From: NIIBE Yutaka <[EMAIL PROTECTED]>
Date: Mon, 11 Sep 2000 11:10:13 +0900
Then, there is another issue for physically tagged cache system in the
function memory.c:break_cow. It calles flush_cache_page(vma,
address). For physically tagged cache system, we need __physical
address__ here. Currently, the implementation of SH-4 version of
flush_cache_page(vma, address) takes the physicall address from PTE.
However, at this point, PTE is not set for new_page, so, it doesn't
flush the cache for new_page, but the one for old_page.
PTE is not set for new_page at this point, the sequence is:
flush_page_to_ram(new_page);
flush_cache_page(vma, address);
establish_pte(vma, address, page_table,
pte_mkwrite(pte_mkdirty(mk_pte(new_page, vma->vm_page_prot))));
establish_pte happens after flush_cache_page, establish_pte
is what change the PTE over to new_page.
Maybe you are looking at some very old 2.3.x kernel version
which had the order changed?
Later,
David S. Miller
[EMAIL PROTECTED]
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