On 3/26/19 10:40 AM, Joao Moreira wrote:
On 3/20/19 4:08 PM, Miroslav Benes wrote:
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index fd03d60f6c5a..1e28ad21314c 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -247,6 +247,11 @@ cmd_gen_ksymdeps = \
$(CONFIG_SHELL) $(srctree)/scripts/gen_ksymdeps.sh $@ >> $(dot-target).cmd
endif
+ifdef CONFIG_LIVEPATCH
+cmd_livepatch = $(if $(LIVEPATCH_$(basetarget).o), \
+ $(shell touch $(MODVERDIR)/$(basetarget).livepatch))
+endif
+
define rule_cc_o_c
$(call cmd,checksrc)
$(call cmd_and_fixdep,cc_o_c)
@@ -283,6 +288,7 @@ $(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) F
$(call if_changed_rule,cc_o_c)
@{ echo $(@:.o=.ko); echo $@; \
$(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
+ $(call cmd_livepatch)
quiet_cmd_cc_lst_c = MKLST $@
cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
Since cmd_livepatch is only called for single-used-m, does this mean
that we can only klp-convert single object file livepatch modules?
I stumbled upon this when trying to create a self-test module that
incorporated two object files. I tried adding a $(call cmd_livepatch)
in the recipe for $(obj)/%.o, but that didn't help. My kbuild foo
wasn't good enough to figure this one out.
I looked at my original code and it is a bit different there. I placed it
under rule_cc_o_c right after objtool command. If I remember correctly
this is the correct recipe for .c->.o. Unfortunately I forgot the details
and there is of course nothing about it in my notes.
Does it help?
Joao, is there a reason you moved it elsewhere?
Hi,
Unfortunately I can't remember why the chunk was moved to where it is in
this version of the patch, sorry. Yet, I did try to move this into the
rule cc_o_c and it seemed to work with not damage.
Joe, would you kindly verify and squash properly the patch below, which
places cmd_livepatch in rule_cc_o_c?
Thank you.
Subject: [PATCH] Move cmd_klp_convert to the right place
Signed-off-by: Joao Moreira <jmoreira@xxxxxxx>
---
scripts/Makefile.build | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 1e28ad21314c..5f66106a47d6 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -260,6 +260,7 @@ define rule_cc_o_c
$(call cmd,objtool)
$(call cmd,modversions_c)
$(call cmd,record_mcount)
+ $(call cmd,livepatch)
endef
define rule_as_o_S
@@ -288,7 +289,6 @@ $(single-used-m): $(obj)/%.o: $(src)/%.c
$(recordmcount_source) $(objtool_dep) F
$(call if_changed_rule,cc_o_c)
@{ echo $(@:.o=.ko); echo $@; \
$(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
- $(call cmd_livepatch)
quiet_cmd_cc_lst_c = MKLST $@
cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
Hi Joao,
This change seems to work okay for (again) single object modules, but
I'm having issues with multi-object modules.
Here are my sources:
% head -n100 *
==> Makefile <==
KDIR := /lib/modules/$(shell uname -r)/build
PWD := $(shell pwd)
LIVEPATCH_test_mod_a.o := y
LIVEPATCH_test_mod_b.o := y
obj-m += test_mod.o
test_mod-y := \
test_mod_a.o \
test_mod_b.o
default:
$(MAKE) -C $(KDIR) M=$(PWD)
clean:
@rm -rf .tmp_versions/
@rm -f .*.cmd *.o *.mod.* *.ko modules.order Module.symvers
==> test_mod_a.c <==
#include <linux/module.h>
__used static void function(void) { }
MODULE_LICENSE("GPL");
==> test_mod_b.c <==
__used static void function(void) { }
But when I build, I don't see klp-convert invoked for any of the object
files:
% make
make -C /lib/modules/5.0.0+/build M=/home/cloud-user/klp-convert-modtest
make[1]: Entering directory '/home/cloud-user/disk/linux'
CC [M] /home/cloud-user/klp-convert-modtest/test_mod_a.o
CC [M] /home/cloud-user/klp-convert-modtest/test_mod_b.o
LD [M] /home/cloud-user/klp-convert-modtest/test_mod.o
Building modules, stage 2.
MODPOST 1 modules
CC /home/cloud-user/klp-convert-modtest/test_mod.mod.o
LD [M] /home/cloud-user/klp-convert-modtest/test_mod.ko
make[1]: Leaving directory '/home/cloud-user/disk/linux'
However, if I modify the Makefile to build test_mod_a.o into its own
module, I see "KLP
/home/cloud-user/klp-convert-modtest/test_mod_a.ko" in the build output.
-- Joe
