linux - 在 Linux 内核中， header 包含错误

Question

当我在内核的源代码中包含“asm/xen/hypercall.h”时，

我收到一条错误消息。我该如何解决？

 include/linux/stddef.h:8:16: error: expected identifier or '(' before 'void'
 #define NULL ((void *)0)
                ^
./arch/x86/include/asm/alternative.h:221:28: note: in expansion of macro 'NULL'
 #define __parainstructions NULL
                            ^
./arch/x86/include/asm/paravirt_types.h:703:35: note: in expansion of macro '__parainstructions'
 extern struct paravirt_patch_site __parainstructions[],
                                   ^
include/linux/stddef.h:8:23: error: expected ')' before numeric constant
 #define NULL ((void *)0)
                       ^
./arch/x86/include/asm/alternative.h:221:28: note: in expansion of macro 'NULL'
 #define __parainstructions NULL
                            ^
./arch/x86/include/asm/paravirt_types.h:703:35: note: in expansion of macro '__parainstructions'
 extern struct paravirt_patch_site __parainstructions[],
                                   ^
scripts/Makefile.build:257: recipe for target 'drivers/oxen/fallback.o' failed

Answer 1

XEN 功能依赖于 PARAVIRT(参见 arch/x86/xen/Kconfig)。

但行

#define __parainstructions NULL

at arch/x86/include/asm/alternative.h:221 仅在 PARAVIRT 被禁用时执行。因此，在这种情况下，您不应该使用 XEN header 。