powerpc/vdso: Emit GNU & SysV hashes

Andy Lutomirski says:

  Some dynamic loaders may be slightly faster if a GNU hash is
  available.

  This is unlikely to have any measurable effect on the time it takes
  to resolve vdso symbols (since there are so few of them).  In some
  contexts, it can be a win for a different reason: if every DSO has a
  GNU hash section, then libc can avoid calculating SysV hashes at
  all. Both musl and glibc appear to have this optimization.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/kernel/vdso32/Makefile b/arch/powerpc/kernel/vdso32/Makefile
index 53e6c9b979ec6bd44d4892f62b281e5a4c0906b3..6abffb7a8cd987358a2a8c6af0b26c7c0aa323e8 100644 (file)
--- a/arch/powerpc/kernel/vdso32/Makefile
+++ b/arch/powerpc/kernel/vdso32/Makefile
@@ -18,7 +18,7 @@ GCOV_PROFILE := n
 
 ccflags-y := -shared -fno-common -fno-builtin
 ccflags-y += -nostdlib -Wl,-soname=linux-vdso32.so.1 \
-               $(call cc-ldoption, -Wl$(comma)--hash-style=sysv)
+               $(call cc-ldoption, -Wl$(comma)--hash-style=both)
 asflags-y := -D__VDSO32__ -s
 
 obj-y += vdso32_wrapper.o

diff --git a/arch/powerpc/kernel/vdso64/Makefile b/arch/powerpc/kernel/vdso64/Makefile
index effca9404b1763c077ff0dcde9e2910ded4c0423..8c8f2ae43935600388116ac69b28756244c260be 100644 (file)
--- a/arch/powerpc/kernel/vdso64/Makefile
+++ b/arch/powerpc/kernel/vdso64/Makefile
@@ -11,7 +11,7 @@ GCOV_PROFILE := n
 
 ccflags-y := -shared -fno-common -fno-builtin
 ccflags-y += -nostdlib -Wl,-soname=linux-vdso64.so.1 \
-               $(call cc-ldoption, -Wl$(comma)--hash-style=sysv)
+               $(call cc-ldoption, -Wl$(comma)--hash-style=both)
 asflags-y := -D__VDSO64__ -s
 
 obj-y += vdso64_wrapper.o