# git rev-parse -q --verify fca7526b7d8910c6125cb1ebc3e78ccd5f50ec52^{commit}
fca7526b7d8910c6125cb1ebc3e78ccd5f50ec52
already have revision, skipping fetch
# git checkout -q -f -B kisskb fca7526b7d8910c6125cb1ebc3e78ccd5f50ec52
# git clean -qxdf
# < git log -1
# commit fca7526b7d8910c6125cb1ebc3e78ccd5f50ec52
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Tue Feb 20 12:16:47 2024 -0800
# 
#     drm/tests/drm_buddy: fix build failure on 32-bit targets
#     
#     Guenter Roeck reports that commit a64056bb5a32 ("drm/tests/drm_buddy:
#     add alloc_contiguous test") causes build failures on 32-bit targets:
#     
#      "This patch breaks the build on all 32-bit systems since it introduces
#       an unhandled direct 64-bit divide operation.
#     
#       ERROR: modpost: "__umoddi3" [drivers/gpu/drm/tests/drm_buddy_test.ko] undefined!
#       ERROR: modpost: "__moddi3" [drivers/gpu/drm/tests/drm_buddy_test.ko] undefined!"
#     
#     and the uses of 'u64' are all entirely pointless.  Yes, the arguments to
#     drm_buddy_init() and drm_buddy_alloc_blocks() are in fact of type 'u64',
#     but none of the values here are remotely relevant, and the compiler will
#     happily just do the type expansion.
#     
#     Of course, in a perfect world the compiler would also have just noticed
#     that all the values in question are tiny, and range analysis would have
#     shown that doing a 64-bit divide is pointless, but that is admittedly
#     expecting a fair amount of the compiler.
#     
#     IOW, we shouldn't write code that the compiler then has to notice is
#     unnecessarily complicated just to avoid extra work.  We do have fairly
#     high expectations of compilers, but kernel code should be reasonable to
#     begin with.
#     
#     It turns out that there are also other issues with this code: the KUnit
#     assertion messages have incorrect types in the format strings, but
#     that's a widely spread issue caused by the KUnit infrastructure not
#     having enabled format string verification.  We'll get that sorted out
#     separately.
#     
#     Reported-by: Guenter Roeck <linux@roeck-us.net>
#     Fixes: a64056bb5a32 ("drm/tests/drm_buddy: add alloc_contiguous test")
#     Link: https://lore.kernel.org/all/538327ff-8d34-41d5-a9ae-1a334744f5ae@roeck-us.net/
#     Cc: Matthew Auld <matthew.auld@intel.com>
#     Cc: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@amd.com>
#     Cc: Christian König <christian.koenig@amd.com>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-ld --version
# < git log --format=%s --max-count=1 fca7526b7d8910c6125cb1ebc3e78ccd5f50ec52
# make -s -j 160 ARCH=x86 O=/kisskb/build/linus_x86_64_defconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-  x86_64_defconfig
# < make -s -j 160 ARCH=x86 O=/kisskb/build/linus_x86_64_defconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-  help
# make -s -j 160 ARCH=x86 O=/kisskb/build/linus_x86_64_defconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-  olddefconfig
# make -s -j 160 ARCH=x86 O=/kisskb/build/linus_x86_64_defconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-  
Completed OK
# rm -rf /kisskb/build/linus_x86_64_defconfig_x86_64-gcc8
# Build took: 0:02:07.421544