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kbuild: asm-generic support
There is an increasing amount of header files shared between individual architectures in asm-generic. To avoid a lot of dummy wrapper files that just include the corresponding file in asm-generic provide some basic support in kbuild for this. With the following patch an architecture can maintain a list of files in the file arch/$(ARCH)/include/asm/Kbuild To use a generic file just add: generic-y += <name-of-header-file.h> For each file listed kbuild will generate the necessary wrapper in arch/$(ARCH)/include/generated/asm. When installing userspace headers a wrapper is likewise created. The original inspiration for this came from the unicore32 patchset - although a different method is used. The patch includes several improvements from Arnd Bergmann. Michael Marek contributed Makefile.asm-generic. Remis Baima did an intial implementation along to achive the same - see https://patchwork.kernel.org/patch/13352/ Signed-off-by: Sam Ravnborg <firstname.lastname@example.org> Acked-by: Guan Xuetao <email@example.com> Tested-by: Guan Xuetao <firstname.lastname@example.org> Acked-by: Arnd Bergmann <email@example.com> Cc: Remis Lima Baima <firstname.lastname@example.org> Signed-off-by: Michal Marek <email@example.com>
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Showing with 81 additions and 5 deletions.
|@@ -0,0 +1,23 @@|
|+# include/asm-generic contains a lot of files that are used|
|+# verbatim by several architectures.|
|+# This Makefile reads the file arch/$(SRCARCH)/include/asm/Kbuild|
|+# and for each file listed in this file with generic-y creates|
|+# a small wrapper file in $(obj) (arch/$(SRCARCH)/include/generated/asm)|
|+kbuild-file := $(srctree)/arch/$(SRCARCH)/include/asm/Kbuild|
|+# Create output directory if not already present|
|+_dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))|
|+quiet_cmd_wrap = WRAP $@|
|+cmd_wrap = echo "\#include <asm-generic/$*.h>" >$@|
|+all: $(patsubst %, $(obj)/%, $(generic-y))|
|+ $(call cmd,wrap)|