um: kernel: ksyms: Export symbol syscall() for fixing modpost issue

syscall() is implemented in libc.so/a (e.g. for glibc, in "syscall.o"), so for normal ".o" files, it is undefined, neither can be found within kernel wide, so will break modpost.

Since ".o" files is OK, can simply export 'syscall' symbol, let modpost know about that, then can fix this issue.

The related error (with allmodconfig under um):

MODPOST 1205 modules
ERROR: "syscall" [fs/hostfs/hostfs.ko] undefined!

Signed-off-by Chen Gang <[email protected]>

---
 arch/um/kernel/ksyms.c | 3 +++
 1 file changed, 3 insertions(+)

arch/um/kernel/ksyms.c +3 -0

index 543c047..e7780f3 100644
@@ -42,3 +42,6 @@ EXPORT_SYMBOL(os_makedev);
 EXPORT_SYMBOL(add_sigio_fd);
 EXPORT_SYMBOL(ignore_sigio_fd);
 EXPORT_SYMBOL(sigio_broken);
+
+extern long int syscall (long int __sysno, ...);
+EXPORT_SYMBOL(syscall);

syscall() is implemented in libc.so/a (e.g. for glibc, in "syscall.o"), so for normal ".o" files, it is undefined, neither can be found within kernel wide, so will break modpost.

Since ".o" files is OK, can simply export 'syscall' symbol, let modpost know about that, then can fix this issue.

The related error (with allmodconfig under um):

MODPOST 1205 modules
ERROR: "syscall" [fs/hostfs/hostfs.ko] undefined!

Signed-off-by Chen Gang <[email protected]>

---
 arch/um/kernel/ksyms.c | 3 +++
 1 file changed, 3 insertions(+)

arch/um/kernel/ksyms.c +0 -0

index 543c047..e7780f3 100644