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s390/mm: avoid using pmd_to_page for !USE_SPLIT_PMD_PTLOCKS

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pmd_to_page() is only available if USE_SPLIT_PMD_PTLOCKS is defined.
The use of pmd_to_page in the gmap code can cause compile errors if
NR_CPUS is smaller than SPLIT_PTLOCK_CPUS. Do not use pmd_to_page
outside of USE_SPLIT_PMD_PTLOCKS sections.

Reported-by: Mike Frysinger <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
This commit is contained in:
Martin Schwidefsky committed 2015-01-08 10:02:18 +01:00
1 parent e38f978133
commit fbc89c952f
1 file changed
+3 -2
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arch/s390/mm/pgtable.c
+3 -2
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@@ -322,11 +322,12 @@ static int gmap_alloc_table(struct gmap *gmap, unsigned long *table,
static unsigned long __gmap_segment_gaddr(unsigned long *entry)
{
struct page *page;
unsigned long offset;
unsigned long offset, mask;
offset = (unsigned long) entry / sizeof(unsigned long);
offset = (offset & (PTRS_PER_PMD - 1)) * PMD_SIZE;
page = pmd_to_page((pmd_t *) entry);
mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1);
page = virt_to_page((void *)((unsigned long) entry & mask));
return page->index + offset;
}