1 files changed, 8 insertions, 0 deletions

diff --git a/arch/um/kernel/physmem.c b/arch/um/kernel/physmem.c
index 420e6d51fa0f..a24e3b7f4bf0 100644
--- a/arch/um/kernel/physmem.c
+++ b/arch/um/kernel/physmem.c
@@ -353,6 +353,8 @@ void map_memory(unsigned long virt, unsigned long phys, unsigned long len,
 
 #define PFN_UP(x) (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
 
+extern int __syscall_stub_start, __binary_start;
+
 void setup_physmem(unsigned long start, unsigned long reserve_end,
                    unsigned long len, unsigned long highmem)
 {
@@ -371,6 +373,12 @@ void setup_physmem(unsigned long start, unsigned long reserve_end,
                 exit(1);
         }
 
+        /* Special kludge - This page will be mapped in to userspace processes
+         * from physmem_fd, so it needs to be written out there.
+         */
+        os_seek_file(physmem_fd, __pa(&__syscall_stub_start));
+        os_write_file(physmem_fd, &__syscall_stub_start, PAGE_SIZE);
+
         bootmap_size = init_bootmem(pfn, pfn + delta);
         free_bootmem(__pa(reserve_end) + bootmap_size,
                      len - bootmap_size - reserve);