Changes in Makefile

b1992c37 - kbuild: use $(src) instead of $(srctree)/$(src) for source directory

Sat, 27 Apr 2024 14:55:02 +0000

kbuild: use $(src) instead of $(srctree)/$(src) for source directoryKbuild conventionally uses $(obj)/ for generated files, and $(src)/ forchecked-in source files. It is merely a convention without any functionaldifference. In fact, $(obj) and $(src) are exactly the same, as definedin scripts/Makefile.build: src := $(obj)When the kernel is built in a separate output directory, $(src) doesnot accurately reflect the source directory location. While Kbuildresolves this discrepancy by specifying VPATH=$(srctree) to search forsource files, it does not cover all cases. For example, when adding aheader search path for local headers, -I$(srctree)/$(src) is typicallypassed to the compiler.This introduces inconsistency between upstream and downstream Makefilesbecause $(src) is used instead of $(srctree)/$(src) for the latter.To address this inconsistency, this commit changes the semantics of$(src) so that it always points to the directory in the source tree.Going forward, the variables used in Makefiles will have the followingmeanings: $(obj) - directory in the object tree $(src) - directory in the source tree (changed by this commit) $(objtree) - the top of the kernel object tree $(srctree) - the top of the kernel source treeConsequently, $(srctree)/$(src) in upstream Makefiles need to be replacedwith $(src).Signed-off-by: Masahiro Yamada Reviewed-by: Nicolas Schier List of files: /linux-6.15/arch/arm/boot/Makefile

92481c7d - ARM: remove obsolete Makefile.boot infrastructure

Wed, 27 Jul 2022 07:26:45 +0000

ARM: remove obsolete Makefile.boot infrastructureThere are a number of old Makefile.boot files that remain from themultiplatform conversion, and three that are still in use.These provide the "ZRELADDR", "PARAMS_PHYS" and "INITRD_PHYS" valuesthat are platform specific. It turns out that we can generally justderive this from information that is available elsewhere:- ZRELADDR is normally detected at runtime with the CONFIG_AUTO_ZRELADDR flag, but also needed to be passed to for 'make uImage'. In a multiplatform kernel, one always has to pass this as the $(LOADADDR) variable, but in the StrongARM kernels we can derive it from the sum of $(CONFIG_PHYS_OFFSET) and $(TEXT_OFFSET) that are already known.- PARAMS_PHYS and INITRD_PHYS are only used for bootpImage, which in turn is only used for the pre-ATAGS 'param_struct' based boot interface on StrongARM based machines with old boot loaders. They can both be derived from CONFIG_PHYS_OFFSET and a machine specific offset for the initrd, so all of the logic for these can be part of arch/arm/boot/bootp/Makefile.Signed-off-by: Arnd Bergmann List of files: /linux-6.15/arch/arm/boot/Makefile

d7bcc5e2 - ARM: 9102/1: move theinstall rules to arch/arm/Makefile

Thu, 29 Jul 2021 14:03:51 +0000

ARM: 9102/1: move theinstall rules to arch/arm/MakefileCurrently, the (z/u)install targets in arch/arm/Makefile descend intoarch/arm/boot/Makefile to invoke the shell script, but there is nogood reason to do so.arch/arm/Makefile can run the shell script directly.Signed-off-by: Masahiro Yamada Signed-off-by: Russell King (Oracle) List of files: /linux-6.15/arch/arm/boot/Makefile

172caf19 - kbuild: remove redundant target cleaning on failure

Mon, 31 Dec 2018 08:24:08 +0000

kbuild: remove redundant target cleaning on failureSince commit 9c2af1c7377a ("kbuild: add .DELETE_ON_ERROR specialtarget"), the target file is automatically deleted on failure.The boilerplate code ... || { rm -f $@; false; }is unneeded.Signed-off-by: Masahiro Yamada List of files: /linux-6.15/arch/arm/boot/Makefile

ca8b5d97 - ARM: XIP kernel: store .data compressed in ROM

Fri, 25 Aug 2017 04:54:18 +0000

ARM: XIP kernel: store .data compressed in ROMThe .data segment stored in ROM is only copied to RAM once at boot timeand never referenced afterwards. This is arguably a suboptimal usage ofROM resources.This patch allows for compressing the .data segment before storing itinto ROM and decompressing it to RAM rather than simply copying it,saving on precious ROM space.Because global data is not available yet (obviously) we must allocatedecompressor workspace memory on the stack. The .bss area is used as astack area for that purpose before it is cleared. The required stackframe is 9568 bytes for __inflate_kernel_data() alone, so make surethe .bss is large enough to cope with that plus extra room for calledfunctions or fail the build.Those numbers were picked arbitrarily based on the above 9568 bytestack frame:10240 (2.5 * PAGE_SIZE): used to override -Wframe-larger-than whosedefault value is 1024.12288 (3 * PAGE_SIZE): minimum .bss size to contain the stack.Signed-off-by: Nicolas Pitre Reviewed-by: Ard Biesheuvel Tested-by: Chris Brandt List of files: /linux-6.15/arch/arm/boot/Makefile

3cb59581 - ARM: 8588/1: localise objcopy flags

Tue, 19 Jul 2016 10:23:37 +0000

ARM: 8588/1: localise objcopy flagsWe currently define OBJCOPYFLAGS in the top-level arm Makefile, and thusthese flags will be passed to all uses of objcopy, kernel-wide, forwhich they are not explicitly overridden. The flags we set are intendedfor converting a few ELF files into raw binaries, and thus the flagschosen are problematic for some other uses which do not expect a rawbinary result, e.g. the upcoming lkdtm rodata test: http://www.openwall.com/lists/kernel-hardening/2016/06/08/2This patch localises the objcopy flags such that they are only used forthe cases we require them for today.Signed-off-by: Mark Rutland Acked-by: Kees Cook Tested-by: Laura Abbott Cc: Russell King Signed-off-by: Russell King List of files: /linux-6.15/arch/arm/boot/Makefile

c6bbfbb7 - ARM: 8576/1: avoid duplicating "Kernel: arch/arm/boot/*Image is ready"

Mon, 30 May 2016 02:01:23 +0000

ARM: 8576/1: avoid duplicating "Kernel: arch/arm/boot/*Image is ready"Commit 3939f3345050 ("ARM: 8418/1: add boot image dependencies tonot generate invalid images") fixed bad image generation for theparallel building, but as its side effect, Kbuild now descends intoarch/arm/boot/ again and again, duplicating the log messages.It looks clumsy, so let's display the same message only once.This commit moves the log rules from arch/arm/boot/Makefile toarch/arm/Makefile. I did not delete them completely because *Imageare the final targets that users are interested in.Without this commit, the log of incremental build is like follows:$ make ARCH=arm UIMAGE_LOADADDR=0x80208000 uImage CHK include/config/kernel.release CHK include/generated/uapi/linux/version.h CHK include/generated/utsrelease.h CHK include/generated/bounds.h CHK include/generated/timeconst.h CHK include/generated/asm-offsets.h CALL scripts/checksyscalls.sh CHK include/generated/compile.h Kernel: arch/arm/boot/Image is ready Kernel: arch/arm/boot/Image is ready Kernel: arch/arm/boot/zImage is ready Kernel: arch/arm/boot/Image is ready Kernel: arch/arm/boot/zImage is ready Image arch/arm/boot/uImage is readyWith this commit, it will look like follows:$ make ARCH=arm UIMAGE_LOADADDR=0x80208000 uImage CHK include/config/kernel.release CHK include/generated/uapi/linux/version.h CHK include/generated/utsrelease.h CHK include/generated/bounds.h CHK include/generated/timeconst.h CHK include/generated/asm-offsets.h CALL scripts/checksyscalls.sh CHK include/generated/compile.h Kernel: arch/arm/boot/Image is ready Kernel: arch/arm/boot/zImage is ready Kernel: arch/arm/boot/uImage is readySigned-off-by: Masahiro Yamada Signed-off-by: Russell King List of files: /linux-6.15/arch/arm/boot/Makefile

be1fb0e8 - kbuild: delete unnecessary "@:"

Thu, 31 Mar 2016 11:14:16 +0000

kbuild: delete unnecessary "@:"Since commit 2aedcd098a94 ('kbuild: suppress annoying "... is up todate." message'), $(call if_changed,...) is evaluated to "@:"when there is nothing to do.We no longer need to add "@:" after $(call if_changed,...) tosuppress "... is up to date." message.Signed-off-by: Masahiro Yamada Signed-off-by: Michal Marek List of files: /linux-6.15/arch/arm/boot/Makefile

bc5ce155 - ARM: 8557/1: specify install, zinstall, and uinstall as PHONY targets

Tue, 05 Apr 2016 02:08:26 +0000

ARM: 8557/1: specify install, zinstall, and uinstall as PHONY targetsObviously, these are PHONY targets.Signed-off-by: Masahiro Yamada Signed-off-by: Russell King List of files: /linux-6.15/arch/arm/boot/Makefile

a34c6635 - ARM: 8529/1: remove 'i' and 'zi' targets

Tue, 16 Feb 2016 02:27:34 +0000

ARM: 8529/1: remove 'i' and 'zi' targetsThese two targets were introduced by commit 13d5fadf45d1 ("[ARM]Make 'i' and 'zi' targets work") to short-circuit the dependenciesfor 'install' and 'zinstall'.After that, commit 19514fc665ff ('arm, kbuild: make "make install"not depend on vmlinux') eventually made "(z)install" equivalent to"(z)i".It is true that 'i' and 'zi' might be still useful as shorthandsbut the original intention had been already lost.They do not even show up in "make ARCH=arm help", so I hope thisdeletion does not have much impact.Signed-off-by: Masahiro Yamada Signed-off-by: Russell King List of files: /linux-6.15/arch/arm/boot/Makefile

38c81fca - ARM: 8528/1: drop redundant "PHONY += FORCE"

Tue, 16 Feb 2016 02:19:52 +0000

ARM: 8528/1: drop redundant "PHONY += FORCE""PHONY += FORCE" is already cared by scripts/Makefile.build,which this file is included from.Signed-off-by: Masahiro Yamada Signed-off-by: Russell King List of files: /linux-6.15/arch/arm/boot/Makefile

7aacad53 - kbuild: use relative path to include Makefile

Fri, 27 Mar 2015 11:43:35 +0000

kbuild: use relative path to include MakefileThe "MAKEFLAGS += --include-dir=$(srctree)" line in the top Makefileallows us to do this.Signed-off-by: Masahiro Yamada Signed-off-by: Michal Marek List of files: /linux-6.15/arch/arm/boot/Makefile

19514fc6 - arm, kbuild: make "make install" not depend on vmlinux

Wed, 17 Jul 2013 16:05:06 +0000

arm, kbuild: make "make install" not depend on vmlinuxInstall targets (install, zinstall, uinstall) on arm have a dependencyto vmlinux. This may cause parts of the kernel to be rebuilt duringinstallation. We must avoid this since this may run as root. Installtargets "ABSOLUTELY MUST NOT MODIFY THE SOURCE TREE." as Linusemphasized this in: http://lkml.org/lkml/2013/7/10/600So on arm and maybe other archs we need the same as for x86: 1648e4f8 x86, kbuild: make "make install" not depend on vmlinuxThis patch fixes this for arm. Dependencies are removed and instead acheck to install.sh is added for the files that are needed.This issue was uncovered by this build error where the -j option isused in conjunction with install targets: $ make $ make zinstall ... DEPMOD Usage: .../scripts/depmod.sh /sbin/depmod (INSTALL_MOD_PATH and INSTALL_PATH variables set, so no root permsrequired in this case.)The problem is that zinstall on arm due to its dependency to vmlinuxdoes a prepare/prepare3 and finally does a forced rewrite ofkernel.release even if it exists already.Rebuilding kernel.release removes it first and then recreates it. Thismight race with another parallel make job running depmod.So this patch should fix this one too.Also quoting $(KERNELRELEASE) arg for install.sh as this messesargument order in case it is empty (which is the case if the kernelwas not built yet).Signed-off-by: Robert Richter Signed-off-by: Robert Richter Acked-by: Michal Marek .Acked-by: Linus Torvalds Signed-off-by: "Yann E. MORIN" Signed-off-by: Michal Marek List of files: /linux-6.15/arch/arm/boot/Makefile

9e25fe6b - ARM: dts: remove generated .dtb files on clean

Tue, 22 Jan 2013 21:27:29 +0000

ARM: dts: remove generated .dtb files on cleancommit 5f300acd8ae9f3d4585154370012ffc5c665330f(ARM: 7152/1: distclean: Remove generated .dtb files)ensured that dtbs were cleaned up when they were inarch/arm/boot.However, with the following commit:commit 499cd8298628eeabf0eb5eb6525d4faa0eec80d8(ARM: dt: change .dtb build rules to build in dts directory)make clean now leaves dtbs in arch/arm/boot/dts/untouched. Include dts directory so that clean-files rulefrom arch/arm/boot/dts/Makefile is invoked when makeclean is done.Cc: Dirk Behme CC: Grant Likely Signed-off-by: Nishanth Menon Signed-off-by: Olof Johansson List of files: /linux-6.15/arch/arm/boot/Makefile

938f94cd - ARM: 7656/1: uImage: Error out on build of multiplatform without LOADADDR

Sat, 23 Feb 2013 07:02:24 +0000

ARM: 7656/1: uImage: Error out on build of multiplatform without LOADADDROn multiplatform kernels, $MACHINE will be empty so there will be nodefault LOADADDR. Fail to build the uImage target unless one is provided by thedeveloper at build time.Signed-off-by: Olof Johansson Acked-by: Nicolas Pitre Signed-off-by: Russell King List of files: /linux-6.15/arch/arm/boot/Makefile

499cd829 - ARM: dt: change .dtb build rules to build in dts directory

Tue, 27 Nov 2012 23:29:11 +0000

ARM: dt: change .dtb build rules to build in dts directoryThe current rules have the .dtb files build in a different directoryfrom the .dts files. The only reason for this is that it was whatPowerPC has done historically. This patch changes ARM to use the genericdtb rule which builds .dtb files in the same directory as the source .dts.Cc: Russell King Cc: Arnd Bergmann Acked-by: Olof Johansson Cc: linux-arm-kernel@lists.infradead.orgSigned-off-by: Grant Likely [swarren: added rm command for old stale .dtb files]Signed-off-by: Stephen Warren Signed-off-by: Rob Herring List of files: /linux-6.15/arch/arm/boot/Makefile

2d4d07b9 - ARM: boot: Fix usage of kecho

Wed, 24 Oct 2012 18:37:28 +0000

ARM: boot: Fix usage of kechoSince commit edc88ceb0 (ARM: be really quiet when building with 'make -s') thefollowing output is generated when building a kernel for ARM:echo ' Kernel: arch/arm/boot/Image is ready' Kernel: arch/arm/boot/Image is ready Building modules, stage 2.echo ' Kernel: arch/arm/boot/zImage is ready' Kernel: arch/arm/boot/zImage is readyAs per Documentation/kbuild/makefiles.txt the correct way of using kecho is'@$(kecho)'.Make this change so no more unwanted 'echo' messages are displayed.Signed-off-by: Fabio Estevam Signed-off-by: Arnd Bergmann List of files: /linux-6.15/arch/arm/boot/Makefile

6722df86 - ARM: 7570/1: quiet down the non make -s output

Sun, 04 Nov 2012 21:03:02 +0000

ARM: 7570/1: quiet down the non make -s outputCommit edc88ceb0c7d285b9f58bc29a638cd8163b59989 silenced the make -s build, butinadvertently made louder the non-silent build. Fix by prepending '@' to eachof the added $(kecho) statements.Build with edc88ceb0c7d285b9f58bc29a638cd8163b59989: CHK include/generated/compile.hecho ' Kernel: arch/arm/boot/Image is ready' Kernel: arch/arm/boot/Image is ready LD arch/arm/boot/compressed/vmlinux OBJCOPY arch/arm/boot/zImageecho ' Kernel: arch/arm/boot/zImage is ready' Kernel: arch/arm/boot/zImage is readyBuild with this fix: CHK include/generated/compile.h Kernel: arch/arm/boot/Image is ready LD arch/arm/boot/compressed/vmlinux OBJCOPY arch/arm/boot/zImage Kernel: arch/arm/boot/zImage is readySigned-off-by: Josh Cartwright Signed-off-by: Russell King List of files: /linux-6.15/arch/arm/boot/Makefile

edc88ceb - ARM: be really quiet when building with 'make -s'

Mon, 30 Apr 2012 12:16:16 +0000

ARM: be really quiet when building with 'make -s'Sometimes we want the kernel build process to only print messageson errors, e.g. in automated build testing. This uses the "kecho"macro that the build system provides to hide a few informationalmessages. Nothing changes for a regular "make" or "make V=1".Without this patch, building any ARM kernel results in: Kernel: arch/arm/boot/Image is ready Kernel: arch/arm/boot/zImage is readySigned-off-by: Arnd Bergmann Acked-by: Nicolas Pitre Cc: Russell King Cc: Catalin Marinas Cc: Michal Marek List of files: /linux-6.15/arch/arm/boot/Makefile

360a0cab - ARM: move all dtb targets out of Makefile.boot

Thu, 06 Sep 2012 18:32:38 +0000

ARM: move all dtb targets out of Makefile.bootIn preparation to support multi-platform kernels, move all the dtb targetsout of the mach Makefile.boot and into the arch/arm/boot/dts/Makefilewhich is closer to the sources.DTBs are only built when CONFIG_OF is enabled and now use top levelCONFIG_ARCH_xxx instead of chip or board specific config options.Signed-off-by: Rob Herring Cc: Russell King Cc: Andrew Victor Cc: Nicolas Ferre Cc: Jean-Christophe Plagniol-Villard Cc: Kukjin Kim Cc: Sascha Hauer Cc: Jason Cooper Cc: Andrew Lunn Cc: Gregory Clement Acked-by: Shawn Guo Cc: Viresh Kumar Cc: Shiraz Hashim Cc: Rajeev Kumar Cc: Stephen Warren Cc: Srinidhi Kasagar Cc: Linus Walleij List of files: /linux-6.15/arch/arm/boot/Makefile