linux-kernel - Question about do

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Date:	Mon, 04 Jun 2012 00:29:45 -0500
From:	Larry Finger <Larry.Finger@...inger.net>
To:	Al Viro <viro@...iv.linux.org.uk>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: Question about do_mmap changes

Al,

In commit e3fc629d7bb70848fbf479688a66d4e76dff46ac in 3.5-rc1, you change 
do_mmap() to static, and use do_mmap_pgoff() instaed. The VirtualBox kernel 
module calls do_mmap(), and no longer compiles. I fixed the compile problem with 
the patch

Index: vboxhost/vboxdrv/r0drv/linux/memobj-r0drv-linux.c
===================================================================
--- vboxhost.orig/vboxdrv/r0drv/linux/memobj-r0drv-linux.c
+++ vboxhost/vboxdrv/r0drv/linux/memobj-r0drv-linux.c
@@ -65,6 +65,13 @@
  # define VBOX_USE_PAE_HACK
  #endif

+/*
+ * 3.5+ kernels no longer have do_mmap(). They need to call
+ * do_mmap_pgoff() instead.
+ */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0)
+#define do_mmap do_mmap_pgoff
+#endif

  /*******************************************************************************
  *   Structures and Typedefs

================================

Although the code now compiles OK, the link step results in

WARNING: "do_mmap_pgoff" [/usr/share/virtualbox/src/vboxhost/vboxdrv/vboxdrv.ko] 
undefined!
WARNING: "do_munmap" [/usr/share/virtualbox/src/vboxhost/vboxdrv/vboxdrv.ko] 
undefined!

================================

I am not quite sure why do_munmap() is undefined as the symbol is exported; 
however, should do_mmap_pgoff() be exported?

Thanks,

Larry
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