Messages in this thread | | | Date | Fri, 22 Aug 2003 10:36:34 -0700 | From | "David S. Miller" <> | Subject | Re: [parisc-linux] Re: Problems with kernel mmap (failing tst-mmap-eofsync in glibc on parisc) |
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On Fri, 22 Aug 2003 18:41:03 +0100 Matthew Wilcox <willy@debian.org> wrote:
> Uhm. So what happens when the user has stored into the page and now > the kernel wants to read from it? There's still data in the cache for > the user mapping that's non-coherent with the kernel mapping.
I see. This causes the page cache read flush_dcache_page() call not to trigger.
I was very confused by the fact that this bug was explained by saying that "the shared mmap list that flush_dcache_page() checks".
So the idea is that VM_SHARED should be set based upon whether we mmap() the thing writable _not_ whether the open() was done with write permission enabled.
Yes, I agree with that. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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