+ x86-kallsyms-disable-absolute-percpu-symbols-on-smp.patch added to -mm tree

+ x86-kallsyms-disable-absolute-percpu-symbols-on-smp.patch added to -mm tree

[akpm]

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@linaro.org>
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@linaro.org>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au> # powerpc
Cc: Kees Cook <keescook@chromium.org> # x86_64
Cc: Ingo Molnar <mingo@kernel.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Michal Marek <mmarek@suse.cz>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 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@linaro.org 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