# git rev-parse -q --verify af3e9579ecfbe1796334bb25a2f0a6437983673a^{commit}
# git fetch -q -n -f git://fs.ozlabs.ibm.com/kernel/linus master
# git rev-parse -q --verify af3e9579ecfbe1796334bb25a2f0a6437983673a^{commit}
af3e9579ecfbe1796334bb25a2f0a6437983673a
# git checkout -q -f -B kisskb af3e9579ecfbe1796334bb25a2f0a6437983673a
# git clean -qxdf
# < git log -1
# commit af3e9579ecfbe1796334bb25a2f0a6437983673a
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Sat Aug 6 13:24:56 2022 -0700
# 
#     Revert "iommu/dma: Add config for PCI SAC address trick"
#     
#     This reverts commit 4bf7fda4dce22214c70c49960b1b6438e6260b67.
#     
#     It turns out that it was hopelessly naive to think that this would work,
#     considering that we've always done this.  The first machine I actually
#     tested this on broke at bootup, getting to
#     
#         Reached target cryptsetup.target - Local Encrypted Volumes.
#     
#     and then hanging.  It's unclear what actually fails, since there's a lot
#     else going on around that time (eg amdgpu probing also happens around
#     that same time, but it could be some other random init thing that didn't
#     complete earlier and just caused the boot to hang at that point).
#     
#     The expectations that we should default to some unsafe and untested mode
#     seems entirely unfounded, and the belief that this wouldn't affect
#     modern systems is clearly entirely false.  The machine in question is
#     about two years old, so it's not exactly shiny, but it's also not some
#     dusty old museum piece PDP-11 in a closet.
#     
#     Cc: Robin Murphy <robin.murphy@arm.com>
#     Cc: Christoph Hellwig <hch@lst.de>
#     Cc: John Garry <john.garry@huawei.com>
#     Cc: Joerg Roedel <jroedel@suse.de>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/aarch64-linux/bin/aarch64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/aarch64-linux/bin/aarch64-linux-ld --version
# < git log --format=%s --max-count=1 af3e9579ecfbe1796334bb25a2f0a6437983673a
# < make -s -j 32 ARCH=arm64 O=/kisskb/build/linus-rand_arm64-randconfig_arm64-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/aarch64-linux/bin/aarch64-linux-  randconfig
# Added to kconfig CONFIG_PREVENT_FIRMWARE_BUILD=y
# < make -s -j 32 ARCH=arm64 O=/kisskb/build/linus-rand_arm64-randconfig_arm64-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/aarch64-linux/bin/aarch64-linux-  help
# make -s -j 32 ARCH=arm64 O=/kisskb/build/linus-rand_arm64-randconfig_arm64-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/aarch64-linux/bin/aarch64-linux-  olddefconfig
.config:6132:warning: override: reassigning to symbol PREVENT_FIRMWARE_BUILD
# make -s -j 32 ARCH=arm64 O=/kisskb/build/linus-rand_arm64-randconfig_arm64-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/aarch64-linux/bin/aarch64-linux-  
In file included from <command-line>:0:0:
In function 'kvm_vm_ioctl_set_device_addr.isra.50',
    inlined from 'kvm_arch_vm_ioctl' at /kisskb/src/arch/arm64/kvm/arm.c:1454:10:
/kisskb/src/include/linux/compiler_types.h:354:38: error: call to '__compiletime_assert_563' declared with attribute error: FIELD_GET: mask is not constant
  _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
                                      ^
/kisskb/src/include/linux/compiler_types.h:335:4: note: in definition of macro '__compiletime_assert'
    prefix ## suffix();    \
    ^
/kisskb/src/include/linux/compiler_types.h:354:2: note: in expansion of macro '_compiletime_assert'
  _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
  ^
/kisskb/src/include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
 #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
                                     ^
/kisskb/src/include/linux/bitfield.h:65:3: note: in expansion of macro 'BUILD_BUG_ON_MSG'
   BUILD_BUG_ON_MSG(!__builtin_constant_p(_mask),  \
   ^
/kisskb/src/include/linux/bitfield.h:128:3: note: in expansion of macro '__BF_FIELD_CHECK'
   __BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: "); \
   ^
/kisskb/src/arch/arm64/kvm/arm.c:1423:10: note: in expansion of macro 'FIELD_GET'
  switch (FIELD_GET(KVM_ARM_DEVICE_ID_MASK, dev_addr->id)) {
          ^
make[3]: *** [/kisskb/src/scripts/Makefile.build:249: arch/arm64/kvm/arm.o] Error 1
make[3]: *** Waiting for unfinished jobs....
make[2]: *** [/kisskb/src/scripts/Makefile.build:466: arch/arm64/kvm] Error 2
make[1]: *** [/kisskb/src/Makefile:1844: arch/arm64] Error 2
make[1]: *** Waiting for unfinished jobs....
make: *** [Makefile:219: __sub-make] Error 2
Command 'make -s -j 32 ARCH=arm64 O=/kisskb/build/linus-rand_arm64-randconfig_arm64-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/aarch64-linux/bin/aarch64-linux-  ' returned non-zero exit status 2
# rm -rf /kisskb/build/linus-rand_arm64-randconfig_arm64-gcc5
# Build took: 0:03:04.202688