Re: why VM_SHM has been removed from mm.h?

From: Hugh Dickins
Date: Wed Mar 01 2006 - 12:47:54 EST

On Wed, 1 Mar 2006, Kamran Karimi wrote:
> > Since you're already patching base kernel source (you mention
> > arch/xyz/mm/fault.c), why don't you just patch your own VM_SYSVSHM
> > into include/linux/mm.h, and set it on the vma in ipc/shm.c?
> Yes this looks like a good solution. I have changed VM_SHM in mm.h to be
> 0x0800000 and am looking for a good place to include it in the vma->vm_flags.

I already pointed out that several drivers are setting VM_SHM; and that
we shall remove it in due course. Your DIPC patch should use its own flag.

> shmat() looks like a good place. How can I find the vma of a SysV shm in that
> routine?

shm_mmap would be the right place: shmat's do_mmap will call it.

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