kbuild: Add support for an "archheaders" target

Add support for an "archheaders" target.  This target can generate
files that need to be installed for user space by "make
headers_install" or "make headers_install_all".

In order to support "make headers_install_all", it must be able to run
without the tree having to be configured first.

Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Michal Marek <mmarek@suse.cz>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

1 files changed, 32 insertions, 18 deletions

diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt
index f47cdefb4d1e..ab0a984530d8 100644
--- a/Documentation/kbuild/makefiles.txt
+++ b/Documentation/kbuild/makefiles.txt
@@ -33,14 +33,15 @@ This document describes the Linux kernel Makefiles.
 
         === 6 Architecture Makefiles
            --- 6.1 Set variables to tweak the build to the architecture
-           --- 6.2 Add prerequisites to archprepare:
-           --- 6.3 List directories to visit when descending
-           --- 6.4 Architecture-specific boot images
-           --- 6.5 Building non-kbuild targets
-           --- 6.6 Commands useful for building a boot image
-           --- 6.7 Custom kbuild commands
-           --- 6.8 Preprocessing linker scripts
-           --- 6.9 Generic header files
+           --- 6.2 Add prerequisites to archheaders:
+           --- 6.3 Add prerequisites to archprepare:
+           --- 6.4 List directories to visit when descending
+           --- 6.5 Architecture-specific boot images
+           --- 6.6 Building non-kbuild targets
+           --- 6.7 Commands useful for building a boot image
+           --- 6.8 Custom kbuild commands
+           --- 6.9 Preprocessing linker scripts
+           --- 6.10 Generic header files
 
         === 7 Kbuild syntax for exported headers
                 --- 7.1 header-y
@@ -252,7 +253,7 @@ more details, with real examples.
         This will create a library lib.a based on delay.o. For kbuild to
         actually recognize that there is a lib.a being built, the directory
         shall be listed in libs-y.
-        See also "6.3 List directories to visit when descending".
+        See also "6.4 List directories to visit when descending".
 
         Use of lib-y is normally restricted to lib/ and arch/*/lib.
 
@@ -974,7 +975,20 @@ When kbuild executes, the following steps are followed (roughly):
         $(KBUILD_ARFLAGS) set by the top level Makefile to "D" (deterministic
         mode) if this option is supported by $(AR).
 
---- 6.2 Add prerequisites to archprepare:
+--- 6.2 Add prerequisites to archheaders:
+
+        The archheaders: rule is used to generate header files that
+        may be installed into user space by "make header_install" or
+        "make headers_install_all".  In order to support
+        "make headers_install_all", this target has to be able to run
+        on an unconfigured tree, or a tree configured for another
+        architecture.
+
+        It is run before "make archprepare" when run on the
+        architecture itself.
+
+
+--- 6.3 Add prerequisites to archprepare:
 
         The archprepare: rule is used to list prerequisites that need to be
         built before starting to descend down in the subdirectories.
@@ -990,7 +1004,7 @@ When kbuild executes, the following steps are followed (roughly):
         generating offset header files.
 
 
---- 6.3 List directories to visit when descending
+--- 6.4 List directories to visit when descending
 
         An arch Makefile cooperates with the top Makefile to define variables
         which specify how to build the vmlinux file.  Note that there is no
@@ -1019,7 +1033,7 @@ When kbuild executes, the following steps are followed (roughly):
                 drivers-$(CONFIG_OPROFILE)  += arch/sparc64/oprofile/
 
 
---- 6.4 Architecture-specific boot images
+--- 6.5 Architecture-specific boot images
 
         An arch Makefile specifies goals that take the vmlinux file, compress
         it, wrap it in bootstrapping code, and copy the resulting files
@@ -1070,7 +1084,7 @@ When kbuild executes, the following steps are followed (roughly):
 
         When "make" is executed without arguments, bzImage will be built.
 
---- 6.5 Building non-kbuild targets
+--- 6.6 Building non-kbuild targets
 
     extra-y
 
@@ -1090,7 +1104,7 @@ When kbuild executes, the following steps are followed (roughly):
         shall be built, but shall not be linked as part of built-in.o.
 
 
---- 6.6 Commands useful for building a boot image
+--- 6.7 Commands useful for building a boot image
 
         Kbuild provides a few macros that are useful when building a
         boot image.
@@ -1112,7 +1126,7 @@ When kbuild executes, the following steps are followed (roughly):
         always be built.
         Assignments to $(targets) are without $(obj)/ prefix.
         if_changed may be used in conjunction with custom commands as
-        defined in 6.7 "Custom kbuild commands".
+        defined in 6.8 "Custom kbuild commands".
 
         Note: It is a typical mistake to forget the FORCE prerequisite.
         Another common pitfall is that whitespace is sometimes
@@ -1171,7 +1185,7 @@ When kbuild executes, the following steps are followed (roughly):
                 $(obj)/%.dtb: $(src)/%.dts
                         $(call cmd,dtc)
 
---- 6.7 Custom kbuild commands
+--- 6.8 Custom kbuild commands
 
         When kbuild is executing with KBUILD_VERBOSE=0, then only a shorthand
         of a command is normally displayed.
@@ -1198,7 +1212,7 @@ When kbuild executes, the following steps are followed (roughly):
         will be displayed with "make KBUILD_VERBOSE=0".
 
 
---- 6.8 Preprocessing linker scripts
+--- 6.9 Preprocessing linker scripts
 
         When the vmlinux image is built, the linker script
         arch/$(ARCH)/kernel/vmlinux.lds is used.
@@ -1228,7 +1242,7 @@ When kbuild executes, the following steps are followed (roughly):
         The kbuild infrastructure for *lds file are used in several
         architecture-specific files.
 
---- 6.9 Generic header files
+--- 6.10 Generic header files
 
         The directory include/asm-generic contains the header files
         that may be shared between individual architectures.