From 4b058c9f281f5b100efbf665dd5a1a05e1654d6d Mon Sep 17 00:00:00 2001 From: "Jason A. Donenfeld" Date: Wed, 25 Sep 2024 19:50:22 +0200 Subject: [PATCH] powerpc/vdso: allow r30 in vDSO code generation of getrandom For gettimeofday, -ffixed-r30 was passed to work around a bug in Go code, where the vDSO trampoline forgot to save and restore this register across function calls. But Go requires a different trampoline for every call, and there's no reason that new Go code needs to be broken and add more bugs. So remove -ffixed-r30 for getrandom. Fixes: 8072b39c3a75 ("powerpc/vdso: Wire up getrandom() vDSO implementation on VDSO64") Signed-off-by: Jason A. Donenfeld Signed-off-by: Michael Ellerman Link: https://msgid.link/20240925175021.1526936-2-Jason@zx2c4.com --- arch/powerpc/kernel/vdso/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/vdso/Makefile b/arch/powerpc/kernel/vdso/Makefile index 56fb1633529a..31ca5a547004 100644 --- a/arch/powerpc/kernel/vdso/Makefile +++ b/arch/powerpc/kernel/vdso/Makefile @@ -22,7 +22,7 @@ endif ifneq ($(c-getrandom-y),) CFLAGS_vgetrandom-32.o += -include $(c-getrandom-y) - CFLAGS_vgetrandom-64.o += -include $(c-getrandom-y) $(call cc-option, -ffixed-r30) + CFLAGS_vgetrandom-64.o += -include $(c-getrandom-y) endif # Build rules