Re: [PATCH 1/3] csky: Fixup arch_get_unmapped_area() implementation
From: Guo Ren
Date: Tue Aug 20 2019 - 23:44:53 EST
On Wed, Aug 21, 2019 at 10:16 AM Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote:
> > +/*
> > + * We need to ensure that shared mappings are correctly aligned to
> > + * avoid aliasing issues with VIPT caches. We need to ensure that
> > + * a specific page of an object is always mapped at a multiple of
> > + * SHMLBA bytes.
> > + *
> > + * We unconditionally provide this function for all cases.
> > + */
> On something unrelated: If csky has virtually indexed caches you also
> need to implement the flush_kernel_vmap_range and
> invalidate_kernel_vmap_range functions to avoid data corruption when
> doing I/O on vmalloc/vmap ranges.
I'll give another patch for this issue