# git rev-parse -q --verify 6830fcf476286380beeac027eaa2718cb574438a^{commit}
6830fcf476286380beeac027eaa2718cb574438a
already have revision, skipping fetch
# git checkout -q -f -B kisskb 6830fcf476286380beeac027eaa2718cb574438a
# git clean -qxdf
# < git log -1
# commit 6830fcf476286380beeac027eaa2718cb574438a
# Author: Nicholas Piggin <npiggin@gmail.com>
# Date:   Tue May 22 09:00:00 2018 +1000
# 
#     powerpc/64s: Add support for a store forwarding barrier at kernel entry/exit
#     
#     commit a048a07d7f4535baa4cbad6bc024f175317ab938 upstream.
#     
#     On some CPUs we can prevent a vulnerability related to store-to-load
#     forwarding by preventing store forwarding between privilege domains,
#     by inserting a barrier in kernel entry and exit paths.
#     
#     This is known to be the case on at least Power7, Power8 and Power9
#     powerpc CPUs.
#     
#     Barriers must be inserted generally before the first load after moving
#     to a higher privilege, and after the last store before moving to a
#     lower privilege, HV and PR privilege transitions must be protected.
#     
#     Barriers are added as patch sections, with all kernel/hypervisor entry
#     points patched, and the exit points to lower privilge levels patched
#     similarly to the RFI flush patching.
#     
#     Firmware advertisement is not implemented yet, so CPU flush types
#     are hard coded.
#     
#     Thanks to Michal Suchánek for bug fixes and review.
#     
#     Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
#     Signed-off-by: Mauricio Faria de Oliveira <mauricfo@linux.vnet.ibm.com>
#     Signed-off-by: Michael Neuling <mikey@neuling.org>
#     Signed-off-by: Michal Suchánek <msuchanek@suse.de>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/br-mipsel-o32-full-2016.08-613-ge98b4dd/bin/mipsel-linux-gcc --version
# < git log --format=%s --max-count=1 6830fcf476286380beeac027eaa2718cb574438a
# < make -s -j 10 ARCH=mips O=/kisskb/build/mpe_mips-defconfig_mipsel CROSS_COMPILE=/opt/cross/kisskb/br-mipsel-o32-full-2016.08-613-ge98b4dd/bin/mipsel-linux-  defconfig
# make -s -j 10 ARCH=mips O=/kisskb/build/mpe_mips-defconfig_mipsel CROSS_COMPILE=/opt/cross/kisskb/br-mipsel-o32-full-2016.08-613-ge98b4dd/bin/mipsel-linux-  
FIT description: Linux 4.16.10-g6830fcf
Created:         Tue May 22 18:10:22 2018
 Image 0 (kernel@0)
  Description:  Linux 4.16.10-g6830fcf
  Created:      Tue May 22 18:10:22 2018
  Type:         Kernel Image
  Compression:  gzip compressed
  Data Size:    4404368 Bytes = 4301.14 kB = 4.20 MB
  Architecture: MIPS
  OS:           Linux
  Load Address: 0x80100000
  Entry Point:  0x8087b660
  Hash algo:    sha1
  Hash value:   18b9cc60b5f909da9d677665d3bde459e72d9809
 Image 1 (fdt@boston)
  Description:  img,boston Device Tree
  Created:      Tue May 22 18:10:22 2018
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    3602 Bytes = 3.52 kB = 0.00 MB
  Architecture: MIPS
  Hash algo:    sha1
  Hash value:   dabc84017c5ea1c23fdb5a4b25d185bdf81faa6a
 Image 2 (fdt@ni169445)
  Description:  NI 169445 device tree
  Created:      Tue May 22 18:10:22 2018
  Type:         Flat Device Tree
  Compression:  uncompressed
  Data Size:    1871 Bytes = 1.83 kB = 0.00 MB
  Architecture: MIPS
  Hash algo:    sha1
  Hash value:   51b89b31605ee62038c8468c429af091dfc75ec7
 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
Completed OK
# rm -rf /kisskb/build/mpe_mips-defconfig_mipsel
# Build took: 0:03:28.566263