[parisc-linux] Re: Problems with kernel mmap (failing tst-mmap-eofsync in glibc on parisc)

[David S. Miller]

On Fri, 22 Aug 2003 19:34:41 +0100 (BST)
Hugh Dickins <hugh@veritas.com> wrote:

> And to me.  If VM_SHARED is set, then __vma_link_file puts the vma on
> on i_mmap_shared.  If VM_SHARED is not set, it puts the vma on i_mmap.
> flush_dcache_page treats i_mmap_shared and i_mmap lists equally.

But file system page cache writes only call flush_dache_page()
if the page has a non-empty i_mmap_shared list.

> Might the problem be in parisc's __flush_dcache_page,
> which only examines i_mmap_shared?

No, it examines both lists, the problem is not there.

The issue seems to be some confusion about whether the
test program in question is actually mmap()'ing the area
with PROT_WRITE set, and if so why the test case isn't
passing because in such a case the page will have a non-empty
i_mmap_shared list.