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Message-Id: <1321569446-20433-3-git-send-email-hpa@linux.intel.com>
Date: Thu, 17 Nov 2011 14:37:20 -0800
From: "H. Peter Anvin" <hpa@...ux.intel.com>
To: linux-kernel@...r.kernel.org, kbuild@...r.kernel.org,
Ingo Molnar <mingo@...e.hu>,
Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>
Cc: "H.J. Lu" <hjl.tools@...il.com>,
David Woodhouse <dwmw2@...radead.org>,
Michal Marek <mmarek@...e.cz>, Sam Ravnborg <sam@...nborg.org>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: [PATCH 2/8] kbuild: Add support for an "archheaders" target
From: "H. Peter Anvin" <hpa@...ux.intel.com>
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@...radead.org>
Cc: Sam Ravnborg <sam@...nborg.org>
Cc: Michal Marek <mmarek@...e.cz>
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
---
Documentation/kbuild/makefiles.txt | 50 +++++++++++++++++++++++-------------
Makefile | 9 ++++--
scripts/headers.sh | 1 +
3 files changed, 39 insertions(+), 21 deletions(-)
diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt
index f47cdef..ab0a984 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.
diff --git a/Makefile b/Makefile
index dab8610..e5e0e07 100644
--- a/Makefile
+++ b/Makefile
@@ -442,7 +442,7 @@ asm-generic:
no-dot-config-targets := clean mrproper distclean \
cscope gtags TAGS tags help %docs check% coccicheck \
- include/linux/version.h headers_% \
+ include/linux/version.h headers_% archheaders \
kernelversion %src-pkg
config-targets := 0
@@ -979,7 +979,7 @@ prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
include/config/auto.conf
$(cmd_crmodverdir)
-archprepare: prepare1 scripts_basic
+archprepare: archheaders prepare1 scripts_basic
prepare0: archprepare FORCE
$(Q)$(MAKE) $(build)=.
@@ -1046,8 +1046,11 @@ hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
# If we do an all arch process set dst to asm-$(hdr-arch)
hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
+PHONY += archheaders
+archheaders:
+
PHONY += __headers
-__headers: include/linux/version.h scripts_basic asm-generic FORCE
+__headers: include/linux/version.h scripts_basic asm-generic archheaders FORCE
$(Q)$(MAKE) $(build)=scripts build_unifdef
PHONY += headers_install_all
diff --git a/scripts/headers.sh b/scripts/headers.sh
index 978b42b..af1ed88 100755
--- a/scripts/headers.sh
+++ b/scripts/headers.sh
@@ -7,6 +7,7 @@ set -e
do_command()
{
if [ -f ${srctree}/arch/$2/include/asm/Kbuild ]; then
+ make ARCH=$2 KBUILD_HEADERS=$1 archheaders
make ARCH=$2 KBUILD_HEADERS=$1 headers_$1
else
printf "Ignoring arch: %s\n" ${arch}
--
1.7.6.4
--
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