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| author | Chris Metcalf <cmetcalf@tilera.com> | 2012-03-29 15:36:53 -0400 |
|---|---|---|
| committer | Chris Metcalf <cmetcalf@tilera.com> | 2012-04-02 12:13:05 -0400 |
| commit | 12400f1f22ad7651efa1d3d06dd8b6b178d19ea3 (patch) | |
| tree | 7654198e93cc3adda551c31dd19630c01e94e8b5 /arch/tile/mm | |
| parent | 48292738d06d7b46d861652ef59bd03be931c2c9 (diff) | |
| download | linux-12400f1f22ad7651efa1d3d06dd8b6b178d19ea3.tar.bz2 | |
arch/tile: don't set the homecache of a PTE unless appropriate
We make sure not to try to set the home for an MMIO PTE (on tilegx)
or a PTE that isn't referencing memory managed by Linux.
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Diffstat (limited to 'arch/tile/mm')
| -rw-r--r-- | arch/tile/mm/pgtable.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/arch/tile/mm/pgtable.c b/arch/tile/mm/pgtable.c index 87303693a072..6b9a109c3e31 100644 --- a/arch/tile/mm/pgtable.c +++ b/arch/tile/mm/pgtable.c @@ -469,10 +469,18 @@ void __set_pte(pte_t *ptep, pte_t pte) void set_pte(pte_t *ptep, pte_t pte) { - struct page *page = pfn_to_page(pte_pfn(pte)); - - /* Update the home of a PTE if necessary */ - pte = pte_set_home(pte, page_home(page)); + if (pte_present(pte) && + (!CHIP_HAS_MMIO() || hv_pte_get_mode(pte) != HV_PTE_MODE_MMIO)) { + /* The PTE actually references physical memory. */ + unsigned long pfn = pte_pfn(pte); + if (pfn_valid(pfn)) { + /* Update the home of the PTE from the struct page. */ + pte = pte_set_home(pte, page_home(pfn_to_page(pfn))); + } else if (hv_pte_get_mode(pte) == 0) { + /* remap_pfn_range(), etc, must supply PTE mode. */ + panic("set_pte(): out-of-range PFN and mode 0\n"); + } + } __set_pte(ptep, pte); } |