linux-kernel - [PATCH 3/4] mm/damon/vaddr: Hide kernel pointer from damon_va_three

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Date:   Wed, 29 Dec 2021 13:10:15 +0000
From:   SeongJae Park <sj@...nel.org>
To:     akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        SeongJae Park <sj@...nel.org>
Subject: [PATCH 3/4] mm/damon/vaddr: Hide kernel pointer from damon_va_three_regions() failure log

The failure log message for 'damon_va_three_regions()' prints the target
id, which is a 'struct pid' pointer in the case.  To avoid exposing the
kernel pointer via the log, this commit makes the log to use the index
of the target in the context's targets list instead.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/damon/vaddr.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/mm/damon/vaddr.c b/mm/damon/vaddr.c
index 7997e1c000ed..73ee9719f8ba 100644
--- a/mm/damon/vaddr.c
+++ b/mm/damon/vaddr.c
@@ -232,13 +232,19 @@ static int damon_va_three_regions(struct damon_target *t,
 static void __damon_va_init_regions(struct damon_ctx *ctx,
 				     struct damon_target *t)
 {
+	struct damon_target *ti;
 	struct damon_region *r;
 	struct damon_addr_range regions[3];
 	unsigned long sz = 0, nr_pieces;
-	int i;
+	int i, tidx = 0;
 
 	if (damon_va_three_regions(t, regions)) {
-		pr_debug("Failed to get three regions of target %lu\n", t->id);
+		damon_for_each_target(ti, ctx) {
+			if (ti == t)
+				break;
+			tidx++;
+		}
+		pr_debug("Failed to get three regions of %dth target\n", tidx);
 		return;
 	}
 
-- 
2.17.1