From f83b5e323f57d6e1f35a839d663e91cebe985e54 Mon Sep 17 00:00:00 2001 From: Ustyugov Roman Date: Fri, 23 Sep 2005 08:42:11 +0400 Subject: [PATCH] kbuild: set correct KBUILD_MODNAME when using well known kernel symbols as module names This patch fixes a problem when we use well known kernel symbols as module names. For example, if module source name is current.c, idle_stack.c or etc., we have a bad KBUILD_MODNAME value. For example, KBUILD_MODNAME will be "get_current()" instead of "current", or "(init_thread_union.stack)" instead of "idle_task". The trick is to define a stringify macro on the commandline - named KBUILD_STR for namespace reasons - and then to stringify the module name. There are a few uses of KBUILD_MODNAME throughout the tree but the usage is for debug and will not be harmed by this change so left untouched for now. While at it KBUILD_BASENAME was changed too. Any spinlock usage in the unix module would have created wrong section names without it. Usage in spinlock.h fixed so it no longer stringify KBUILD_BASENAME. Original patch from Ustyogov Roman - all bugs introduced by me. Signed-off-by: Sam Ravnborg --- include/linux/spinlock.h | 3 +-- scripts/Makefile.lib | 8 +++++--- scripts/mod/modpost.c | 3 +-- 3 files changed, 7 insertions(+), 7 deletions(-) diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h index 0e9682c9def..799be674794 100644 --- a/include/linux/spinlock.h +++ b/include/linux/spinlock.h @@ -59,8 +59,7 @@ /* * Must define these before including other files, inline functions need them */ -#define LOCK_SECTION_NAME \ - ".text.lock." __stringify(KBUILD_BASENAME) +#define LOCK_SECTION_NAME ".text.lock."KBUILD_BASENAME #define LOCK_SECTION_START(extra) \ ".subsection 1\n\t" \ diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib index 0f81dcfd690..550798f57da 100644 --- a/scripts/Makefile.lib +++ b/scripts/Makefile.lib @@ -81,8 +81,10 @@ obj-dirs := $(addprefix $(obj)/,$(obj-dirs)) # Note: It's possible that one object gets potentially linked into more # than one module. In that case KBUILD_MODNAME will be set to foo_bar, # where foo and bar are the name of the modules. -basename_flags = -DKBUILD_BASENAME=$(subst $(comma),_,$(subst -,_,$(*F))) -modname_flags = $(if $(filter 1,$(words $(modname))),-DKBUILD_MODNAME=$(subst $(comma),_,$(subst -,_,$(modname)))) +name-fix = $(subst $(comma),_,$(subst -,_,$1)) +basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(*F)))" +modname_flags = $(if $(filter 1,$(words $(modname))),\ + -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))") _c_flags = $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$(*F).o) _a_flags = $(AFLAGS) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o) @@ -113,7 +115,7 @@ endif c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(CPPFLAGS) \ $(__c_flags) $(modkern_cflags) \ - $(basename_flags) $(modname_flags) + -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags) a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(CPPFLAGS) \ $(__a_flags) $(modkern_aflags) diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index 8ce5a631868..f70ff13d481 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -539,10 +539,9 @@ add_header(struct buffer *b, struct module *mod) buf_printf(b, "\n"); buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n"); buf_printf(b, "\n"); - buf_printf(b, "#undef unix\n"); /* We have a module called "unix" */ buf_printf(b, "struct module __this_module\n"); buf_printf(b, "__attribute__((section(\".gnu.linkonce.this_module\"))) = {\n"); - buf_printf(b, " .name = __stringify(KBUILD_MODNAME),\n"); + buf_printf(b, " .name = KBUILD_MODNAME,\n"); if (mod->has_init) buf_printf(b, " .init = init_module,\n"); if (mod->has_cleanup)