linux-kernel - [PATCH] mm/mm_init.c: add debug messsge for dma zone

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Date:   Wed,  7 Jun 2023 09:07:34 +0000
From:   Haifeng Xu <haifeng.xu@...pee.com>
To:     rppt@...nel.org
Cc:     mhocko@...nel.org, akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Haifeng Xu <haifeng.xu@...pee.com>
Subject: [PATCH] mm/mm_init.c: add debug messsge for dma zone

If freesize is less than dma_reserve, print warning message to report
this case.

Signed-off-by: Haifeng Xu <haifeng.xu@...pee.com>
---
 mm/mm_init.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/mm/mm_init.c b/mm/mm_init.c
index 232efac9a929..9a9d6a52471c 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -1561,9 +1561,14 @@ static void __init free_area_init_core(struct pglist_data *pgdat)
 		}
 
 		/* Account for reserved pages */
-		if (j == 0 && freesize > dma_reserve) {
-			freesize -= dma_reserve;
-			pr_debug("  %s zone: %lu pages reserved\n", zone_names[0], dma_reserve);
+		if (j == 0) {
+			if (freesize >= dma_reserve) {
+				freesize -= dma_reserve;
+				pr_debug("  %s zone: %lu pages reserved\n",
+					 zone_names[0], dma_reserve);
+			} else
+				pr_warn("  %s zone: %lu reserved pages exceeds freesize %lu\n",
+					zone_names[0], dma_reserve, freesize);
 		}
 
 		if (!is_highmem_idx(j))
-- 
2.25.1