Changes in Makefile

faabed29 - kbuild: introduce hostprogs-always-y and userprogs-always-y

Sat, 01 Aug 2020 12:27:18 +0000

kbuild: introduce hostprogs-always-y and userprogs-always-yTo build host programs, you need to add the program names to 'hostprogs'to use the necessary build rule, but it is not enough to build thembecause there is no dependency.There are two types of host programs: built as the prerequisite ofanother (e.g. gen_crc32table in lib/Makefile), or always built whenKbuild visits the Makefile (e.g. genksyms in scripts/genksyms/Makefile).The latter is typical in Makefiles under scripts/, which contains hostprograms globally used during the kernel build. To build them, you needto add them to both 'hostprogs' and 'always-y'.This commit adds hostprogs-always-y as a shorthand.The same applies to user programs. net/bpfilter/Makefile buildsbpfilter_umh on demand, hence always-y is unneeded. In contrast,programs under samples/ are added to both 'userprogs' and 'always-y'so they are always built when Kbuild visits the Makefiles.userprogs-always-y works as a shorthand.Signed-off-by: Masahiro Yamada Acked-by: Miguel Ojeda List of files: /linux-6.15/samples/binderfs/Makefile

fca5e949 - samples: binderfs: really compile this sample and fix build issues

Sun, 07 Jun 2020 03:20:53 +0000

samples: binderfs: really compile this sample and fix build issuesEven after commit c624adc9cb6e ("samples: fix binderfs sample"), thissample is never compiled.'hostprogs' teaches Kbuild that this is a host program, but not enoughto order to compile it. You must add it to 'always-y' to really compileit.Since this sample has never been compiled in upstream, various issuesare left unnoticed.[1] compilers without are still widely used is only available since commit c13295ad219d("binderfs: rename header to binderfs.h"), i.e., Linux 5.0If your compiler is based on UAPI headers older than Linux 5.0, youwill see the following error: samples/binderfs/binderfs_example.c:16:10: fatal error: linux/android/binderfs.h: No such file or directory #include ^~~~~~~~~~~~~~~~~~~~~~~~~~ compilation terminated.You cannot rely on compilers having such a new header.The common approach is to install UAPI headers of this kernel intousr/include, and then add it to the header search path.I added 'depends on HEADERS_INSTALL' in Kconfig, and '-I usr/include'compiler flag in Makefile.[2] compile the sample for target architectureBecause headers_install works for the target architecture, only thenative compiler was able to build sample code that requires'-I usr/include'.Commit 7f3a59db274c ("kbuild: add infrastructure to build userspaceprograms") added the new syntax 'userprogs' to compile user-spaceprograms for the target architecture.Use it, and then 'ifndef CROSS_COMPILE' will go away.I added 'depends on CC_CAN_LINK' because $(CC) is not necessarilycapable of linking user-space programs.[3] use subdir-y to descend into samples/binderfsSince this directory does not contain any kernel-space code, it has nopoint in generating built-in.a or modules.order.Replace obj-$(CONFIG_...) with subdir-$(CONFIG_...).[4] -Wunused-variable warningIf I compile this, I see the following warning. samples/binderfs/binderfs_example.c: In function 'main': samples/binderfs/binderfs_example.c:21:9: warning: unused variable 'len' [-Wunused-variable] 21 | size_t len; | ^~~I removed the unused 'len'.[5] CONFIG_ANDROID_BINDERFS is not requiredSince this is a user-space standalone program, it is independent ofthe kernel configuration.Remove 'depends on ANDROID_BINDERFS'.Fixes: 9762dc1432e1 ("samples: add binderfs sample program")Fixes: c624adc9cb6e ("samples: fix binderfs sample")Signed-off-by: Masahiro Yamada Acked-by: Christian Brauner List of files: /linux-6.15/samples/binderfs/Makefile

c624adc9 - samples: fix binderfs sample

Tue, 28 Apr 2020 21:25:33 +0000

samples: fix binderfs sampleA routine check for misspelled Kconfig symbols showed on instancefrom last year, the correct symbol name is CONFIG_ANDROID_BINDERFS,not CONFIG_CONFIG_ANDROID_BINDERFS, so the extra prefix mustbe removed in the Kconfig file to allow enabling the sample.As the actual sample fails to build as a kernel module, change theMakefile enough to get to build as a hostprog instead.Fixes: 9762dc1432e1 ("samples: add binderfs sample program")Signed-off-by: Arnd Bergmann Acked-by: Christian Brauner Link: https://lore.kernel.org/r/20200428212555.2806258-1-arnd@arndb.deSigned-off-by: Jonathan Corbet List of files: /linux-6.15/samples/binderfs/Makefile

ec8f24b7 - treewide: Add SPDX license identifier - Makefile/Kconfig

Sun, 19 May 2019 12:07:45 +0000

treewide: Add SPDX license identifier - Makefile/KconfigAdd SPDX license identifiers to all Make/Kconfig files which: - Have no license information of any formThese files fall under the project license, GPL v2 only. The resulting SPDXlicense identifier is: GPL-2.0-onlySigned-off-by: Thomas Gleixner Signed-off-by: Greg Kroah-Hartman List of files: /linux-6.15/samples/binderfs/Makefile

9762dc14 - samples: add binderfs sample program

Fri, 11 Jan 2019 13:41:00 +0000

samples: add binderfs sample programThis adds a simple sample program mounting binderfs and adding, thenremoving a binder device. Hopefully, it will be helpful to users who wantto know how binderfs is supposed to be used.Signed-off-by: Christian Brauner Signed-off-by: Jonathan Corbet List of files: /linux-6.15/samples/binderfs/Makefile