# git rev-parse -q --verify 1a6d80ff2419e8ad627b4bf4775a8b4c70af535d^{commit}
# git fetch -q -n -f git://fs.ozlabs.ibm.com/kernel/linus master
# git rev-parse -q --verify 1a6d80ff2419e8ad627b4bf4775a8b4c70af535d^{commit}
1a6d80ff2419e8ad627b4bf4775a8b4c70af535d
# git checkout -q -f -B kisskb 1a6d80ff2419e8ad627b4bf4775a8b4c70af535d
# git clean -qxdf
# < git log -1
# commit 1a6d80ff2419e8ad627b4bf4775a8b4c70af535d
# Merge: 97d8cc20085f 3eb9cdffb397
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Thu Aug 26 11:26:00 2021 -0700
# 
#     Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
#     
#     Pull arm64 fix from Will Deacon:
#      "We received a report this week that the generic version of
#       pfn_valid(), which we switched to this merge window in 16c9afc77660
#       ("arm64/mm: drop HAVE_ARCH_PFN_VALID"), interacts badly with
#       dma_map_resource() due to the following check:
#     
#             /* Don't allow RAM to be mapped */
#             if (WARN_ON_ONCE(pfn_valid(PHYS_PFN(phys_addr))))
#                     return DMA_MAPPING_ERROR;
#     
#       Since the ongoing saga to determine the semantics of pfn_valid() is
#       unlikely to be resolved this week (does it indicate valid memory, or
#       just the presence of a struct page, or whether that struct page has
#       been initialised?), just revert back to our old version of pfn_valid()
#       for 5.14.
#     
#       Summary:
#     
#        - Fix dma_map_resource() by reverting back to old pfn_valid() code"
#     
#     * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
#       Partially revert "arm64/mm: drop HAVE_ARCH_PFN_VALID"
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/x86_64-linux/bin/x86_64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/x86_64-linux/bin/x86_64-linux-ld --version
# < git log --format=%s --max-count=1 1a6d80ff2419e8ad627b4bf4775a8b4c70af535d
# < make -s -j 80 ARCH=x86_64 O=/kisskb/build/linus-rand_x86_64-randconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/x86_64-linux/bin/x86_64-linux-  randconfig
# Added to kconfig CONFIG_STANDALONE=y
# Added to kconfig CONFIG_PREVENT_FIRMWARE_BUILD=y
# Added to kconfig CONFIG_CC_STACKPROTECTOR_STRONG=n
# Added to kconfig CONFIG_GCC_PLUGINS=n
# Added to kconfig CONFIG_GCC_PLUGIN_CYC_COMPLEXITY=n
# Added to kconfig CONFIG_GCC_PLUGIN_SANCOV=n
# Added to kconfig CONFIG_GCC_PLUGIN_LATENT_ENTROPY=n
# Added to kconfig CONFIG_BPF_PRELOAD=n
# Added to kconfig 
# < make -s -j 80 ARCH=x86_64 O=/kisskb/build/linus-rand_x86_64-randconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/x86_64-linux/bin/x86_64-linux-  help
# make -s -j 80 ARCH=x86_64 O=/kisskb/build/linus-rand_x86_64-randconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/x86_64-linux/bin/x86_64-linux-  olddefconfig
.config:5291:warning: override: reassigning to symbol PREVENT_FIRMWARE_BUILD
.config:5296:warning: override: reassigning to symbol GCC_PLUGIN_LATENT_ENTROPY
# make -s -j 80 ARCH=x86_64 O=/kisskb/build/linus-rand_x86_64-randconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/x86_64-linux/bin/x86_64-linux-  
Completed OK
# rm -rf /kisskb/build/linus-rand_x86_64-randconfig_x86_64-gcc8
# Build took: 0:11:09.290757