um: remove file sync for stub data

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.

Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Link: https://patch.msgid.link/20241103150506.1367695-3-benjamin@sipsolutions.net
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/arch/um/include/shared/os.h b/arch/um/include/shared/os.h
index d709a24dc6fc83ed4ebce2f8ce60c89c8d1261d3..6c656ef096c99e07e817412f835425d9db54af99 100644 (file)
--- 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 d60df3626727983797e5e4c5ccd654b58c860037..a74f17b033c4175c4c68081ad0dbcd8fe493d609 100644 (file)
--- 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 f1d03cf3957fe820961f2e5b75130c1af2595fdc..a0d01c68ce3ee82d045756bca6dc1e4fe46a7a75 100644 (file)
--- 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)
 {