# git rev-parse -q --verify a9f675f950a07d5c1dbcbb97aabac56f5ed085e3^{commit}
a9f675f950a07d5c1dbcbb97aabac56f5ed085e3
already have revision, skipping fetch
# git checkout -q -f -B kisskb a9f675f950a07d5c1dbcbb97aabac56f5ed085e3
# git clean -qxdf
# < git log -1
# commit a9f675f950a07d5c1dbcbb97aabac56f5ed085e3
# Author: Milton Miller <miltonm@us.ibm.com>
# Date:   Thu Jul 16 09:37:04 2020 +1000
# 
#     powerpc/vdso: Fix vdso cpu truncation
#     
#     The code in vdso_cpu_init that exposes the cpu and numa node to
#     userspace via SPRG_VDSO incorrctly masks the cpu to 12 bits. This means
#     that any kernel running on a box with more than 4096 threads (NR_CPUS
#     advertises a limit of of 8192 cpus) would expose userspace to two cpu
#     contexts running at the same time with the same cpu number.
#     
#     Note: I'm not aware of any distro shipping a kernel with support for more
#     than 4096 threads today, nor of any system image that currently exceeds
#     4096 threads. Found via code browsing.
#     
#     Fixes: 18ad51dd342a7eb09dbcd059d0b451b616d4dafc ("powerpc: Add VDSO version of getcpu")
#     Signed-off-by: Milton Miller <miltonm@us.ibm.com>
#     Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20200715233704.1352257-1-anton@ozlabs.org
# < /opt/cross/kisskb/br-mipsel-o32-full-2016.08-613-ge98b4dd/bin/mipsel-linux-gcc --version
# < /opt/cross/kisskb/br-mipsel-o32-full-2016.08-613-ge98b4dd/bin/mipsel-linux-ld --version
# < git log --format=%s --max-count=1 a9f675f950a07d5c1dbcbb97aabac56f5ed085e3
# < make -s -j 24 ARCH=mips O=/kisskb/build/powerpc-next_mips-defconfig_mipsel CROSS_COMPILE=/opt/cross/kisskb/br-mipsel-o32-full-2016.08-613-ge98b4dd/bin/mipsel-linux-  defconfig
# < make -s -j 24 ARCH=mips O=/kisskb/build/powerpc-next_mips-defconfig_mipsel CROSS_COMPILE=/opt/cross/kisskb/br-mipsel-o32-full-2016.08-613-ge98b4dd/bin/mipsel-linux-  help
# make -s -j 24 ARCH=mips O=/kisskb/build/powerpc-next_mips-defconfig_mipsel CROSS_COMPILE=/opt/cross/kisskb/br-mipsel-o32-full-2016.08-613-ge98b4dd/bin/mipsel-linux-  olddefconfig
# make -s -j 24 ARCH=mips O=/kisskb/build/powerpc-next_mips-defconfig_mipsel CROSS_COMPILE=/opt/cross/kisskb/br-mipsel-o32-full-2016.08-613-ge98b4dd/bin/mipsel-linux-  
FIT description: Linux 5.8.0-rc2-ga9f675f950a0
Created:         Thu Jul 16 19:21:39 2020
 Image 0 (kernel@0)
  Description:  Linux 5.8.0-rc2-ga9f675f950a0
  Created:      Thu Jul 16 19:21:39 2020
  Type:         Kernel Image
  Compression:  gzip compressed
  Data Size:    4993924 Bytes = 4876.88 KiB = 4.76 MiB
  Architecture: MIPS
  OS:           Linux
  Load Address: 0x80100000
  Entry Point:  0x809319e0
  Hash algo:    sha1
  Hash value:   a56ab213a5f2fa45cf5666e1f61225185d984ede
 Image 1 (fdt@boston)
  Description:  img,boston Device Tree
  Created:      Thu Jul 16 19:21:39 2020
  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:      Thu Jul 16 19:21:39 2020
  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:      Thu Jul 16 19:21:39 2020
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    4639 Bytes = 4.53 KiB = 0.00 MiB
  Architecture: MIPS
  Hash algo:    sha1
  Hash value:   be2724f58b66c316a61da7c11ced633f4e7e86c7
 Image 4 (fdt@ocelot_pcb120)
  Description:  MSCC Ocelot PCB120 Device Tree
  Created:      Thu Jul 16 19:21:39 2020
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    5198 Bytes = 5.08 KiB = 0.00 MiB
  Architecture: MIPS
  Hash algo:    sha1
  Hash value:   7556b1594bd7ab9e3b3fa939d8e3e03ae58fa180
 Image 5 (fdt@xilfpga)
  Description:  MIPSfpga (xilfpga) Device Tree
  Created:      Thu Jul 16 19:21:39 2020
  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/powerpc-next_mips-defconfig_mipsel
# Build took: 0:02:13.251302