[PATCH 3/5] um: remove file sync for stub data

[Benjamin Berg]

From: Benjamin Berg <benjamin.berg at intel.com>

There is no need to sync the stub code to "disk" for the other process
to see the correct memory. Drop the fsync there and remove the helper
function.
---
 arch/um/include/shared/os.h | 1 -
 arch/um/kernel/physmem.c    | 1 -
 arch/um/os-Linux/file.c     | 6 ------
 3 files changed, 8 deletions(-)

diff --git a/arch/um/include/shared/os.h b/arch/um/include/shared/os.h
index d709a24dc6fc..6c656ef096c9 100644
--- a/arch/um/include/shared/os.h
+++ b/arch/um/include/shared/os.h
@@ -145,7 +145,6 @@ extern int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg);
 extern int os_get_ifname(int fd, char *namebuf);
 extern int os_set_slip(int fd);
 extern int os_mode_fd(int fd, int mode);
-extern int os_fsync_file(int fd);
 
 extern int os_seek_file(int fd, unsigned long long offset);
 extern int os_open_file(const char *file, struct openflags flags, int mode);
diff --git a/arch/um/kernel/physmem.c b/arch/um/kernel/physmem.c
index d60df3626727..a74f17b033c4 100644
--- a/arch/um/kernel/physmem.c
+++ b/arch/um/kernel/physmem.c
@@ -101,7 +101,6 @@ void __init setup_physmem(unsigned long start, unsigned long reserve_end,
 	 */
 	os_seek_file(physmem_fd, __pa(__syscall_stub_start));
 	os_write_file(physmem_fd, __syscall_stub_start, PAGE_SIZE);
-	os_fsync_file(physmem_fd);
 
 	memblock_add(__pa(start), len);
 	memblock_reserve(__pa(start), reserve);
diff --git a/arch/um/os-Linux/file.c b/arch/um/os-Linux/file.c
index f1d03cf3957f..a0d01c68ce3e 100644
--- a/arch/um/os-Linux/file.c
+++ b/arch/um/os-Linux/file.c
@@ -255,12 +255,6 @@ void os_close_file(int fd)
 {
 	close(fd);
 }
-int os_fsync_file(int fd)
-{
-	if (fsync(fd) < 0)
-	    return -errno;
-	return 0;
-}
 
 int os_seek_file(int fd, unsigned long long offset)
 {
-- 
2.47.0