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x86: kallsyms: disable absolute percpu symbols on !SMP

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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 Kconfig symbol with the correct predicate,
and use that instead.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Kees Cook <keescook@chromium.org>
Tested-by: Kees Cook <keescook@chromium.org>
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
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: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ard Biesheuvel 2016-03-15 14:58:12 -07:00 committed by Linus Torvalds
parent 6b8c69e438
commit 4d5d5664c9
2 changed files with 5 additions and 1 deletions
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4
init/Kconfig
View File

@ -1420,6 +1420,10 @@ config KALLSYMS_ALL
Say N unless you really need all symbols.
config KALLSYMS_ABSOLUTE_PERCPU
bool
default X86_64 && SMP
config PRINTK
default y
bool "Enable support for printk" if EXPERT

2
scripts/link-vmlinux.sh
View File

@ -86,7 +86,7 @@ kallsyms()
kallsymopt="${kallsymopt} --page-offset=$CONFIG_PAGE_OFFSET"
fi
if [ -n "${CONFIG_X86_64}" ]; then
if [ -n "${CONFIG_KALLSYMS_ABSOLUTE_PERCPU}" ]; then
kallsymopt="${kallsymopt} --absolute-percpu"
fi