[PATCH] MIPS: VDSO: Fix binutils version test

[Tony Wu <tung7970@gmail.com>]

Commit 2a037f310bab ("MIPS: VDSO: Fix build error") fixed the logic
for testing binutils version, but introduced another issue.

The ld-ifversion macro is defined as follows:

  $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4))

This macro checks ld version to echo $(3) or echo $(4) based on
the given condition.

It is called as follows in arch/mips/vdso/Makefile:

  ifeq ($(call ld-ifversion, -lt, 22500000, y),)
    $(warning MIPS VDSO requires binutils >= 2.25)
    obj-vdso-y := $(filter-out gettimeofday.o, $(obj-vdso-y))
    ccflags-vdso += -DDISABLE_MIPS_VDSO
  endif

Since $(4) is empty, echo $(4) will evaluate to a simple 'echo'. So, in
case binutils version is indeed greater than 2.25.0, ld-ifversion macro
will return a newline, not the empty string as expected, and that makes
the test fail.

This patch fixes the test condition.

Signed-off-by: Tony Wu <tung7970@gmail.com>
Cc: Qais Yousef <qais.yousef@imgtec.com>
Cc: Alex Smith <alex@alex-smith.me.uk>

diff --git a/arch/mips/vdso/Makefile b/arch/mips/vdso/Makefile
index 018f8c7..a54a082 100644
--- a/arch/mips/vdso/Makefile
+++ b/arch/mips/vdso/Makefile
@@ -26,7 +26,7 @@ aflags-vdso := $(ccflags-vdso) \
 # the comments on that file.
 #
 ifndef CONFIG_CPU_MIPSR6
-  ifeq ($(call ld-ifversion, -lt, 22500000, y),)
+  ifneq ($(call ld-ifversion,-ge,22500000,y),y)
     $(warning MIPS VDSO requires binutils >= 2.25)
     obj-vdso-y := $(filter-out gettimeofday.o, $(obj-vdso-y))
     ccflags-vdso += -DDISABLE_MIPS_VDSO