[PATCH] MIPS: VDSO: Conditionally export __vdso_gettimeofday()

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ld.lld 16.0.0 and newer defaults to '--no-undefined-version', which
causes the following error when CONFIG_MIPS_CLOCK_VSYSCALL is not set:

  ld.lld: error: version script assignment of 'LINUX_2.6' to symbol '__vdso_gettimeofday' failed: symbol not defined

Only export __vdso_gettimeofday() when it will be present in the final
object file, which clears up the error.

Reported-by: kernel test robot <lkp@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-kbuild-all/202308170532.zxFFv25c-lkp@xxxxxxxxx/
Signed-off-by: Nathan Chancellor <nathan@xxxxxxxxxx>
 arch/mips/vdso/vdso.lds.S | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/mips/vdso/vdso.lds.S b/arch/mips/vdso/vdso.lds.S
index d90b65724d78..836465e3bcb8 100644
--- a/arch/mips/vdso/vdso.lds.S
+++ b/arch/mips/vdso/vdso.lds.S
@@ -94,7 +94,9 @@ VERSION

base-commit: 2ccdd1b13c591d306f0401d98dedc4bdcd02b421
change-id: 20230816-mips-vdso-cond-export-__vdso_gettimeofday-30ab92c716d4

Best regards,
Nathan Chancellor <nathan@xxxxxxxxxx>

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