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Subject[tip: x86/urgent] x86/entry: Build thunk_$(BITS) only if CONFIG_PREEMPTION=y
The following commit has been merged into the x86/urgent branch of tip:

Commit-ID: de979c83574abf6e78f3fa65b716515c91b2613d
Gitweb: https://git.kernel.org/tip/de979c83574abf6e78f3fa65b716515c91b2613d
Author: Andrea Righi <andrea.righi@canonical.com>
AuthorDate: Thu, 14 Jul 2022 09:49:15 +02:00
Committer: Ingo Molnar <mingo@kernel.org>
CommitterDate: Thu, 04 Aug 2022 12:23:50 +02:00

x86/entry: Build thunk_$(BITS) only if CONFIG_PREEMPTION=y

With CONFIG_PREEMPTION disabled, arch/x86/entry/thunk_$(BITS).o becomes
an empty object file.

With some old versions of binutils (i.e., 2.35.90.20210113-1ubuntu1) the
GNU assembler doesn't generate a symbol table for empty object files and
objtool fails with the following error when a valid symbol table cannot
be found:

arch/x86/entry/thunk_64.o: warning: objtool: missing symbol table

To prevent this from happening, build thunk_$(BITS).o only if
CONFIG_PREEMPTION is enabled.

BugLink: https://bugs.launchpad.net/bugs/1911359

Fixes: 320100a5ffe5 ("x86/entry: Remove the TRACE_IRQS cruft")
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/Ys/Ke7EWjcX+ZlXO@arighi-desktop
---
arch/x86/entry/Makefile | 3 ++-
arch/x86/entry/thunk_32.S | 2 --
arch/x86/entry/thunk_64.S | 4 ----
arch/x86/um/Makefile | 3 ++-
4 files changed, 4 insertions(+), 8 deletions(-)

diff --git a/arch/x86/entry/Makefile b/arch/x86/entry/Makefile
index eeadbd7..ca2fe18 100644
--- a/arch/x86/entry/Makefile
+++ b/arch/x86/entry/Makefile
@@ -11,12 +11,13 @@ CFLAGS_REMOVE_common.o = $(CC_FLAGS_FTRACE)

CFLAGS_common.o += -fno-stack-protector

-obj-y := entry.o entry_$(BITS).o thunk_$(BITS).o syscall_$(BITS).o
+obj-y := entry.o entry_$(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

diff --git a/arch/x86/entry/thunk_32.S b/arch/x86/entry/thunk_32.S
index 7591bab..ff6e700 100644
--- a/arch/x86/entry/thunk_32.S
+++ b/arch/x86/entry/thunk_32.S
@@ -29,10 +29,8 @@ SYM_CODE_START_NOALIGN(\name)
SYM_CODE_END(\name)
.endm

-#ifdef CONFIG_PREEMPTION
THUNK preempt_schedule_thunk, preempt_schedule
THUNK preempt_schedule_notrace_thunk, preempt_schedule_notrace
EXPORT_SYMBOL(preempt_schedule_thunk)
EXPORT_SYMBOL(preempt_schedule_notrace_thunk)
-#endif

diff --git a/arch/x86/entry/thunk_64.S b/arch/x86/entry/thunk_64.S
index 505b488..f38b07d 100644
--- a/arch/x86/entry/thunk_64.S
+++ b/arch/x86/entry/thunk_64.S
@@ -31,14 +31,11 @@ SYM_FUNC_END(\name)
_ASM_NOKPROBE(\name)
.endm

-#ifdef CONFIG_PREEMPTION
THUNK preempt_schedule_thunk, preempt_schedule
THUNK preempt_schedule_notrace_thunk, preempt_schedule_notrace
EXPORT_SYMBOL(preempt_schedule_thunk)
EXPORT_SYMBOL(preempt_schedule_notrace_thunk)
-#endif

-#ifdef CONFIG_PREEMPTION
SYM_CODE_START_LOCAL_NOALIGN(__thunk_restore)
popq %r11
popq %r10
@@ -53,4 +50,3 @@ SYM_CODE_START_LOCAL_NOALIGN(__thunk_restore)
RET
_ASM_NOKPROBE(__thunk_restore)
SYM_CODE_END(__thunk_restore)
-#endif
diff --git a/arch/x86/um/Makefile b/arch/x86/um/Makefile
index ba5789c..a8cde4e 100644
--- a/arch/x86/um/Makefile
+++ b/arch/x86/um/Makefile
@@ -28,7 +28,8 @@ else

obj-y += syscalls_64.o vdso/

-subarch-y = ../lib/csum-partial_64.o ../lib/memcpy_64.o ../entry/thunk_64.o
+subarch-y = ../lib/csum-partial_64.o ../lib/memcpy_64.o
+subarch-$(CONFIG_PREEMPTION) += ../entry/thunk_64.o

endif

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