From 787b393c9f6300c343600d39f53f1b9f09d3684f Mon Sep 17 00:00:00 2001 From: Michael Ellerman Date: Fri, 7 Aug 2015 13:05:42 +1000 Subject: [PATCH] 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 --- arch/powerpc/kernel/vdso32/Makefile | 2 +- arch/powerpc/kernel/vdso64/Makefile | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/kernel/vdso32/Makefile b/arch/powerpc/kernel/vdso32/Makefile index 53e6c9b979ec..6abffb7a8cd9 100644 --- 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 effca9404b17..8c8f2ae43935 100644 --- 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 -- 2.20.1