kbuild: add CONFIG_ASM_MODVERSIONS

Add CONFIG_ASM_MODVERSIONS. This allows to remove one if-conditional
nesting in scripts/Makefile.build.

scripts/Makefile.build is run every time Kbuild descends into a
sub-directory. So, I want to avoid $(wildcard ...) evaluation
where possible although computing $(wildcard ...) is so cheap that
it may not make measurable performance difference.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/arch/Kconfig b/arch/Kconfig
index a7b57dd42c26..7d7b1b6af851 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -289,6 +289,13 @@ config ARCH_32BIT_OFF_T
           still support 32-bit off_t. This option is enabled for all such
           architectures explicitly.
 
+config HAVE_ASM_MODVERSIONS
+        bool
+        help
+          This symbol should be selected by an architecure if it provides
+          <asm/asm-prototypes.h> to support the module versioning for symbols
+          exported from assembly code.
+
 config HAVE_REGS_AND_STACK_ACCESS_API
         bool
         help