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2018-07-28builddeb: Change architecture detection fallback to use dpkg-architectureBen Hutchings1-2/+2
We currently use dpkg --print-architecture, which reports the architecture of the build machine. We can make a better guess than this by asking dpkg-architecture what the host architecture, i.e. the default architecture for building packages, is. This is sensitive to environment variables such as CC and DEB_HOST_ARCH, which should already be set in a cross-build environment. Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2018-07-28builddeb: Skip architecture detection when KBUILD_DEBARCH is setBen Hutchings1-3/+6
If KBUILD_DEBARCH is set then we will not use the result of architecture detection, and we may also warn unnecessarily. Move the check for KBUILD_DEBARCH further up to avoid this. Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2018-07-28kbuild: do not redirect the first prerequisite for filechkMasahiro Yamada5-7/+7
Currently, filechk unconditionally opens the first prerequisite and redirects it as the stdin of a filechk_* rule. Hence, every target using $(call filechk,...) must list something as the first prerequisite even if it is unneeded. '< $<' is actually unneeded in most cases. Each rule can explicitly adds it if necessary. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2018-07-28ARM: at91: remove unused duplicated filechk_offsetsMasahiro Yamada1-25/+0
The filechk_offsets in arch/arm/mach-at91/Makefile is never used because it is always overridden by the equivalent one in scripts/Makefile.lib Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-07-21kbuild: if_changed: document single use per target limitationDirk Gouders1-0/+6
Users of if_changed could easily feel invited to use it to divide a recipe into parts like: a: prereq FORCE $(call if_changed,do_a) $(call if_changed,do_b) But this is problematic, because if_changed should not be used more than once per target: in the above example, if_changed stores the command-line of the given command in .a.cmd and when a is up-to-date with respect to prereq, the file .a.cmd contains the command-line for the last command executed, i.e. do_b. When the recipe is then executed again, without any change of prerequisites, the command-line check for do_a will fail, do_a will be executed and stored in .a.cmd. The next check, however, will still see the old content (the file isn't re-read) and if_changed will skip do_b, because the command-line test will not recognize a change. On the next execution of the recipe the roles will flip: do_a is OK but do_b not and it will be executed. And so on... Signed-off-by: Dirk Gouders <dirk@gouders.net> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2018-07-19kbuild: buildtar: add arm64 supportOlof Johansson1-0/+8
Make 'make tar-pkg' work on arm64. Cc: Will Deacon <will.deacon@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Olof Johansson <olof@lixom.net> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2018-07-19kbuild: buildtar: remove crufty vax piecesOlof Johansson1-4/+0
ARCH=vax isn't in mainline; it can be added back if/when it shows up. Signed-off-by: Olof Johansson <olof@lixom.net> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2018-07-19kbuild: change ld_flags to contain LDFLAGS_$(@F)Masahiro Yamada2-4/+4
Put $(LDFLAGS_$(@F)) into ld_flags so that $(LDFLAGS_pcap.o) and $(LDFLAGS_vde.o) in arch/um/drivers/Makefile are absorbed. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
2018-07-19kbuild: replace $(LDFLAGS) $(ldflags-y) with $(ld_flags)Masahiro Yamada1-2/+1
$(LDFLAGS) $(ldflags-y) is equivalent to $(ld_flags). Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
2018-07-19kbuild: remove redundant LDFLAGS clearing in arch/*/MakefileMasahiro Yamada3-5/+0
Since commit ce99d0bf312d ("kbuild: clear LDFLAGS in the top Makefile"), the top-level Makefile caters to this. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
2018-07-19um: remove redundant 'export LDFLAGS' in arch/x86/Makefile.umMasahiro Yamada1-2/+0
This is already exported by the top-level Makefile. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
2018-07-18kbuild: Use HOST*FLAGS options from the command lineLaura Abbott2-4/+21
Now that we have the rename in place, reuse the HOST*FLAGS options as something that can be set from the command line and included with the rest of the flags. Signed-off-by: Laura Abbott <labbott@redhat.com> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2018-07-18kbuild: Rename HOST_LOADLIBES to KBUILD_HOSTLDLIBSLaura Abbott6-22/+22
In preparation for enabling command line LDLIBS, re-name HOST_LOADLIBES to KBUILD_HOSTLDLIBS as the internal use only flags. Also rename existing usage to HOSTLDLIBS for consistency. This should not have any visible effects. Signed-off-by: Laura Abbott <labbott@redhat.com> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2018-07-18kbuild: Rename HOSTLDFLAGS to KBUILD_HOSTLDFLAGSLaura Abbott5-10/+10
In preparation for enabling command line LDFLAGS, re-name HOSTLDFLAGS to KBUILD_HOSTLDFLAGS as the internal use only flags. This should not have any visible effects. Signed-off-by: Laura Abbott <labbott@redhat.com> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2018-07-18kbuild: Rename HOSTCXXFLAGS to KBUILD_HOSTCXXFLAGSLaura Abbott2-3/+3
In preparation for enabling command line CXXFLAGS, re-name HOSTCXXFLAGS to KBUILD_HOSTCXXFLAGS as the internal use only flags. This should not have any visible effects. Signed-off-by: Laura Abbott <labbott@redhat.com> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2018-07-18kbuild: Rename HOSTCFLAGS to KBUILD_HOSTCFLAGSLaura Abbott9-14/+14
In preparation for enabling command line CFLAGS, re-name HOSTCFLAGS to KBUILD_HOSTCFLAGS as the internal use only flags. This should not have any visible effects. Signed-off-by: Laura Abbott <labbott@redhat.com> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2018-07-18arm64: Add build salt to the vDSOLaura Abbott1-0/+3
The vDSO needs to have a unique build id in a similar manner to the kernel and modules. Use the build salt macro. Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Laura Abbott <labbott@redhat.com> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2018-07-18powerpc: Add build salt to the vDSOLaura Abbott1-0/+3
The vDSO needs to have a unique build id in a similar manner to the kernel and modules. Use the build salt macro. Signed-off-by: Laura Abbott <labbott@redhat.com> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2018-07-18x86: Add build salt to the vDSOLaura Abbott2-0/+6
The vDSO needs to have a unique build id in a similar manner to the kernel and modules. Use the build salt macro. Acked-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Laura Abbott <labbott@redhat.com> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2018-07-18kbuild: Add build salt to the kernel and modulesLaura Abbott4-0/+35
In Fedora, the debug information is packaged separately (foo-debuginfo) and can be installed separately. There's been a long standing issue where only one version of a debuginfo info package can be installed at a time. There's been an effort for Fedora for parallel debuginfo to rectify this problem. Part of the requirement to allow parallel debuginfo to work is that build ids are unique between builds. The existing upstream rpm implementation ensures this by re-calculating the build-id using the version and release as a seed. This doesn't work 100% for the kernel because of the vDSO which is its own binary and doesn't get updated when embedded. Fix this by adding some data in an ELF note for both the kernel and modules. The data is controlled via a Kconfig option so distributions can set it to an appropriate value to ensure uniqueness between builds. Suggested-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Laura Abbott <labbott@redhat.com> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2018-07-18kbuild: verify that $DEPMOD is installedRandy Dunlap2-13/+14
Verify that 'depmod' ($DEPMOD) is installed. This is a partial revert of commit 620c231c7a7f ("kbuild: do not check for ancient modutils tools"). Also update Documentation/process/changes.rst to refer to kmod instead of module-init-tools. Fixes kernel bugzilla #198965: https://bugzilla.kernel.org/show_bug.cgi?id=198965 Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Cc: Lucas De Marchi <lucas.demarchi@profusion.mobi> Cc: Lucas De Marchi <lucas.de.marchi@gmail.com> Cc: Michal Marek <michal.lkml@markovi.net> Cc: Jessica Yu <jeyu@kernel.org> Cc: Chih-Wei Huang <cwhuang@linux.org.tw> Cc: stable@vger.kernel.org # any kernel since 2012 Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2018-07-18kbuild: move bin2c back to scripts/ from scripts/basic/Masahiro Yamada10-10/+7
Commit 8370edea81e3 ("bin2c: move bin2c in scripts/basic") moved bin2c to the scripts/basic/ directory, incorrectly stating "Kexec wants to use bin2c and it wants to use it really early in the build process. See arch/x86/purgatory/ code in later patches." Commit bdab125c9301 ("Revert "kexec/purgatory: Add clean-up for purgatory directory"") and commit d6605b6bbee8 ("x86/build: Remove unnecessary preparation for purgatory") removed the redundant purgatory build magic entirely. That means that the move of bin2c was unnecessary in the first place. fixdep is the only host program that deserves to sit in the scripts/basic/ directory. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>