Kernel: Don't page in entire file immediately on mmap().

If we just don't do anything, the page fault handler will load the file
incrementally as-needed instead. :^)

1 files changed, 1 insertions, 4 deletions

diff --git a/Kernel/FileSystem/FileDescriptor.cpp b/Kernel/FileSystem/FileDescriptor.cpp
index 2e0b64e233..b158fb6eb0 100644
--- a/Kernel/FileSystem/FileDescriptor.cpp
+++ b/Kernel/FileSystem/FileDescriptor.cpp
@@ -338,12 +338,9 @@ KResultOr<Region*> FileDescriptor::mmap(Process& process, LinearAddress laddr, s
     region_name = "Memory-mapped file";
 #endif
     InterruptDisabler disabler;
-    // FIXME: Implement mapping at a client-specified address. Most of the support is already in plcae.
-    ASSERT(laddr.as_ptr() == nullptr);
-    auto* region = process.allocate_file_backed_region(LinearAddress(), size, inode(), move(region_name), prot & PROT_READ, prot & PROT_WRITE);
+    auto* region = process.allocate_file_backed_region(laddr, size, inode(), move(region_name), prot & PROT_READ, prot & PROT_WRITE);
     if (!region)
         return KResult(-ENOMEM);
-    region->page_in();
     return region;
 }