diff options
| -rw-r--r-- | Documentation/kbuild/makefiles.txt | 16 | ||||
| -rw-r--r-- | Makefile | 16 | ||||
| -rw-r--r-- | scripts/Makefile.modpost | 14 |
3 files changed, 40 insertions, 6 deletions
diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt index 64c84e2d06c0..fba7bed6193a 100644 --- a/Documentation/kbuild/makefiles.txt +++ b/Documentation/kbuild/makefiles.txt @@ -41,6 +41,7 @@ This document describes the Linux kernel Makefiles. --- 6.8 Custom kbuild commands --- 6.9 Preprocessing linker scripts --- 6.10 Generic header files + --- 6.11 Post-link pass === 7 Kbuild syntax for exported headers --- 7.1 no-export-headers-y @@ -1251,6 +1252,21 @@ When kbuild executes, the following steps are followed (roughly): For example, powerpc uses this to check relocation sanity of the linked vmlinux file. +--- 6.11 Post-link pass + + If the file arch/xxx/Makefile.postlink exists, this makefile + will be invoked for post-link objects (vmlinux and modules.ko) + for architectures to run post-link passes on. Must also handle + the clean target. + + This pass runs after kallsyms generation. If the architecture + needs to modify symbol locations, rather than manipulate the + kallsyms, it may be easier to add another postlink target for + .tmp_vmlinux? targets to be called from link-vmlinux.sh. + + For example, powerpc uses this to check relocation sanity of + the linked vmlinux file. + === 7 Kbuild syntax for exported headers The kernel includes a set of headers that is exported to userspace. @@ -1007,8 +1007,13 @@ export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Doc vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) +ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) + # Final link of vmlinux - cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) + cmd_link-vmlinux = \ + $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux); \ + $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) + quiet_cmd_link-vmlinux = LINK $@ # Include targets which we want to @@ -1026,8 +1031,16 @@ endif ifdef CONFIG_GDB_SCRIPTS $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py endif +ifdef CONFIG_TRIM_UNUSED_KSYMS + $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ + "$(MAKE) KBUILD_MODULES=1 -f $(srctree)/Makefile vmlinux_prereq" +endif +$(call if_changed,link-vmlinux) +# standalone target for easier testing +include/generated/autoksyms.h: FORCE + $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true + # The actual objects are generated when descending, # make sure no implicit rule kicks in $(sort $(vmlinux-deps)): $(vmlinux-dirs) ; @@ -1303,6 +1316,7 @@ $(clean-dirs): vmlinuxclean: $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean + $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) clean: archclean vmlinuxclean diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost index 7718a64b1cd1..8cb7971b3f25 100644 --- a/scripts/Makefile.modpost +++ b/scripts/Makefile.modpost @@ -115,14 +115,18 @@ $(modules:.ko=.mod.o): %.mod.o: %.mod.c FORCE targets += $(modules:.ko=.mod.o) -# Step 6), final link of the modules +ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) + +# Step 6), final link of the modules with optional arch pass after final link quiet_cmd_ld_ko_o = LD [M] $@ - cmd_ld_ko_o = $(LD) -r $(LDFLAGS) \ - $(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE) \ - -o $@ $(filter-out FORCE,$^) + cmd_ld_ko_o = \ + $(LD) -r $(LDFLAGS) \ + $(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE) \ + -o $@ $(filter-out FORCE,$^) ; \ + $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) $(modules): %.ko :%.o %.mod.o FORCE - $(call if_changed,ld_ko_o) + +$(call if_changed,ld_ko_o) targets += $(modules) |