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| author | Andrea Righi <andrea.righi@canonical.com> | 2022-07-14 10:49:15 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2022-08-04 13:23:50 +0300 |
| commit | de979c83574abf6e78f3fa65b716515c91b2613d (patch) | |
| tree | c4ec84ab81c6550691e091fd4b414a618381b436 /arch/x86/um/Makefile | |
| parent | 625395c4a0f4775e0fe00f616888d2e6c1ba49db (diff) | |
| download | linux-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_$(BITS).o only if
CONFIG_PREEMPTION is enabled.
BugLink: https://bugs.launchpad.net/bugs/1911359
Fixes: 320100a5ffe5 ("x86/entry: Remove the TRACE_IRQS cruft")
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/Ys/Ke7EWjcX+ZlXO@arighi-desktop
Diffstat (limited to 'arch/x86/um/Makefile')
| -rw-r--r-- | arch/x86/um/Makefile | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/um/Makefile b/arch/x86/um/Makefile index ba5789c35809..a8cde4e8ab11 100644 --- a/arch/x86/um/Makefile +++ b/arch/x86/um/Makefile @@ -28,7 +28,8 @@ else obj-y += syscalls_64.o vdso/ -subarch-y = ../lib/csum-partial_64.o ../lib/memcpy_64.o ../entry/thunk_64.o +subarch-y = ../lib/csum-partial_64.o ../lib/memcpy_64.o +subarch-$(CONFIG_PREEMPTION) += ../entry/thunk_64.o endif |