# git rev-parse -q --verify 950b07c14e8c59444e2359f15fd70ed5112e11a0^{commit}
950b07c14e8c59444e2359f15fd70ed5112e11a0
already have revision, skipping fetch
# git checkout -q -f -B kisskb 950b07c14e8c59444e2359f15fd70ed5112e11a0
# git clean -qxdf
# < git log -1
# commit 950b07c14e8c59444e2359f15fd70ed5112e11a0
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Sat Sep 7 14:25:54 2019 -0700
# 
#     Revert "x86/apic: Include the LDR when clearing out APIC registers"
#     
#     This reverts commit 558682b5291937a70748d36fd9ba757fb25b99ae.
#     
#     Chris Wilson reports that it breaks his CPU hotplug test scripts.  In
#     particular, it breaks offlining and then re-onlining the boot CPU, which
#     we treat specially (and the BIOS does too).
#     
#     The symptoms are that we can offline the CPU, but it then does not come
#     back online again:
#     
#         smpboot: CPU 0 is now offline
#         smpboot: Booting Node 0 Processor 0 APIC 0x0
#         smpboot: do_boot_cpu failed(-1) to wakeup CPU#0
#     
#     Thomas says he knows why it's broken (my personal suspicion: our magic
#     handling of the "cpu0_logical_apicid" thing), but for 5.3 the right fix
#     is to just revert it, since we've never touched the LDR bits before, and
#     it's not worth the risk to do anything else at this stage.
#     
#     [ Hotpluging of the boot CPU is special anyway, and should be off by
#       default. See the "BOOTPARAM_HOTPLUG_CPU0" config option and the
#       cpu0_hotplug kernel parameter.
#     
#       In general you should not do it, and it has various known limitations
#       (hibernate and suspend require the boot CPU, for example).
#     
#       But it should work, even if the boot CPU is special and needs careful
#       treatment       - Linus ]
#     
#     Link: https://lore.kernel.org/lkml/156785100521.13300.14461504732265570003@skylake-alporthouse-com/
#     Reported-by: Chris Wilson <chris@chris-wilson.co.uk>
#     Acked-by: Thomas Gleixner <tglx@linutronix.de>
#     Cc: Bandan Das <bsd@redhat.com>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux-gcc --version
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux-ld --version
# < git log --format=%s --max-count=1 950b07c14e8c59444e2359f15fd70ed5112e11a0
# < make -s -j 80 ARCH=mips O=/kisskb/build/linus_mips-defconfig_mips CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux-  defconfig
# make -s -j 80 ARCH=mips O=/kisskb/build/linus_mips-defconfig_mips CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux-  
/kisskb/src/arch/mips/vdso/Makefile:39: MIPS VDSO requires binutils >= 2.25
<stdin>:1511:2: warning: #warning syscall clone3 not implemented [-Wcpp]
/kisskb/src/arch/mips/vdso/Makefile:39: MIPS VDSO requires binutils >= 2.25
/kisskb/src/kernel/rcu/srcutree.c: In function 'init_srcu_struct_fields':
/kisskb/src/kernel/rcu/srcutree.c:140:32: warning: 'levelspread[<U1be0>]' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/rcu/srcutree.c:88:6: note: 'levelspread[<U1be0>]' was declared here
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:194:16: warning: 'old' 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:1852:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/base/regmap/regmap.c: In function 'regmap_raw_read':
/kisskb/src/drivers/base/regmap/regmap.c:2591:6: warning: 'ret' 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:338:21: note: 'pdeo' was declared here
/kisskb/src/net/bridge/br_netlink.c: In function 'br_afspec.isra.20':
/kisskb/src/net/bridge/br_netlink.c:648:7: warning: 'err' 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/net/core/devlink.c: In function 'devlink_fmsg_prepare_skb':
/kisskb/src/net/core/devlink.c:4443:6: 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:613:23: warning: 'errno' may be used uninitialized in this function [-Wuninitialized]
<stdin>:1511:2: warning: #warning syscall clone3 not implemented [-Wcpp]
/kisskb/src/arch/mips/vdso/Makefile:39: MIPS VDSO requires binutils >= 2.25
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:194:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized]
FIT description: Linux 5.3.0-rc7-g950b07c14e8c
Created:         Sun Sep  8 11:18:31 2019
 Image 0 (kernel@0)
  Description:  Linux 5.3.0-rc7-g950b07c14e8c
  Created:      Sun Sep  8 11:18:31 2019
  Type:         Kernel Image
  Compression:  gzip compressed
  Data Size:    4528986 Bytes = 4422.84 KiB = 4.32 MiB
  Architecture: MIPS
  OS:           Linux
  Load Address: 0x80100000
  Entry Point:  0x80862170
  Hash algo:    sha1
  Hash value:   a55d65077de29f8e3344a6ee6e625c6d6fef8dde
 Image 1 (fdt@boston)
  Description:  img,boston Device Tree
  Created:      Sun Sep  8 11:18:31 2019
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    3793 Bytes = 3.70 KiB = 0.00 MiB
  Architecture: MIPS
  Hash algo:    sha1
  Hash value:   4799f50d688573234da6e9d7701234d394759ef4
 Image 2 (fdt@ni169445)
  Description:  NI 169445 device tree
  Created:      Sun Sep  8 11:18:31 2019
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    1871 Bytes = 1.83 KiB = 0.00 MiB
  Architecture: MIPS
  Hash algo:    sha1
  Hash value:   51b89b31605ee62038c8468c429af091dfc75ec7
 Image 3 (fdt@ocelot_pcb123)
  Description:  MSCC Ocelot PCB123 Device Tree
  Created:      Sun Sep  8 11:18:31 2019
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    4615 Bytes = 4.51 KiB = 0.00 MiB
  Architecture: MIPS
  Hash algo:    sha1
  Hash value:   8754eadee600cac22c9c34884cd901aac7e95e8a
 Image 4 (fdt@ocelot_pcb120)
  Description:  MSCC Ocelot PCB120 Device Tree
  Created:      Sun Sep  8 11:18:31 2019
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    5174 Bytes = 5.05 KiB = 0.00 MiB
  Architecture: MIPS
  Hash algo:    sha1
  Hash value:   1ab7d0871c0a9345c6269fb491bf028224da8256
 Image 5 (fdt@xilfpga)
  Description:  MIPSfpga (xilfpga) Device Tree
  Created:      Sun Sep  8 11:18:31 2019
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    2708 Bytes = 2.64 KiB = 0.00 MiB
  Architecture: MIPS
  Hash algo:    sha1
  Hash value:   63d058b780f65e22da30f0a183433765f1807f1d
 Default Configuration: 'conf@default'
 Configuration 0 (conf@default)
  Description:  Generic Linux kernel
  Kernel:       kernel@0
 Configuration 1 (conf@boston)
  Description:  Boston Linux kernel
  Kernel:       kernel@0
  FDT:          fdt@boston
 Configuration 2 (conf@ni169445)
  Description:  NI 169445 Linux Kernel
  Kernel:       kernel@0
  FDT:          fdt@ni169445
 Configuration 3 (conf@ocelot_pcb123)
  Description:  Ocelot Linux kernel
  Kernel:       kernel@0
  FDT:          fdt@ocelot_pcb123
 Configuration 4 (conf@ocelot_pcb120)
  Description:  Ocelot Linux kernel
  Kernel:       kernel@0
  FDT:          fdt@ocelot_pcb120
 Configuration 5 (conf@xilfpga)
  Description:  MIPSfpga Linux kernel
  Kernel:       kernel@0
  FDT:          fdt@xilfpga
Completed OK
# rm -rf /kisskb/build/linus_mips-defconfig_mips
# Build took: 0:01:38.564163