Messages in this thread | | | Date | Wed, 14 Jul 2021 07:28:41 +0200 | From | Christoph Hellwig <> | Subject | Re: [PATCH 1/2] mm: call flush_dcache_page in memcpy_to_page and memzero_page |
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On Tue, Jul 13, 2021 at 06:31:23PM -0700, Andrew Morton wrote: > On Tue, 13 Jul 2021 07:52:30 +0200 Christoph Hellwig <hch@lst.de> wrote: > > > memcpy_to_page and memzero_page can write to arbitrary pages, which could > > be in the page cache or in high memory, so call flush_kernel_dcache_pages > > to flush the dcache. > > I assume this presently is not known to cause any problems, but that > some problems might be discovered in the future? In which case, > should we cc:stable?
This is a problem when using these helpers on dcache challeneged architectures. Right now there are just a few users, chances are no one used the PC floppy drіver, the aha1542 driver for an ISA SCSI HBA, and a few advanced and optional btrfs and ext4 features on those platforms yet since the conversion. So yes, stable would be good.
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