The patch titled
kbuild: create a way to create preprocessor constants from C expressions
has been added to the -mm tree. Its filename is
kbuild-create-a-way-to-create-preprocessor-constants-from-c-expressions.patch
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The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: kbuild: create a way to create preprocessor constants from C expressions
From: Christoph Lameter <clameter@xxxxxxx>
The use of enums create constants that are not available to the preprocessor
when building the kernel (f.e. MAX_NR_ZONES).
Arch code already has a way to export constants calculated to the preprocessor
through the asm-offsets.c file. Generate something similar for the core
kernel through kbuild.
Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
Signed-off-by: Christoph Lameter <clameter@xxxxxxx>
Cc: Nick Piggin <nickpiggin@xxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Cc: Andy Whitcroft <apw@xxxxxxxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Kbuild | 31 +++++++++++++++++++++++++++++--
include/linux/bounds.h | 10 ++++++++++
kernel/bounds.c | 16 ++++++++++++++++
3 files changed, 55 insertions(+), 2 deletions(-)
diff -puN Kbuild~kbuild-create-a-way-to-create-preprocessor-constants-from-c-expressions Kbuild
--- a/Kbuild~kbuild-create-a-way-to-create-preprocessor-constants-from-c-expressions
+++ a/Kbuild
@@ -9,9 +9,10 @@
#
offsets-file := include/asm-$(SRCARCH)/asm-offsets.h
+bounds := include/linux/bounds.h
-always := $(offsets-file)
-targets := $(offsets-file)
+always := $(offsets-file) $(bounds)
+targets := $(offsets-file) $(bounds)
targets += arch/$(SRCARCH)/kernel/asm-offsets.s
clean-files := $(addprefix $(objtree)/,$(targets))
@@ -39,6 +40,23 @@ define cmd_offsets
echo "#endif" ) > $@
endef
+quiet_cmd_bounds = GEN $@
+define cmd_bounds
+ (set -e; \
+ echo "#ifndef __LINUX_BOUNDS_H__"; \
+ echo "#define __LINUX_BOUNDS_H__"; \
+ echo "/*"; \
+ echo " * DO NOT MODIFY."; \
+ echo " *"; \
+ echo " * This file was generated by Kbuild"; \
+ echo " *"; \
+ echo " */"; \
+ echo ""; \
+ sed -ne $(sed-y) $<; \
+ echo ""; \
+ echo "#endif" ) > $@
+endef
+
# We use internal kbuild rules to avoid the "is up to date" message from make
arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c FORCE
$(Q)mkdir -p $(dir $@)
@@ -48,6 +66,15 @@ $(obj)/$(offsets-file): arch/$(SRCARCH)/
$(Q)mkdir -p $(dir $@)
$(call cmd,offsets)
+# We use internal kbuild rules to avoid the "is up to date" message from make
+kernel/bounds.s: kernel/bounds.c FORCE
+ $(Q)mkdir -p $(dir $@)
+ $(call if_changed_dep,cc_s_c)
+
+$(obj)/$(bounds): kernel/bounds.s Kbuild
+ $(Q)mkdir -p $(dir $@)
+ $(call cmd,bounds)
+
#####
# 2) Check for missing system calls
#
diff -puN /dev/null include/linux/bounds.h
--- /dev/null
+++ a/include/linux/bounds.h
@@ -0,0 +1,10 @@
+#ifndef __LINUX_BOUNDS_H__
+#define __LINUX_BOUNDS_H__
+/*
+ * DO NOT MODIFY.
+ *
+ * This file was generated by Kbuild
+ *
+ */
+
+#endif
diff -puN /dev/null kernel/bounds.c
--- /dev/null
+++ a/kernel/bounds.c
@@ -0,0 +1,16 @@
+/*
+ * Generate definitions needed by the preprocessor.
+ * This code generates raw asm output which is post-processed
+ * to extract and format the required data.
+ */
+
+#include <linux/mm.h>
+
+#define DEFINE(sym, val) \
+ asm volatile("\n->" #sym " %0 " #val : : "i" (val))
+
+#define BLANK() asm volatile("\n->" : : )
+
+void foo(void)
+{
+}
_
Patches currently in -mm which might be from clameter@xxxxxxx are
fix-mempolicy-reference-counting-bugs.patch
git-unionfs.patch
git-slub.patch
slab-pass-correct-flags-to-kmem_getpages.patch
ntfs-fix-nommu-build.patch
x86-cast-cmpxchg-and-cmpxchg_local-result-for-386-and-486.patch
remove-set_migrateflags.patch
mm-use-zonelists-instead-of-zones-when-direct-reclaiming-pages.patch
mm-introduce-node_zonelist-for-accessing-the-zonelist-for-a-gfp-mask.patch
mm-remember-what-the-preferred-zone-is-for-zone_statistics.patch
mm-use-two-zonelist-that-are-filtered-by-gfp-mask.patch
mm-have-zonelist-contains-structs-with-both-a-zone-pointer-and-zone_idx.patch
mm-filter-based-on-a-nodemask-as-well-as-a-gfp_mask.patch
mm-filter-based-on-a-nodemask-as-well-as-a-gfp_mask-doc-fixes.patch
mm-filter-based-on-a-nodemask-as-well-as-a-gfp_mask-make-dequeue_huge_page_vma-obey-mpol_bind-nodemask.patch
mm-move-cache_line_size-to-linux-cacheh.patch
mempolicy-convert-mpol-constants-to-enum.patch
mempolicy-support-optional-mode-flags.patch
mempolicy-add-mpol_f_static_nodes-flag.patch
mempolicy-add-bitmap_onto-and-bitmap_fold-operations.patch
mempolicy-add-mpol_f_relative_nodes-flag.patch
mempolicy-update-numa-memory-policy-documentation.patch
sparsemem-vmemmap-does-not-need-section-bits.patch
kbuild-create-a-way-to-create-preprocessor-constants-from-c-expressions.patch
pageflags-use-an-enum-for-the-flags.patch
pageflags-get-rid-of-flags_reserved.patch
pageflags-introduce-macros-to-generate-page-flag-functions.patch
pageflags-convert-to-the-use-of-new-macros.patch
pageflags-use-proper-page-flag-functions-in-xen.patch
pageflags-eliminate-pg_xxx-aliases.patch
reiser4.patch
reiser4-portion-of-zero_user-cleanup-patch.patch
page-owner-tracking-leak-detector.patch
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