Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Sender: faiyazm=codeaurora.org@mg.codeaurora.org
DMARC-Filter: OpenDMARC Filter v1.4.1 smtp.codeaurora.org CF244C4360D
From:   Faiyaz Mohammed <faiyazm@codeaurora.org>
To:     akpm@linux-foundation.org, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
Cc:     guptap@codeaurora.org, Faiyaz Mohammed <faiyazm@codeaurora.org>
Subject: [PATCH v1] mm: page_alloc: Add debug log in free_reserved_area for static memory
Date:   Tue, 28 Sep 2021 14:34:09 +0530
Message-Id: <1632819849-511-1-git-send-email-faiyazm@codeaurora.org>
Precedence: bulk

For INITRD and initmem memory is reserved through "memblock_reserve"
during boot up but it is free via "free_reserved_area" instead
of "memblock_free".
For example:
[    0.294848] Freeing initrd memory: 12K.
[    0.696688] Freeing unused kernel memory: 4096K.

To get the start and end address of the above freed memory and to account
proper memblock added memblock_dbg log in "free_reserved_area".
After adding log:
[    0.294837] memblock_free: [0x00000083600000-0x00000083603000] free_initrd_mem+0x20/0x28
[    0.294848] Freeing initrd memory: 12K.
[    0.695246] memblock_free: [0x00000081600000-0x00000081a00000] free_initmem+0x70/0xc8
[    0.696688] Freeing unused kernel memory: 4096K.

Signed-off-by: Faiyaz Mohammed <faiyazm@codeaurora.org>
---
 mm/page_alloc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index b37435c..f85c3b2 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -8129,6 +8129,11 @@ unsigned long free_reserved_area(void *start, void *end, int poison, const char
 		pr_info("Freeing %s memory: %ldK\n",
 			s, pages << (PAGE_SHIFT - 10));
 
+#ifdef CONFIG_HAVE_MEMBLOCK
+		memblock_dbg("memblock_free: [%#016llx-%#016llx] %pS\n",
+			__pa(start), __pa(end), (void *)_RET_IP_);
+#endif
+
 	return pages;
 }
 
-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a
member of the Code Aurora Forum, hosted by The Linux Foundation