On Tuesday, 2 March 2021 10:14:56 AM AEDT Ralph Campbell wrote:
> > From: Alistair Popple <apopple@xxxxxxxxxx>
> > Sent: Thursday, February 25, 2021 11:19 PM
> > To: linux-mm@xxxxxxxxx; nouveau@xxxxxxxxxxxxxxxxxxxxx;
> > bskeggs@xxxxxxxxxx; akpm@xxxxxxxxxxxxxxxxxxxx
> > Cc: linux-doc@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; dri-
> > devel@xxxxxxxxxxxxxxxxxxxxx; John Hubbard <jhubbard@xxxxxxxxxx>; Ralph
> > Campbell <rcampbell@xxxxxxxxxx>; jglisse@xxxxxxxxxx; Jason Gunthorpe
> > <jgg@xxxxxxxxxx>; hch@xxxxxxxxxxxxx; daniel@xxxxxxxx; Alistair Popple
> > <apopple@xxxxxxxxxx>
> > Subject: [PATCH v3 6/8] mm: Selftests for exclusive device memory
> >
> > Adds some selftests for exclusive device memory.
> >
> > Signed-off-by: Alistair Popple <apopple@xxxxxxxxxx>
>
> One minor nit below, but you can add
Thanks Ralph. Will fix that.
> Tested-by: Ralph Campbell <rcampbell@xxxxxxxxxx>
> Reviewed-by: Ralph Campbell <rcampbell@xxxxxxxxxx>
>
> > +static int dmirror_exclusive(struct dmirror *dmirror,
> > + struct hmm_dmirror_cmd *cmd)
> > +{
> > + unsigned long start, end, addr;
> > + unsigned long size = cmd->npages << PAGE_SHIFT;
> > + struct mm_struct *mm = dmirror->notifier.mm;
> > + struct page *pages[64];
> > + struct dmirror_bounce bounce;
> > + unsigned long next;
> > + int ret;
> > +
> > + start = cmd->addr;
> > + end = start + size;
> > + if (end < start)
> > + return -EINVAL;
> > +
> > + /* Since the mm is for the mirrored process, get a reference first. */
> > + if (!mmget_not_zero(mm))
> > + return -EINVAL;
> > +
> > + mmap_read_lock(mm);
> > + for (addr = start; addr < end; addr = next) {
> > + int i, mapped;
> > +
> > + if (end < addr + (64 << PAGE_SHIFT))
> > + next = end;
> > + else
> > + next = addr + (64 << PAGE_SHIFT);
>
> I suggest using ARRAY_SIZE(pages) instead of '64' to make the meaning clear.
>
>
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