linux-kernel - [PATCH] x86: Include thunk_$(BITS).o only if CONFIG

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Message-Id: <20201228032646.341547-1-hjl.tools@gmail.com>
Date:   Sun, 27 Dec 2020 19:26:46 -0800
From:   "H.J. Lu" <hjl.tools@...il.com>
To:     linux-kernel@...r.kernel.org
Subject: [PATCH] x86: Include thunk_$(BITS).o only if CONFIG_PREEMPTION=y

The newer GNU assembler may not generate a symbol table for the empty
object file.  Since objtool doesn't like empty object files without
symbol table and thunk_$(BITS).o doesn't have a symbol table when
CONFIG_PREEMPTION isn't enabled, include thunk_$(BITS).o only if
CONFIG_PREEMPTION is enabled.

Signed-off-by: H.J. Lu <hjl.tools@...il.com>
---
 arch/x86/entry/Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/entry/Makefile b/arch/x86/entry/Makefile
index 08bf95dbc911..83c98dae74a6 100644
--- a/arch/x86/entry/Makefile
+++ b/arch/x86/entry/Makefile
@@ -21,12 +21,13 @@ CFLAGS_syscall_64.o		+= $(call cc-option,-Wno-override-init,)
 CFLAGS_syscall_32.o		+= $(call cc-option,-Wno-override-init,)
 CFLAGS_syscall_x32.o		+= $(call cc-option,-Wno-override-init,)
 
-obj-y				:= entry_$(BITS).o thunk_$(BITS).o syscall_$(BITS).o
+obj-y				:= entry_$(BITS).o syscall_$(BITS).o
 obj-y				+= common.o
 
 obj-y				+= vdso/
 obj-y				+= vsyscall/
 
+obj-$(CONFIG_PREEMPTION)	+= thunk_$(BITS).o
 obj-$(CONFIG_IA32_EMULATION)	+= entry_64_compat.o syscall_32.o
 obj-$(CONFIG_X86_X32_ABI)	+= syscall_x32.o
 
-- 
2.29.2