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Date: Mon, 25 Jul 2016 12:42:03 +0200
From: Ingo Molnar <mingo@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: [GIT PULL] x86/build changes for v4.8
Linus,
Please pull the latest x86-build-for-linus git tree from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-build-for-linus
# HEAD: cda2c65f981d0c29805fd01ffce441c650ffe6cf kbuild: Remove stale asm-generic wrappers
A build system fix and a cleanup.
out-of-topic modifications in x86-build-for-linus:
----------------------------------------------------
scripts/Makefile.asm-generic # cda2c65f981d: kbuild: Remove stale asm-gen
Thanks,
Ingo
------------------>
James Hogan (2):
kbuild, x86: Track generated headers with generated-y
kbuild: Remove stale asm-generic wrappers
Documentation/kbuild/makefiles.txt | 14 ++++++++++++++
arch/x86/include/asm/Kbuild | 6 ++++++
scripts/Makefile.asm-generic | 17 ++++++++++++++++-
3 files changed, 36 insertions(+), 1 deletion(-)
diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt
index 13f888a02a3d..385a5ef41c17 100644
--- a/Documentation/kbuild/makefiles.txt
+++ b/Documentation/kbuild/makefiles.txt
@@ -47,6 +47,7 @@ This document describes the Linux kernel Makefiles.
--- 7.2 genhdr-y
--- 7.3 destination-y
--- 7.4 generic-y
+ --- 7.5 generated-y
=== 8 Kbuild Variables
=== 9 Makefile language
@@ -1319,6 +1320,19 @@ See subsequent chapter for the syntax of the Kbuild file.
Example: termios.h
#include <asm-generic/termios.h>
+ --- 7.5 generated-y
+
+ If an architecture generates other header files alongside generic-y
+ wrappers, and not included in genhdr-y, then generated-y specifies
+ them.
+
+ This prevents them being treated as stale asm-generic wrappers and
+ removed.
+
+ Example:
+ #arch/x86/include/asm/Kbuild
+ generated-y += syscalls_32.h
+
=== 8 Kbuild Variables
The top Makefile exports the following variables:
diff --git a/arch/x86/include/asm/Kbuild b/arch/x86/include/asm/Kbuild
index aeac434c9feb..2cfed174e3c9 100644
--- a/arch/x86/include/asm/Kbuild
+++ b/arch/x86/include/asm/Kbuild
@@ -1,5 +1,11 @@
+generated-y += syscalls_32.h
+generated-y += syscalls_64.h
+generated-y += unistd_32_ia32.h
+generated-y += unistd_64_x32.h
+generated-y += xen-hypercalls.h
+
genhdr-y += unistd_32.h
genhdr-y += unistd_64.h
genhdr-y += unistd_x32.h
diff --git a/scripts/Makefile.asm-generic b/scripts/Makefile.asm-generic
index 045e0098e962..e4d017d53819 100644
--- a/scripts/Makefile.asm-generic
+++ b/scripts/Makefile.asm-generic
@@ -13,11 +13,26 @@ include scripts/Kbuild.include
# Create output directory if not already present
_dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
+# Stale wrappers when the corresponding files are removed from generic-y
+# need removing.
+generated-y := $(generic-y) $(genhdr-y) $(generated-y)
+all-files := $(patsubst %, $(obj)/%, $(generated-y))
+old-headers := $(wildcard $(obj)/*.h)
+unwanted := $(filter-out $(all-files),$(old-headers))
+
quiet_cmd_wrap = WRAP $@
cmd_wrap = echo "\#include <asm-generic/$*.h>" >$@
-all: $(patsubst %, $(obj)/%, $(generic-y))
+quiet_cmd_remove = REMOVE $(unwanted)
+cmd_remove = rm -f $(unwanted)
+
+all: $(patsubst %, $(obj)/%, $(generic-y)) FORCE
+ $(if $(unwanted),$(call cmd,remove),)
@:
$(obj)/%.h:
$(call cmd,wrap)
+
+PHONY += FORCE
+.PHONY: $(PHONY)
+FORCE: ;
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