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thp: add HPAGE_PMD_* definitions for !CONFIG_TRANSPARENT_HUGEPAGE

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These macros will be used in a later patch, where all usages are expected
to be optimized away without #ifdef CONFIG_TRANSPARENT_HUGEPAGE.  But to
detect unexpected usages, we convert the existing BUG() to BUILD_BUG().

[[email protected]: fix build in mm/pgtable-generic.c]
Signed-off-by: Naoya Horiguchi <[email protected]>
Acked-by: Hillf Danton <[email protected]>
Reviewed-by: Andrea Arcangeli <[email protected]>
Reviewed-by: KAMEZAWA Hiroyuki <[email protected]>
Acked-by: David Rientjes <[email protected]>
Cc: Daisuke Nishimura <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Naoya Horiguchi 2012-03-21 16:34:27 -07:00 • committed by Linus Torvalds
commit d8c37c4806
2 changed files with 9 additions and 7 deletions
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5
mm/pgtable-generic.c
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@ -70,10 +70,11 @@ int pmdp_clear_flush_young(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp)
{
int young;
#ifndef CONFIG_TRANSPARENT_HUGEPAGE
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
VM_BUG_ON(address & ~HPAGE_PMD_MASK);
#else
BUG();
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
VM_BUG_ON(address & ~HPAGE_PMD_MASK);
young = pmdp_test_and_clear_young(vma, address, pmdp);
if (young)
flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);