On 3/18/2021 4:42 AM, Borislav Petkov wrote:

On Tue, Mar 16, 2021 at 08:10:47AM -0700, Yu-cheng Yu wrote:

quoted

There was no more caller passing vm_flags to do_mmap(), and vm_flags was
removed from the function's input by:

     commit 45e55300f114 ("mm: remove unnecessary wrapper function do_mmap_pgoff()").

There is a new user now.  Shadow stack allocation passes VM_SHSTK to
do_mmap().  Re-introduce vm_flags to do_mmap(), but without the old wrapper
do_mmap_pgoff().

Why does this matter at all?

$ git grep do_mmap_pgoff
$

Right, do_mmap_pgoff() was removed by commit 45e55300f114.  This patch 
does not add back the wrapper.  Instead, add vm_flags to do_mmap(). 
Please advice if I misunderstand the question.

Thanks,
Yu-cheng