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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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b7dca6dd1e
While descending directories, Kbuild produces objects for modules, but do not link final *.ko files; it is done in the modpost. To keep track of modules, Kbuild creates a *.mod file in $(MODVERDIR) for every module it is building. Some post-processing steps read the necessary information from *.mod files. This avoids descending into directories again. This mechanism was introduced in 2003 or so. Later, commit551559e13a("kbuild: implement modules.order") added modules.order. So, we can simply read it out to know all the modules with directory paths. This is easier than parsing the first line of *.mod files. $(MODVERDIR) has a flat directory structure, that is, *.mod files are named only with base names. This is based on the assumption that the module name is unique across the tree. This assumption is really fragile. Stephen Rothwell reported a race condition caused by a module name conflict: https://lkml.org/lkml/2019/5/13/991 In parallel building, two different threads could write to the same $(MODVERDIR)/*.mod simultaneously. Non-unique module names are the source of all kind of troubles, hence commit3a48a91901("kbuild: check uniqueness of module names") introduced a new checker script. However, it is still fragile in the build system point of view because this race happens before scripts/modules-check.sh is invoked. If it happens again, the modpost will emit unclear error messages. To fix this issue completely, create *.mod with full directory path so that two threads never attempt to write to the same file. $(MODVERDIR) is no longer needed. Since modules with directory paths are listed in modules.order, Kbuild is still able to find *.mod files without additional descending. I also killed cmd_secanalysis; scripts/mod/sumversion.c computes MD4 hash for modules with MODULE_VERSION(). When CONFIG_DEBUG_SECTION_MISMATCH=y, it occurs not only in the modpost stage, but also during directory descending, where sumversion.c may parse stale *.mod files. It would emit 'No such file or directory' warning when an object consisting a module is renamed, or when a single-obj module is turned into a multi-obj module or vice versa. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Nicolas Pitre <nico@fluxnic.net>
148 lines
4.7 KiB
Bash
Executable File
148 lines
4.7 KiB
Bash
Executable File
#!/bin/sh
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#
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# Output a simple RPM spec file.
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# This version assumes a minimum of RPM 4.0.3.
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#
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# The only gothic bit here is redefining install_post to avoid
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# stripping the symbols from files in the kernel which we want
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#
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# Patched for non-x86 by Opencon (L) 2002 <opencon@rio.skydome.net>
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#
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# how we were called determines which rpms we build and how we build them
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if [ "$1" = prebuilt ]; then
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S=DEL
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MAKE="$MAKE -f $srctree/Makefile"
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else
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S=
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fi
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if grep -q CONFIG_MODULES=y .config; then
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M=
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else
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M=DEL
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fi
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if grep -q CONFIG_DRM=y .config; then
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PROVIDES=kernel-drm
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fi
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PROVIDES="$PROVIDES kernel-$KERNELRELEASE"
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__KERNELRELEASE=$(echo $KERNELRELEASE | sed -e "s/-/_/g")
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EXCLUDES="$RCS_TAR_IGNORE --exclude=*vmlinux* --exclude=*.mod \
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--exclude=*.o --exclude=*.ko --exclude=*.cmd --exclude=Documentation \
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--exclude=.config.old --exclude=.missing-syscalls.d --exclude=*.s"
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# We can label the here-doc lines for conditional output to the spec file
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#
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# Labels:
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# $S: this line is enabled only when building source package
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# $M: this line is enabled only when CONFIG_MODULES is enabled
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sed -e '/^DEL/d' -e 's/^\t*//' <<EOF
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Name: kernel
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Summary: The Linux Kernel
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Version: $__KERNELRELEASE
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Release: $(cat .version 2>/dev/null || echo 1)
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License: GPL
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Group: System Environment/Kernel
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Vendor: The Linux Community
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URL: http://www.kernel.org
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$S Source: kernel-$__KERNELRELEASE.tar.gz
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Provides: $PROVIDES
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%define __spec_install_post /usr/lib/rpm/brp-compress || :
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%define debug_package %{nil}
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%description
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The Linux Kernel, the operating system core itself
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%package headers
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Summary: Header files for the Linux kernel for use by glibc
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Group: Development/System
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Obsoletes: kernel-headers
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Provides: kernel-headers = %{version}
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%description headers
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Kernel-headers includes the C header files that specify the interface
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between the Linux kernel and userspace libraries and programs. The
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header files define structures and constants that are needed for
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building most standard programs and are also needed for rebuilding the
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glibc package.
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$S$M %package devel
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$S$M Summary: Development package for building kernel modules to match the $__KERNELRELEASE kernel
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$S$M Group: System Environment/Kernel
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$S$M AutoReqProv: no
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$S$M %description -n kernel-devel
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$S$M This package provides kernel headers and makefiles sufficient to build modules
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$S$M against the $__KERNELRELEASE kernel package.
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$S$M
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$S %prep
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$S %setup -q
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$S
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$S %build
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$S $MAKE %{?_smp_mflags} KBUILD_BUILD_VERSION=%{release}
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$S
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%install
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mkdir -p %{buildroot}/boot
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%ifarch ia64
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mkdir -p %{buildroot}/boot/efi
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cp \$($MAKE image_name) %{buildroot}/boot/efi/vmlinuz-$KERNELRELEASE
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ln -s efi/vmlinuz-$KERNELRELEASE %{buildroot}/boot/
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%else
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cp \$($MAKE image_name) %{buildroot}/boot/vmlinuz-$KERNELRELEASE
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%endif
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$M $MAKE %{?_smp_mflags} INSTALL_MOD_PATH=%{buildroot} modules_install
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$MAKE %{?_smp_mflags} INSTALL_HDR_PATH=%{buildroot}/usr headers_install
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cp System.map %{buildroot}/boot/System.map-$KERNELRELEASE
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cp .config %{buildroot}/boot/config-$KERNELRELEASE
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bzip2 -9 --keep vmlinux
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mv vmlinux.bz2 %{buildroot}/boot/vmlinux-$KERNELRELEASE.bz2
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$S$M rm -f %{buildroot}/lib/modules/$KERNELRELEASE/build
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$S$M rm -f %{buildroot}/lib/modules/$KERNELRELEASE/source
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$S$M mkdir -p %{buildroot}/usr/src/kernels/$KERNELRELEASE
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$S$M tar cf - $EXCLUDES . | tar xf - -C %{buildroot}/usr/src/kernels/$KERNELRELEASE
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$S$M cd %{buildroot}/lib/modules/$KERNELRELEASE
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$S$M ln -sf /usr/src/kernels/$KERNELRELEASE build
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$S$M ln -sf /usr/src/kernels/$KERNELRELEASE source
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%clean
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rm -rf %{buildroot}
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%post
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if [ -x /sbin/installkernel -a -r /boot/vmlinuz-$KERNELRELEASE -a -r /boot/System.map-$KERNELRELEASE ]; then
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cp /boot/vmlinuz-$KERNELRELEASE /boot/.vmlinuz-$KERNELRELEASE-rpm
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cp /boot/System.map-$KERNELRELEASE /boot/.System.map-$KERNELRELEASE-rpm
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rm -f /boot/vmlinuz-$KERNELRELEASE /boot/System.map-$KERNELRELEASE
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/sbin/installkernel $KERNELRELEASE /boot/.vmlinuz-$KERNELRELEASE-rpm /boot/.System.map-$KERNELRELEASE-rpm
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rm -f /boot/.vmlinuz-$KERNELRELEASE-rpm /boot/.System.map-$KERNELRELEASE-rpm
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fi
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%preun
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if [ -x /sbin/new-kernel-pkg ]; then
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new-kernel-pkg --remove $KERNELRELEASE --rminitrd --initrdfile=/boot/initramfs-$KERNELRELEASE.img
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elif [ -x /usr/bin/kernel-install ]; then
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kernel-install remove $KERNELRELEASE
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fi
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%postun
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if [ -x /sbin/update-bootloader ]; then
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/sbin/update-bootloader --remove $KERNELRELEASE
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fi
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%files
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%defattr (-, root, root)
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$M /lib/modules/$KERNELRELEASE
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$M %exclude /lib/modules/$KERNELRELEASE/build
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$M %exclude /lib/modules/$KERNELRELEASE/source
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/boot/*
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%files headers
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%defattr (-, root, root)
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/usr/include
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$S$M
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$S$M %files devel
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$S$M %defattr (-, root, root)
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$S$M /usr/src/kernels/$KERNELRELEASE
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$S$M /lib/modules/$KERNELRELEASE/build
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$S$M /lib/modules/$KERNELRELEASE/source
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EOF
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