Messages in this thread Patch in this message | | | Date | Thu, 24 Sep 2009 11:35:36 -0400 | From | Mathieu Desnoyers <> | Subject | Re: [patch 10.2/12] Fix Immediate Values x86_64 support old gcc |
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GCC < 4, on x86_64, does not accept symbol+offset operands for "i" constraints asm statements. Fallback on a memory read in lieue of immediate value if this compiler is detected.
Changelog : - USE_IMMEDIATE must now be used in lieue of CONFIG_IMMEDIATE in Makefiles and in C code. - Every architecture implementing immediate values must declare USE_IMMEDIATE in their Makefile. - Tab -> spaces in Makefiles.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Acked-by: Sam Ravnborg <sam@ravnborg.org> CC: "H. Peter Anvin" <hpa@zytor.com> CC: Jeremy Fitzhardinge <jeremy@goop.org> CC: Ingo Molnar <mingo@elte.hu> CC: David Miller <davem@davemloft.net> CC: Paul Mackerras <paulus@samba.org> --- Makefile | 5 +++++ arch/powerpc/Makefile | 2 ++ arch/x86/Makefile | 5 +++++ include/linux/immediate.h | 2 +- include/linux/module.h | 2 +- kernel/Makefile | 2 +- kernel/module.c | 6 +++--- 7 files changed, 18 insertions(+), 6 deletions(-)
Index: linux.trees.git/arch/x86/Makefile =================================================================== --- linux.trees.git.orig/arch/x86/Makefile 2009-09-24 08:52:41.000000000 -0400 +++ linux.trees.git/arch/x86/Makefile 2009-09-24 10:53:59.000000000 -0400 @@ -41,6 +41,7 @@ ifeq ($(CONFIG_X86_32),y) # temporary until string.h is fixed KBUILD_CFLAGS += -ffreestanding + export USE_IMMEDIATE := $(CONFIG_IMMEDIATE) else BITS := 64 UTS_MACHINE := x86_64 @@ -70,6 +71,10 @@ else # this works around some issues with generating unwind tables in older gccs # newer gccs do it by default KBUILD_CFLAGS += -maccumulate-outgoing-args + + # x86_64 gcc 3.x has problems with passing symbol+offset in + # asm "i" constraint. + export USE_IMMEDIATE := $(call cc-ifversion, -ge, 0400, $(CONFIG_IMMEDIATE)) endif ifdef CONFIG_CC_STACKPROTECTOR Index: linux.trees.git/include/linux/immediate.h =================================================================== --- linux.trees.git.orig/include/linux/immediate.h 2009-09-24 10:53:51.000000000 -0400 +++ linux.trees.git/include/linux/immediate.h 2009-09-24 10:53:59.000000000 -0400 @@ -10,7 +10,7 @@ * See the file COPYING for more details. */ -#ifdef CONFIG_IMMEDIATE +#ifdef USE_IMMEDIATE struct __imv { unsigned long var; /* Pointer to the identifier variable of the Index: linux.trees.git/kernel/Makefile =================================================================== --- linux.trees.git.orig/kernel/Makefile 2009-09-24 09:20:19.000000000 -0400 +++ linux.trees.git/kernel/Makefile 2009-09-24 10:55:09.000000000 -0400 @@ -88,7 +88,7 @@ obj-$(CONFIG_SYSCTL) += utsname_sysctl.o obj-$(CONFIG_TASK_DELAY_ACCT) += delayacct.o obj-$(CONFIG_TASKSTATS) += taskstats.o tsacct.o obj-$(CONFIG_TRACEPOINTS) += tracepoint.o -obj-$(CONFIG_IMMEDIATE) += immediate.o +obj-$(USE_IMMEDIATE) += immediate.o obj-$(CONFIG_LATENCYTOP) += latencytop.o obj-$(CONFIG_FUNCTION_TRACER) += trace/ obj-$(CONFIG_TRACING) += trace/ Index: linux.trees.git/arch/powerpc/Makefile =================================================================== --- linux.trees.git.orig/arch/powerpc/Makefile 2009-09-24 08:52:40.000000000 -0400 +++ linux.trees.git/arch/powerpc/Makefile 2009-09-24 10:53:59.000000000 -0400 @@ -96,6 +96,8 @@ else LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o endif +export USE_IMMEDIATE := $(CONFIG_IMMEDIATE) + ifeq ($(CONFIG_TUNE_CELL),y) KBUILD_CFLAGS += $(call cc-option,-mtune=cell) endif Index: linux.trees.git/Makefile =================================================================== --- linux.trees.git.orig/Makefile 2009-09-24 08:52:38.000000000 -0400 +++ linux.trees.git/Makefile 2009-09-24 10:53:59.000000000 -0400 @@ -550,6 +550,11 @@ ifdef CONFIG_FUNCTION_TRACER KBUILD_CFLAGS += -pg endif +# arch Makefile detects if the compiler permits use of immediate values +ifdef USE_IMMEDIATE +KBUILD_CFLAGS += -DUSE_IMMEDIATE +endif + # We trigger additional mismatches with less inlining ifdef CONFIG_DEBUG_SECTION_MISMATCH KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once) Index: linux.trees.git/kernel/module.c =================================================================== --- linux.trees.git.orig/kernel/module.c 2009-09-24 09:20:37.000000000 -0400 +++ linux.trees.git/kernel/module.c 2009-09-24 10:53:59.000000000 -0400 @@ -2237,7 +2237,7 @@ static noinline struct module *load_modu mod->ctors = section_objs(hdr, sechdrs, secstrings, ".ctors", sizeof(*mod->ctors), &mod->num_ctors); #endif -#ifdef CONFIG_IMMEDIATE +#ifdef USE_IMMEDIATE mod->immediate = section_objs(hdr, sechdrs, secstrings, "__imv", sizeof(*mod->immediate), &mod->num_immediate); @@ -2491,7 +2491,7 @@ SYSCALL_DEFINE3(init_module, void __user mutex_lock(&module_mutex); /* Drop initial reference. */ module_put(mod); -#ifdef CONFIG_IMMEDIATE +#ifdef USE_IMMEDIATE imv_unref(mod->immediate, mod->immediate + mod->num_immediate, mod->module_init, mod->init_size); #endif @@ -3011,7 +3011,7 @@ int module_get_iter_tracepoints(struct t } #endif -#ifdef CONFIG_IMMEDIATE +#ifdef USE_IMMEDIATE /** * _module_imv_update - update all immediate values in the kernel * Index: linux.trees.git/include/linux/module.h =================================================================== --- linux.trees.git.orig/include/linux/module.h 2009-09-24 10:53:51.000000000 -0400 +++ linux.trees.git/include/linux/module.h 2009-09-24 10:53:59.000000000 -0400 @@ -660,7 +660,7 @@ static inline int module_get_iter_tracep #endif /* CONFIG_MODULES */ -#if defined(CONFIG_MODULES) && defined(CONFIG_IMMEDIATE) +#if defined(CONFIG_MODULES) && defined(USE_IMMEDIATE) extern void _module_imv_update(void); extern void module_imv_update(void); #else
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