linux-kernel - [RFC PATCH v1 46/50] mm/shuffle.c: use get_random

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Date:   Thu, 3 Oct 2019 05:51:56 -0400
From:   George Spelvin <lkml@....org>
To:     linux-kernel@...r.kernel.org, lkml@....org
Cc:     Dan Williams <dan.j.williams@...el.com>, Qian Cai <cai@....pw>,
        Kees Cook <keescook@...omium.org>,
        Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org
Subject: [RFC PATCH v1 46/50] mm/shuffle.c: use get_random_max()

Now that we have it, this is an example of where it helps.

Signed-off-by: George Spelvin <lkml@....org>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Qian Cai <cai@....pw>
Cc: Kees Cook <keescook@...omium.org>
Cc: Michal Hocko <mhocko@...e.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org
---
 mm/shuffle.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/shuffle.c b/mm/shuffle.c
index b3fe97fd66541..e0ed247f8d907 100644
--- a/mm/shuffle.c
+++ b/mm/shuffle.c
@@ -135,7 +135,7 @@ void __meminit __shuffle_zone(struct zone *z)
 			 * in the zone.
 			 */
 			j = z->zone_start_pfn +
-				ALIGN_DOWN(get_random_long() % z->spanned_pages,
+				ALIGN_DOWN(get_random_max(z->spanned_pages),
 						order_pages);
 			page_j = shuffle_valid_page(j, order);
 			if (page_j && page_j != page_i)
-- 
2.26.0