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[kvm-unit-tests,v2,10/11] lib/alloc_page: Wire up FLAG_DONTZERO

Message ID 20210115123730.381612-11-imbrenda@linux.ibm.com (mailing list archive)
State New, archived
Headers show
Series Fix and improve the page allocator | expand

Commit Message

Claudio Imbrenda Jan. 15, 2021, 12:37 p.m. UTC 
Memory allocated without FLAG_DONTZERO will now be zeroed before being
returned to the caller.

This means that by default all allocated memory is now zeroed, restoring the
default behaviour that had been accidentally removed by a previous commit.

Fixes: 8131e91a4b61 ("lib/alloc_page: complete rewrite of the page allocator")
Reported-by: Nadav Amit <nadav.amit@gmail.com>

Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
---
 lib/alloc_page.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/lib/alloc_page.c b/lib/alloc_page.c
index 47e2981..95d957b 100644
--- a/lib/alloc_page.c
+++ b/lib/alloc_page.c
@@ -372,6 +372,8 @@  static void *page_memalign_order_flags(u8 al, u8 ord, u32 flags)
 		if (area & BIT(i))
 			res = page_memalign_order(areas + i, al, ord);
 	spin_unlock(&lock);
+	if (res && !(flags & FLAG_DONTZERO))
+		memset(res, 0, BIT(ord) * PAGE_SIZE);
 	return res;
 }