Re: 2.6.21-rc7-mm2 -- x86_64 VDSO compile error II

From: Mel Gorman
Date: Thu Apr 26 2007 - 11:20:59 EST

On (26/04/07 15:39), Mel Gorman didst pronounce:
> On (26/04/07 16:13), Andi Kleen didst pronounce:
> > On Thursday 26 April 2007 15:27:36 Mel Gorman wrote:
> > > On (26/04/07 13:16), Andy Whitcroft didst pronounce:
> > > > Getting the following on an x86_64 numa box:
> > > >
> > > > CC arch/x86_64/vdso/vclock_gettime.o
> > > > arch/x86_64/vdso/vclock_gettime.c:1: error: code model `small' not
> > > > supported in the 32 bit mode
> > > > make[1]: *** [arch/x86_64/vdso/vclock_gettime.o] Error 1
> > > > make: *** [arch/x86_64/vdso] Error 2
> > > >
> > > > Kernel config here: http://test.kernel.org/abat/85358/build/dotconfig
> > > >
> > >
> > > Hi Andi,
> > >
> > > Backing out x86_64-mm-vdso.patch allowed this kernel to build and boot
> > > successful on the machine in question (elm3b6). The backout caused one reject
> > > in Documentation/kernel-parameters but otherwise backed out easily. It's
> > > not super-clear why it fails to build. If you want me to try another patch,
> > > make sure I'm cc'd and I'll give it a spin.
> >
> >
> > Or please try this simple patch.
> >
> > -Andi
> >
> > Index: linux/arch/x86_64/vdso/Makefile
> > ===================================================================
> > --- linux.orig/arch/x86_64/vdso/Makefile
> > +++ linux/arch/x86_64/vdso/Makefile
> > @@ -32,7 +32,7 @@ $(obj)/vdso.o: $(src)/vdso.S $(obj)/vdso
> > $(obj)/vdso.so: $(src)/vdso.lds $(vobjs) FORCE
> > $(call if_changed,syscall)
> >
> > -CF := $(PROFILING) -mcmodel=small -fPIC -g0 -O2 -fasynchronous-unwind-tables
> > +CF := $(PROFILING) -mcmodel=small -fPIC -g0 -O2 -fasynchronous-unwind-tables -m64
> >
> > $(obj)/vclock_gettime.o: CFLAGS = $(CF)
> > $(obj)/vgetcpu.o: CFLAGS = $(CF)
>
> make -f scripts/Makefile.build obj=arch/x86_64/vdso
> gcc -Wp,-MD,arch/x86_64/vdso/.vma.o.d -nostdinc -isystem /usr/lib/gcc/i486-linux/3.4.4/include -D__KERNEL__ -Iinclude -include include/linux/autoconf.h -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Os -march=k8 -m64 -mno-red-zone -mcmodel=kernel -pipe -Wno-sign-compare -fno-asynchronous-unwind-tables -funit-at-a-time -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -maccumulate-outgoing-args -DCONFIG_AS_CFI=1 -fno-omit-frame-pointer -fno-optimize-sibling-calls -Wdeclaration-after-statement -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(vma)" -D"KBUILD_MODNAME=KBUILD_STR(vma)" -c -o arch/x86_64/vdso/vma.o arch/x86_64/vdso/vma.c
> gcc -Wp,-MD,arch/x86_64/vdso/.vdso-start.o.d -nostdinc -isystem /usr/lib/gcc/i486-linux/3.4.4/include -D__KERNEL__ -Iinclude -include include/linux/autoconf.h -D__ASSEMBLY__ -DCONFIG_AS_CFI=1 -m64 -c -o arch/x86_64/vdso/vdso-start.o arch/x86_64/vdso/vdso-start.S
> gcc -Wp,-MD,arch/x86_64/vdso/.vdso-note.o.d -nostdinc -isystem /usr/lib/gcc/i486-linux/3.4.4/include -D__KERNEL__ -Iinclude -include include/linux/autoconf.h -D__ASSEMBLY__ -DCONFIG_AS_CFI=1 -m64 -c -o arch/x86_64/vdso/vdso-note.o arch/x86_64/vdso/vdso-note.S
> gcc -Wp,-MD,arch/x86_64/vdso/.vclock_gettime.o.d -nostdinc -isystem /usr/lib/gcc/i486-linux/3.4.4/include -D__KERNEL__ -Iinclude -include include/linux/autoconf.h -mcmodel=small -fPIC -g0 -O2 -fasynchronous-unwind-tables -m64 -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(vclock_gettime)" -D"KBUILD_MODNAME=KBUILD_STR(vclock_gettime)" -c -o arch/x86_64/vdso/vclock_gettime.o arch/x86_64/vdso/vclock_gettime.c
> gcc -Wp,-MD,arch/x86_64/vdso/.vgetcpu.o.d -nostdinc -isystem /usr/lib/gcc/i486-linux/3.4.4/include -D__KERNEL__ -Iinclude -include include/linux/autoconf.h -mcmodel=small -fPIC -g0 -O2 -fasynchronous-unwind-tables -m64 -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(vgetcpu)" -D"KBUILD_MODNAME=KBUILD_STR(vgetcpu)" -c -o arch/x86_64/vdso/vgetcpu.o arch/x86_64/vdso/vgetcpu.c
> gcc -Wp,-MD,arch/x86_64/vdso/.vvar.o.d -nostdinc -isystem /usr/lib/gcc/i486-linux/3.4.4/include -D__KERNEL__ -Iinclude -include include/linux/autoconf.h -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Os -march=k8 -m64 -mno-red-zone -mcmodel=kernel -pipe -Wno-sign-compare -fno-asynchronous-unwind-tables -funit-at-a-time -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -maccumulate-outgoing-args -DCONFIG_AS_CFI=1 -fno-omit-frame-pointer -fno-optimize-sibling-calls -Wdeclaration-after-statement -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(vvar)" -D"KBUILD_MODNAME=KBUILD_STR(vvar)" -c -o arch/x86_64/vdso/vvar.o arch/x86_64/vdso/vvar.c
> gcc -m elf_x86_64 -nostdlib -fPIC -shared -Wl,-soname=linux-vdso.so.1 -Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096 -Wl,-T,arch/x86_64/vdso/vdso.lds arch/x86_64/vdso/vdso-start.o arch/x86_64/vdso/vdso-note.o arch/x86_64/vdso/vclock_gettime.o arch/x86_64/vdso/vgetcpu.o arch/x86_64/vdso/vvar.o -o arch/x86_64/vdso/vdso.so
> /usr/bin/ld: section .text [ffffffffff700400 -> ffffffffff700687] overlaps section .dynsym [ffffffffff7001d0 -> ffffffffff700427]
> collect2: ld returned 1 exit status
> make[1]: *** [arch/x86_64/vdso/vdso.so] Error 1
> make: *** [arch/x86_64/vdso] Error 2
>

If I add the following patch on top of yours, it builds and boots. It's
your call on whether it's a valid fix or not but it might point out the
Right Way to fix this

--- build/arch/x86_64/vdso/vdso.lds-orig 2007-04-26 08:18:19.000000000 -0700
+++ build/arch/x86_64/vdso/vdso.lds 2007-04-26 08:18:23.000000000 -0700
@@ -33,7 +33,7 @@
For the layouts to match, we need to skip more than enough
space for the dynamic symbol table et al. If this amount
is insufficient, ld -shared will barf. Just increase it here. */
- . = 0xffffffffff700000 + 0x500;
+ . = 0xffffffffff700000 + 0x400;

.text : { *(.text) } :text
.text.ptr : { *(.text.ptr) } :text
--
Mel Gorman
Part-time Phd Student Linux Technology Center
University of Limerick IBM Dublin Software Lab
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