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authorMathieu Desnoyers <mathieu.desnoyers@polymtl.ca>2008-02-14 02:03:39 +0300
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-14 03:21:20 +0300
commitb2e3e658b344c6bcfb8fb694100ab2f2b5b2edb0 (patch)
treea2999226edcb6b293c2044716a0146c7f2f82a22 /scripts/Makefile.modpost
parentfb40bd78b0f91b274879cf5db8facd1e04b6052e (diff)
downloadlinux-b2e3e658b344c6bcfb8fb694100ab2f2b5b2edb0.tar.xz
Linux Kernel Markers: create modpost file
This adds some new magic in the MODPOST phase for CONFIG_MARKERS. Analogous to the Module.symvers file, the build will now write a Module.markers file when CONFIG_MARKERS=y is set. This file lists the name, defining module, and format string of each marker, separated by \t characters. This simple text file can be used by offline build procedures for instrumentation code, analogous to how System.map and Module.symvers can be useful to have for kernels other than the one you are running right now. The strings are made easy to extract by having the __trace_mark macro define the name and format together in a single array called __mstrtab_* in the __markers_strings section. This is straightforward and reliable as long as the marker structs are always defined by this macro. It is an unreasonable amount of hairy work to extract the string pointers from the __markers section structs, which entails handling a relocation type for every machine under the sun. Mathieu : - Ran through checkpatch.pl Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: David Smith <dsmith@redhat.com> Cc: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'scripts/Makefile.modpost')
-rw-r--r--scripts/Makefile.modpost11
1 files changed, 11 insertions, 0 deletions
diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
index 65e707e1ffc3..cfc004e04417 100644
--- a/scripts/Makefile.modpost
+++ b/scripts/Makefile.modpost
@@ -13,6 +13,7 @@
# 2) modpost is then used to
# 3) create one <module>.mod.c file pr. module
# 4) create one Module.symvers file with CRC for all exported symbols
+# 4a) [CONFIG_MARKERS] create one Module.markers file listing defined markers
# 5) compile all <module>.mod.c files
# 6) final link of the module to a <module.ko> file
@@ -45,6 +46,10 @@ include scripts/Makefile.lib
kernelsymfile := $(objtree)/Module.symvers
modulesymfile := $(firstword $(KBUILD_EXTMOD))/Module.symvers
+kernelmarkersfile := $(objtree)/Module.markers
+modulemarkersfile := $(firstword $(KBUILD_EXTMOD))/Module.markers
+
+markersfile = $(if $(KBUILD_EXTMOD),$(modulemarkersfile),$(kernelmarkersfile))
# Step 1), find all modules listed in $(MODVERDIR)/
__modules := $(sort $(shell grep -h '\.ko' /dev/null $(wildcard $(MODVERDIR)/*.mod)))
@@ -63,6 +68,8 @@ modpost = scripts/mod/modpost \
$(if $(KBUILD_EXTMOD),-I $(modulesymfile)) \
$(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \
$(if $(CONFIG_DEBUG_SECTION_MISMATCH),,-S) \
+ $(if $(CONFIG_MARKERS),-K $(kernelmarkersfile)) \
+ $(if $(CONFIG_MARKERS),-M $(markersfile)) \
$(if $(KBUILD_EXTMOD)$(KBUILD_MODPOST_WARN),-w)
quiet_cmd_modpost = MODPOST $(words $(filter-out vmlinux FORCE, $^)) modules
@@ -82,6 +89,10 @@ vmlinux.o: FORCE
$(symverfile): __modpost ;
$(modules:.ko=.mod.c): __modpost ;
+ifdef CONFIG_MARKERS
+$(markersfile): __modpost ;
+endif
+
# Step 5), compile all *.mod.c files