From: Tiwei Bie <tiwei.btw@antgroup.com>
Currently, asm/percpu.h is directly or indirectly included by
some assembly files on x86. Some of them (e.g., checksum_32.S)
are also used on um. But x86 and um provide different versions
of asm/percpu.h -- um uses asm-generic/percpu.h directly.
When SMP is enabled, asm-generic/percpu.h will introduce C code
that cannot be assembled. Since asm-generic/percpu.h currently
is not designed for use in assembly, and these assembly files
do not actually need asm/percpu.h on um, let's add the assembly
guard in asm-generic/percpu.h to fix this issue.
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: linux-arch@vger.kernel.org
Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
---
include/asm-generic/percpu.h | 3 +++
1 file changed, 3 insertions(+)
diff --git a/include/asm-generic/percpu.h b/include/asm-generic/percpu.h
index 02aeca21479a..6628670bcb90 100644
--- a/include/asm-generic/percpu.h
+++ b/include/asm-generic/percpu.h
@@ -2,6 +2,8 @@
#ifndef _ASM_GENERIC_PERCPU_H_
#define _ASM_GENERIC_PERCPU_H_
+#ifndef __ASSEMBLER__
+
#include <linux/compiler.h>
#include <linux/threads.h>
#include <linux/percpu-defs.h>
@@ -557,4 +559,5 @@ do { \
this_cpu_generic_cmpxchg(pcp, oval, nval)
#endif
+#endif /* __ASSEMBLER__ */
#endif /* _ASM_GENERIC_PERCPU_H_ */
--
2.34.1