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authorAndrea Righi <andrea.righi@canonical.com>2022-07-14 10:49:15 +0300
committerIngo Molnar <mingo@kernel.org>2022-08-04 13:23:50 +0300
commitde979c83574abf6e78f3fa65b716515c91b2613d (patch)
treec4ec84ab81c6550691e091fd4b414a618381b436 /arch/x86/um/Makefile
parent625395c4a0f4775e0fe00f616888d2e6c1ba49db (diff)
downloadlinux-de979c83574abf6e78f3fa65b716515c91b2613d.tar.xz
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_$(BITS).o only if CONFIG_PREEMPTION is enabled. BugLink: https://bugs.launchpad.net/bugs/1911359 Fixes: 320100a5ffe5 ("x86/entry: Remove the TRACE_IRQS cruft") Signed-off-by: Andrea Righi <andrea.righi@canonical.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/Ys/Ke7EWjcX+ZlXO@arighi-desktop
Diffstat (limited to 'arch/x86/um/Makefile')
-rw-r--r--arch/x86/um/Makefile3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/um/Makefile b/arch/x86/um/Makefile
index ba5789c35809..a8cde4e8ab11 100644
--- a/arch/x86/um/Makefile
+++ b/arch/x86/um/Makefile
@@ -28,7 +28,8 @@ else
obj-y += syscalls_64.o vdso/
-subarch-y = ../lib/csum-partial_64.o ../lib/memcpy_64.o ../entry/thunk_64.o
+subarch-y = ../lib/csum-partial_64.o ../lib/memcpy_64.o
+subarch-$(CONFIG_PREEMPTION) += ../entry/thunk_64.o
endif