[PATCH 2/3] kbuild: Allow to specify composite modules with modname-m

Michal Marek
2015-10-28T13:26:01Z

From: Michal Marek <mmarek@suse.com>

This allows to write

drm-$(CONFIG_AGP) += drm_agpsupport.o

without having to handle CONFIG_AGP=y vs. CONFIG_AGP=m. Only support
this syntax for modules, since built-in code depending on something
modular cannot work and init/Makefile actually relies on the current
semantics. There are a few drivers which adapted to the current
semantics out of necessity; these are fixed to also work when the
respective subsystem is modular.

Cc: Peter Chen <Peter.Chen@freescale.com>
Cc: linux-usb@vger.kernel.org
Cc: Joern Engel <joern@logfs.org>
Cc: Prasad Joshi <prasadjoshi.linux@gmail.com>
Cc: logfs@logfs.org
Signed-off-by: Michal Marek <mmarek@suse.com>
---
drivers/misc/ibmasm/ibmasm.h | 2 +-
drivers/usb/chipidea/otg_fsm.h | 2 +-
fs/logfs/logfs.h | 2 +-
scripts/Makefile.build | 8 ++++++--
scripts/Makefile.lib | 4 ++--
5 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/misc/ibmasm/ibmasm.h b/drivers/misc/ibmasm/ibmasm.h
index 9b08344..5bd1277 100644
--- a/drivers/misc/ibmasm/ibmasm.h
+++ b/drivers/misc/ibmasm/ibmasm.h
@@ -211,7 +211,7 @@ void ibmasmfs_unregister(void);
void ibmasmfs_add_sp(struct service_processor *sp);

/* uart */
-#ifdef CONFIG_SERIAL_8250
+#if IS_ENABLED(CONFIG_SERIAL_8250)
void ibmasm_register_uart(struct service_processor *sp);
void ibmasm_unregister_uart(struct service_processor *sp);
#else
diff --git a/drivers/usb/chipidea/otg_fsm.h b/drivers/usb/chipidea/otg_fsm.h
index 2689375..262d6ef 100644
--- a/drivers/usb/chipidea/otg_fsm.h
+++ b/drivers/usb/chipidea/otg_fsm.h
@@ -62,7 +62,7 @@
/* SSEND time before SRP */
#define TB_SSEND_SRP (1500) /* minimum 1.5 sec, section:5.1.2 */

-#ifdef CONFIG_USB_OTG_FSM
+#if IS_ENABLED(CONFIG_USB_OTG_FSM)

int ci_hdrc_otg_fsm_init(struct ci_hdrc *ci);
int ci_otg_fsm_work(struct ci_hdrc *ci);
diff --git a/fs/logfs/logfs.h b/fs/logfs/logfs.h
index 5f09376..23f961a 100644
--- a/fs/logfs/logfs.h
+++ b/fs/logfs/logfs.h
@@ -485,7 +485,7 @@ static inline int logfs_get_sb_bdev(struct logfs_super *s,
#endif

/* dev_mtd.c */
-#ifdef CONFIG_MTD
+#if IS_ENABLED(CONFIG_MTD)
int logfs_get_sb_mtd(struct logfs_super *s, int mtdnr);
#else
static inline int logfs_get_sb_mtd(struct logfs_super *s, int mtdnr)
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 01df30a..2c47f9c 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -372,10 +372,14 @@ endif
# <composite-object>-objs :=
# or
# <composite-object>-y :=
+# or
+# <composite-object>-m :=
+# The -m syntax only works if <composite object> is a module
link_multi_deps = \
$(filter $(addprefix $(obj)/, \
$($(subst $(obj)/,,$(@:.o=-objs))) \
-$($(subst $(obj)/,,$(@:.o=-y)))), $^)
+$($(subst $(obj)/,,$(@:.o=-y))) \
+$($(subst $(obj)/,,$(@:.o=-m)))), $^)

quiet_cmd_link_multi-y = LD $@
cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
@@ -390,7 +394,7 @@ $(call multi_depend, $(multi-used-y), .o, -objs -y)
$(multi-used-m): FORCE
$(call if_changed,link_multi-m)
@{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
-$(call multi_depend, $(multi-used-m), .o, -objs -y)
+$(call multi_depend, $(multi-used-m), .o, -objs -y -m)

targets += $(multi-used-y) $(multi-used-m)

diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 79e8661..e18957b 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -48,7 +48,7 @@ subdir-ym := $(sort $(subdir-y) $(subdir-m))

# if $(foo-objs) exists, foo.o is a composite object
multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
-multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
+multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))), $(m))))
multi-used := $(multi-used-y) $(multi-used-m)
single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))

@@ -67,7 +67,7 @@ obj-dirs := $(dir $(multi-objs) $(obj-y))

# Replace multi-part objects by their individual parts, look at local dir only
real-objs-y := $(foreach m, $(filter-out $(subdir-obj-y), $(obj-y)), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) $(extra-y)
-real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
+real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)),$(m)))

# Add subdir path

--
1.9.2