kunmap_atomic(kaddr);
}
+/*
+ * If we pass in a base or tail page, we can zero up to PAGE_SIZE.
+ * If we pass in a head page, we can zero up to the size of the compound page.
+ */
+#if defined(CONFIG_HIGHMEM) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
+void zero_user_segments(struct page *page, unsigned start1, unsigned end1,
+ unsigned start2, unsigned end2);
+#else /* !HIGHMEM || !TRANSPARENT_HUGEPAGE */
static inline void zero_user_segments(struct page *page,
- unsigned start1, unsigned end1,
- unsigned start2, unsigned end2)
+ unsigned start1, unsigned end1,
+ unsigned start2, unsigned end2)
{
void *kaddr = kmap_atomic(page);
+ unsigned int i;
- BUG_ON(end1 > PAGE_SIZE || end2 > PAGE_SIZE);
+ BUG_ON(end1 > page_size(page) || end2 > page_size(page));
if (end1 > start1)
memset(kaddr + start1, 0, end1 - start1);
memset(kaddr + start2, 0, end2 - start2);
kunmap_atomic(kaddr);
- flush_dcache_page(page);
+ for (i = 0; i < compound_nr(page); i++)
+ flush_dcache_page(page + i);
}
+#endif /* !HIGHMEM || !TRANSPARENT_HUGEPAGE */
static inline void zero_user_segment(struct page *page,
unsigned start, unsigned end)