The patch titled
Subject: x86: kallsyms: disable absolute percpu symbols on !SMP
has been added to the -mm tree. Its filename is
x86-kallsyms-disable-absolute-percpu-symbols-on-smp.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/x86-kallsyms-disable-absolute-percpu-symbols-on-smp.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/x86-kallsyms-disable-absolute-percpu-symbols-on-smp.patch
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------------------------------------------------------
From: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Subject: x86: kallsyms: disable absolute percpu symbols on !SMP
scripts/kallsyms.c has a special --absolute-percpu command line option
which deals with the zero based per cpu offsets that are used when
building for SMP on x86_64. This means that the option should only be
passed in that case, so add a check for CONFIG_SMP. Otherwise, per cpu
variables are recorded as absolute quantities, (which they are not under
!CONFIG_SMP) and they are not relocated under CONFIG_RELOCATABLE=y.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Tested-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx> # powerpc
Cc: Kees Cook <keescook@xxxxxxxxxxxx> # x86_64
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Michal Marek <mmarek@xxxxxxx>
Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
scripts/link-vmlinux.sh | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN scripts/link-vmlinux.sh~x86-kallsyms-disable-absolute-percpu-symbols-on-smp scripts/link-vmlinux.sh
--- a/scripts/link-vmlinux.sh~x86-kallsyms-disable-absolute-percpu-symbols-on-smp
+++ a/scripts/link-vmlinux.sh
@@ -86,7 +86,7 @@ kallsyms()
kallsymopt="${kallsymopt} --page-offset=$CONFIG_PAGE_OFFSET"
fi
- if [ -n "${CONFIG_X86_64}" ]; then
+ if [ -n "${CONFIG_X86_64}" ] && [ -n "${CONFIG_SMP}" ]; then
kallsymopt="${kallsymopt} --absolute-percpu"
fi
_
Patches currently in -mm which might be from ard.biesheuvel@xxxxxxxxxx are
x86-kallsyms-disable-absolute-percpu-symbols-on-smp.patch
kallsyms-dont-overload-absolute-symbol-type-for-percpu-symbols.patch
kallsyms-add-support-for-relative-offsets-in-kallsyms-address-table.patch
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