arm64: compat: Remove 32-bit sigreturn code from the vDSO

The sigreturn code in the compat vDSO is unused. Remove it.

Reviewed-by: Vincenzo Frascino <[email protected]>
Reviewed-by: Ard Biesheuvel <[email protected]>
Reviewed-by: Mark Rutland <[email protected]>
Signed-off-by: Will Deacon <[email protected]>

Author: willdeacon

arch/arm64/kernel/vdso32/Makefile

@@ -140,7 +140,6 @@ hostprogs := $(munge)
 
 c-obj-vdso := note.o
 c-obj-vdso-gettimeofday := vgettimeofday.o
-asm-obj-vdso := sigreturn.o
 
 ifneq ($(c-gettimeofday-y),)
 VDSO_CFLAGS_gettimeofday_o += -include $(c-gettimeofday-y)

arch/arm64/kernel/vdso32/sigreturn.S

@@ -64,19 +64,7 @@ VERSION
 		__vdso_clock_gettime;
 		__vdso_gettimeofday;
 		__vdso_clock_getres;
-		__kernel_sigreturn_arm;
-		__kernel_sigreturn_thumb;
-		__kernel_rt_sigreturn_arm;
-		__kernel_rt_sigreturn_thumb;
 		__vdso_clock_gettime64;
 	local: *;
 	};
 }
-
-/*
- * Make the sigreturn code visible to the kernel.
- */
-VDSO_compat_sigreturn_arm	= __kernel_sigreturn_arm;
-VDSO_compat_sigreturn_thumb	= __kernel_sigreturn_thumb;
-VDSO_compat_rt_sigreturn_arm	= __kernel_rt_sigreturn_arm;
-VDSO_compat_rt_sigreturn_thumb	= __kernel_rt_sigreturn_thumb;