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/
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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.
Signed-off-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
Signed-off-by: Christoph Lameter <clameter@xxxxxxx>
Cc: Andy Whitcroft <apw@xxxxxxxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxx>
Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Kbuild | 56 +++++++++++++++++++++++++++++++++++++++-------
kernel/bounds.c | 19 +++++++++++++++
2 files changed, 67 insertions(+), 8 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
@@ -1,19 +1,54 @@
#
# Kbuild for top-level directory of the kernel
# This file takes care of the following:
-# 1) Generate asm-offsets.h
-# 2) Check for missing system calls
+# 1) Generate bounds.h
+# 2) Generate asm-offsets.h (may need bounds.h)
+# 3) Check for missing system calls
#####
-# 1) Generate asm-offsets.h
+# 1) Generate bounds.h
+
+bounds-file := include/linux/bounds.h
+
+always := $(bounds-file)
+targets := $(bounds-file) kernel/bounds.s
+
+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
+kernel/bounds.s: kernel/bounds.c FORCE
+ $(Q)mkdir -p $(dir $@)
+ $(call if_changed_dep,cc_s_c)
+
+$(obj)/$(bounds-file): kernel/bounds.s Kbuild
+ $(Q)mkdir -p $(dir $@)
+ $(call cmd,bounds)
+
+#####
+# 2) Generate asm-offsets.h
#
offsets-file := include/asm-$(SRCARCH)/asm-offsets.h
-always := $(offsets-file)
-targets := $(offsets-file)
+always += $(offsets-file)
+targets += $(offsets-file)
targets += arch/$(SRCARCH)/kernel/asm-offsets.s
-clean-files := $(addprefix $(objtree)/,$(targets))
+
# Default sed regexp - multiline due to syntax constraints
define sed-y
@@ -40,7 +75,8 @@ define cmd_offsets
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
+arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \
+ $(obj)/$(bounds-file) FORCE
$(Q)mkdir -p $(dir $@)
$(call if_changed_dep,cc_s_c)
@@ -49,7 +85,7 @@ $(obj)/$(offsets-file): arch/$(SRCARCH)/
$(call cmd,offsets)
#####
-# 2) Check for missing system calls
+# 3) Check for missing system calls
#
quiet_cmd_syscalls = CALL $<
@@ -58,3 +94,7 @@ quiet_cmd_syscalls = CALL $<
PHONY += missing-syscalls
missing-syscalls: scripts/checksyscalls.sh FORCE
$(call cmd,syscalls)
+
+# Delete all targets during make clean
+clean-files := $(addprefix $(objtree)/,$(targets))
+
diff -puN /dev/null kernel/bounds.c
--- /dev/null
+++ a/kernel/bounds.c
@@ -0,0 +1,19 @@
+/*
+ * Generate definitions needed by the preprocessor.
+ * This code generates raw asm output which is post-processed
+ * to extract and format the required data.
+ */
+
+#define __GENERATING_BOUNDS_H
+/* Include headers that define the enum constants of interest */
+
+#define DEFINE(sym, val) \
+ asm volatile("\n->" #sym " %0 " #val : : "i" (val))
+
+#define BLANK() asm volatile("\n->" : : )
+
+void foo(void)
+{
+ /* The enum constants to put into include/linux/bounds.h */
+ /* End of constants */
+}
_
Patches currently in -mm which might be from clameter@xxxxxxx are
mm-fix-boundary-checking-in-free_bootmem_core.patch
mm-fix-boundary-checking-in-free_bootmem_core-fix.patch
x86_64-free_bootmem-should-take-phy.patch
git-unionfs.patch
git-slub.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-have-zonelist-contains-structs-with-both-a-zone-pointer-and-zone_idx-fix-memcg-ooms.patch
mm-have-zonelist-contains-structs-with-both-a-zone-pointer-and-zone_idx-just-return-do_try_to_free_pages.patch
mm-have-zonelist-contains-structs-with-both-a-zone-pointer-and-zone_idx-just-return-do_try_to_free_pages-do_try_to_free_pages-gfp_mask-redundant.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-filter-based-on-a-nodemask-as-well-as-a-gfp_mask-make-dequeue_huge_page_vma-obey-mpol_bind-nodemask-rework.patch
mm-move-cache_line_size-to-linux-cacheh.patch
mempolicy-convert-mpol-constants-to-enum.patch
mempolicy-support-optional-mode-flags.patch
mempolicy-support-optional-mode-flags-fix.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
mempolicy-move-rebind-functions.patch
mempolicy-create-mempolicy_operations-structure.patch
mempolicy-create-mempolicy_operations-structure-fix.patch
mempolicy-small-header-file-cleanup.patch
mempolicy-disallow-static-or-relative-flags-for-local-preferred-mode.patch
mempolicy-fix-parsing-of-tmpfs-mpol-mount-option.patch
mm-make-mem_map-allocation-continuous.patch
mm-fix-alloc_bootmem_core-to-use-fast-searching-for-all-nodes.patch
mm-allocate-section_map-for-sparse_init.patch
mm-make-early_pfn_to_nid-a-c-function.patch
vmalloc-show-vmalloced-areas-via-proc-vmallocinfo.patch
vmalloc-show-vmalloced-areas-via-proc-vmallocinfo-checkpatch-fixes.patch
vmallocinfo-add-caller-information.patch
vmallocinfo-add-caller-information-checkpatch-fixes.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
get-rid-of-__zone_count.patch
mm-add-nr_writeback_temp-counter.patch
remove-div_long_long_rem.patch
reiser4.patch
reiser4-portion-of-zero_user-cleanup-patch.patch
page-owner-tracking-leak-detector.patch
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