wait_for_completion_killable+0x1c/0x28
#         call_usermodehelper_exec+0xa7/0x108
#         __request_module+0x351/0x3d8
#         get_lowlevel_driver+0x28/0x41 [parport]
#         __parport_register_driver+0x39/0x1f4 [parport]
#         daisy_drv_init+0x31/0x4f [parport]
#         parport_bus_init+0x5d/0x7b [parport]
#         parport_default_proc_register+0x26/0x1000 [parport]
#         do_one_initcall+0xc2/0x1e0
#         do_init_module+0x50/0x1d4
#         load_module+0x1c2e/0x21b3
#         sys_init_module+0xef/0x117
#     
#     Supid says:
#      "Due to the new device model daisy driver will now try to find the
#       parallel ports while trying to register its driver so that it can bind
#       with them. Now, since daisy driver is loaded while parport bus is
#       initialising the list of parport is still empty and it tries to load
#       the lowlevel driver, which has an alias set to parport_pc, now causes
#       a deadlock"
#     
#     But I don't think the daisy driver should be loaded by the parport
#     initialization in the first place, so let's revert the whole change.
#     
#     If the daisy driver can just initialize separately on its own (like a
#     driver should), instead of hooking into the parport init sequence
#     directly, this issue probably would go away.
#     
#     Reported-and-bisected-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
#     Reported-by: Michal Kubecek <mkubecek@suse.cz>
#     Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
#     Cc: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/sh4-linux/bin/sh4-linux-gcc --version
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/sh4-linux/bin/sh4-linux-ld --version
# < git log --format=%s --max-count=1 a3ac7917b73070010c05b4485b8582a6c9cd69b6
# < make -s -j 10 ARCH=sh O=/kisskb/build/linus_polaris_defconfig_sh4 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/sh4-linux/bin/sh4-linux-  polaris_defconfig
# make -s -j 10 ARCH=sh O=/kisskb/build/linus_polaris_defconfig_sh4 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/sh4-linux/bin/sh4-linux-  
  Generating include/generated/machtypes.h
<stdin>:1478:2: warning: #warning syscall pidfd_send_signal not implemented [-Wcpp]
<stdin>:1481:2: warning: #warning syscall io_uring_setup not implemented [-Wcpp]
<stdin>:1484:2: warning: #warning syscall io_uring_enter not implemented [-Wcpp]
<stdin>:1487:2: warning: #warning syscall io_uring_register not implemented [-Wcpp]
In file included from /kisskb/src/arch/sh/math-emu/math.c:23:0:
/kisskb/src/include/math-emu/single.h:50:21: warning: "__BIG_ENDIAN" is not defined [-Wundef]
In file included from /kisskb/src/arch/sh/math-emu/math.c:24:0:
/kisskb/src/include/math-emu/double.h:59:21: warning: "__BIG_ENDIAN" is not defined [-Wundef]
/kisskb/src/arch/sh/math-emu/math.c:54:0: warning: "WRITE" redefined [enabled by default]
/kisskb/src/include/linux/kernel.h:40:0: note: this is the location of the previous definition
/kisskb/src/arch/sh/math-emu/math.c:55:0: warning: "READ" redefined [enabled by default]
/kisskb/src/include/linux/kernel.h:39:0: note: this is the location of the previous definition
/kisskb/src/arch/sh/math-emu/math.c: In function 'ffloat':
/kisskb/src/arch/sh/math-emu/math.c:294:3: warning: right shift count >= width of type [enabled by default]
/kisskb/src/arch/sh/math-emu/math.c:294:3: warning: right shift count >= width of type [enabled by default]
/kisskb/src/arch/sh/math-emu/math.c:296:3: warning: right shift count >= width of type [enabled by default]
/kisskb/src/arch/sh/math-emu/math.c:296:3: warning: right shift count >= width of type [enabled by default]
/kisskb/src/arch/sh/math-emu/math.c: In function 'ftrc':
/kisskb/src/arch/sh/math-emu/math.c:310:1: warning: left shift count >= width of type [enabled by default]
/kisskb/src/arch/sh/math-emu/math.c:310:1: warning: left shift count >= width of type [enabled by default]
/kisskb/src/arch/sh/math-emu/math.c:310:1: warning: left shift count >= width of type [enabled by default]
/kisskb/src/arch/sh/math-emu/math.c: At top level:
/kisskb/src/arch/sh/math-emu/math.c:505:12: warning: 'ieee_fpe_handler' defined but not used [-Wunused-function]
/kisskb/src/arch/sh/kernel/cpu/sh3/../../entry-common.S: Assembler messages:
/kisskb/src/arch/sh/kernel/cpu/sh3/../../entry-common.S:385: Warning: overflow in branch to syscall_exit_work; converted into longer instruction sequence
/kisskb/src/arch/sh/kernel/cpu/sh3/../../entry-common.S:388: 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:187:16: warning: 'old' 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:121:34: warning: 'levelspread[<Ue960>]' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/rcu/srcutree.c:88:6: note: 'levelspread[<Ue960>]' was declared here
/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:337:21: note: 'pdeo' was declared here
/kisskb/src/mm/mprotect.c: In function 'change_pte_range':
/kisskb/src/mm/mprotect.c:42:20: warning: unused variable 'mm' [-Wunused-variable]
/kisskb/src/net/ipv4/ip_output.c: In function '__ip_append_data':
/kisskb/src/include/linux/skbuff.h:1397:6: warning: 'extra_uref' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/net/ipv4/ip_output.c:885:14: note: 'extra_uref' was declared here
/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 *'
/kisskb/src/net/sunrpc/xprtsock.c: In function 'xs_stream_data_receive_workfn':
/kisskb/src/net/sunrpc/xprtsock.c:529:2: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/net/sunrpc/xprtsock.c:499:10: note: 'ret' was declared here
/kisskb/src/net/sunrpc/xprtsock.c:529:2: warning: 'read' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/net/sunrpc/xprtsock.c:498:15: note: 'read' was declared here
/kisskb/src/fs/fs_parser.c: In function 'fs_validate_description':
/kisskb/src/fs/fs_parser.c:413:6: warning: format '%lu' expects argument of type 'long unsigned int', but argument 3 has type 'int' [-Wformat]
  Kernel: arch/sh/boot/zImage is ready
Completed OK
# rm -rf /kisskb/build/linus_polaris_defconfig_sh4
# Build took: 0:00:55.302834