Clang 15: fs/zfs/icp/core/kcf_sched.c:1277:14: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]

[formula-spectre]

System information

Type	Version/Name
Distribution Name	Gentoo
Distribution Version	2.9
Kernel Version	5.15.72-xanmod
Architecture	amd64
OpenZFS Version	2.1.6

Describe the problem you're observing

when building a kernel with zfs built in kernel, I encounter the following error:

CC      fs/zfs/icp/core/kcf_sched.o  
fs/zfs/icp/core/kcf_sched.c:1277:14: error: a function  
      declaration without a prototype is deprecated in all versions of C  
      [-Werror,-Wstrict-prototypes]  
kcfpool_alloc()  
             ^  
              void  
1 error generated.  
make[3]: *** [scripts/Makefile.build:289: fs/zfs/icp/core/kcf_sched.o] Error 1  
make[2]: *** [scripts/Makefile.build:552: fs/zfs/icp] Error 2  
make[1]: *** [scripts/Makefile.build:552: fs/zfs] Error 2  
make: *** [Makefile:1899: fs] Error 2

Describe how to reproduce the problem

using LLVM toolchain version 15:

env EXTRA_ECONF='--enable-linux-builtin' ebuild /var/db/repos/gentoo/sys-fs/zfs-kmod/zfs-kmod-2.1.6.ebuild clean configure
cd /var/tmp/portage/sys-fs/zfs-kmod-2.1.6/work/zfs-2.1.6/ && ./copy-builtin /usr/src/linux

enable zfs in make *config

make CC=clang LLVM=1 LLVM_IAS=1 -j`nproc`

Include any warning/errors/backtraces from the system logs

 * zfs-2.1.6.tar.gz BLAKE2B SHA512 size ;-) ...                          [ ok ]
 * You have virtual/dist-kernel installed, but
 * USE="dist-kernel" is not enabled for sys-fs/zfs-kmod
 * It's recommended to globally enable dist-kernel USE flag
 * to auto-trigger initrd rebuilds with kernel updates
 * Determining the location of the kernel source code
 * Found kernel source directory:
 *     /usr/src/linux
 * Found sources for kernel version:
 *     5.15.72-xanmod1
 * Checking for suitable kernel configuration options ...
 [ ok ]
>>> Unpacking source...
>>> Unpacking zfs-2.1.6.tar.gz to /var/tmp/portage/sys-fs/zfs-kmod-2.1.6/work
>>> Source unpacked in /var/tmp/portage/sys-fs/zfs-kmod-2.1.6/work
>>> Preparing source in /var/tmp/portage/sys-fs/zfs-kmod-2.1.6/work/zfs-2.1.6 ...
 * Applying zfs-kmod-2.1.6-fgrep.patch ...
 [ ok ]
 * Running eautoreconf in '/var/tmp/portage/sys-fs/zfs-kmod-2.1.6/work/zfs-2.1.6' ...
 * Running 'libtoolize --install --copy --force --automake' ...
 [ ok ]
 * Running 'aclocal -I config --system-acdir=/var/tmp/portage/sys-fs/zfs-kmod-2.1.6/temp/aclocal' ...
 [ ok ]
 * Running 'autoconf --force' ...
 [ ok ]
 * Running 'autoheader' ...
 [ ok ]
 * Running 'automake --add-missing --copy --foreign --force-missing' ...
 [ ok ]
 * Running elibtoolize in: zfs-2.1.6/
 * Running elibtoolize in: zfs-2.1.6/config/
 *   Applying portage/1.2.0 patch ...
 *   Applying sed/1.5.6 patch ...
 *   Applying as-needed/2.4.3 patch ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/sys-fs/zfs-kmod-2.1.6/work/zfs-2.1.6 ... * strip-flags: CFLAGS: changed '-flto=thin -O3 -pipe -mllvm -polly -mllvm -polly-vectorizer=stripmine' to '-pipe -O2'
 * strip-flags: CXXFLAGS: changed '-flto=thin -O3 -pipe -mllvm -polly -mllvm -polly-vectorizer=stripmine' to '-pipe -O2'
 * strip-flags: FFLAGS: changed '-flto=thin -O3 -pipe -mllvm -polly -mllvm -polly-vectorizer=stripmine' to '-pipe -O2'
 * strip-flags: FCFLAGS: changed '-flto=thin -O3 -pipe -mllvm -polly -mllvm -polly-vectorizer=stripmine' to '-pipe -O2'
 * econf: updating zfs-2.1.6/config.sub with /usr/share/gnuconfig/config.sub
 * econf: updating zfs-2.1.6/config.guess with /usr/share/gnuconfig/config.guess
 * econf: updating zfs-2.1.6/config/config.sub with /usr/share/gnuconfig/config.sub * econf: updating zfs-2.1.6/config/config.guess with /usr/share/gnuconfig/config.guess
./configure --prefix=/usr --build=x86_64-gentoo-linux-musl --host=x86_64-gentoo-linux-musl --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc --localstatedir=/var/lib --disable-dependency-tracking --disable-silent-rules --docdir=/usr/share/doc/zfs-kmod-2.1.6 --htmldir=/usr/share/doc/zfs-kmod-2.1.6/html --with-sysroot=/ --libdir=/usr/lib HOSTCC=x86_64-gentoo-linux-musl-clang --bindir=/bin --sbindir=/sbin --with-config=kernel --with-linux=/usr/src/linux --with-linux-obj=/usr/src/linux --disable-debug --enable-linux-builtin
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checking dependency style of x86_64-gentoo-linux-musl-clang... none
checking whether to build with code coverage support... no
checking how to create a pax tar archive... gnutar
checking zfs author... OpenZFS
checking zfs license... CDDL
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checking for shared library run path origin... done
checking 32-bit host C ABI... no
checking for the common suffixes of directories in the library search path... lib64,lib64
checking zfs config... kernel
checking the number of available CPUs... 4
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checking for system type (linux-musl)... Linux
checking for python3... python3
checking for python version... 3.10
checking for python platform... linux
checking for GNU default python prefix... ${prefix}
checking for GNU default python exec_prefix... ${exec_prefix}
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checking for Python library path... -L/usr/lib -lpython3.10
checking for Python site-packages path... /usr/lib/python3.10/site-packages
checking python extra libraries... -ldl  -lm -lm
checking python extra linking flags... -Xlinker -export-dynamic
checking consistency of all components of python development environment... yes
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checking whether to enable pyzfs: ... no
checking for sed --in-place... --in-place
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checking kernel source and build directories... done
checking kernel source directory... /usr/src/linux
checking kernel build directory... /usr/src/linux
checking kernel source version... 5.15.72-xanmod1
checking for kernel config option compatibility... done
checking whether CONFIG_MODULES is defined... not needed
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checking whether CONFIG_ZLIB_DEFLATE is defined... yes
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checking kernel file name for module symbols... NONE
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checking whether ktime_get_coarse_real_ts64() exists... yes
checking whether ktime_get_raw_ts64() exists... yes
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checking whether dequeue_signal() takes 4 arguments... no
checking whether ZERO_PAGE() is GPL-only... no
checking whether __copy_from_user_inatomic is available... yes
checking os distribution... gentoo
checking default package type... tgz
checking default init directory... /etc/init.d
checking default init script type and shell... openrc:/sbin/openrc-run
checking default nfs server init script... nfs
checking default init config directory... /etc/conf.d
checking whether initramfs-tools is available... yes
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config.status: executing depfiles commands
config.status: executing libtool commands
config.status: executing po-directories commands
>>> Source configured.

don't know how relevant this is. should've reported everything, searched for other closed/open issues and found none, hope I did not blind it!

[AttilaFueloep]

This is already fixed in 2.1.7 staging and this code is gone in master.

[szubersk]

@formula-spectre would you like to give the https://github.com/openzfs/zfs/tree/zfs-2.1.7-staging branch a try to confirm if the problem has been solved for you?

[RinCat]

@formula-spectre would you like to give the https://github.com/openzfs/zfs/tree/zfs-2.1.7-staging branch a try to confirm if the problem has been solved for you?

Tested with 5.19.17 and clang 15, and the issue is solved.