linux-kernel - [PATCH mm,percpu_ref,rcu 4/6] mm: Make mem_obj_dump() vmalloc() dumps include start and length

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Date:   Tue,  5 Jan 2021 17:17:48 -0800
From:   paulmck@...nel.org
To:     linux-kernel@...r.kernel.org, rcu@...r.kernel.org,
        linux-mm@...ck.org
Cc:     cl@...ux.com, penberg@...nel.org, rientjes@...gle.com,
        iamjoonsoo.kim@....com, akpm@...ux-foundation.org,
        ming.lei@...hat.com, axboe@...nel.dk, kernel-team@...com,
        "Paul E. McKenney" <paulmck@...nel.org>
Subject: [PATCH mm,percpu_ref,rcu 4/6] mm: Make mem_obj_dump() vmalloc() dumps include start and length

From: "Paul E. McKenney" <paulmck@...nel.org>

This commit adds the starting address and number of pages to the vmalloc()
information dumped by way of vmalloc_dump_obj().

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
Cc: <linux-mm@...ck.org>
Reported-by: Andrii Nakryiko <andrii@...nel.org>
Suggested-by: Vlastimil Babka <vbabka@...e.cz>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 mm/vmalloc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index c274ea4..e3229ff 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -3456,7 +3456,8 @@ bool vmalloc_dump_obj(void *object)
 	vm = find_vm_area(objp);
 	if (!vm)
 		return false;
-	pr_cont(" vmalloc allocated at %pS\n", vm->caller);
+	pr_cont(" %u-page vmalloc region starting at %#lx allocated at %pS\n",
+		vm->nr_pages, (unsigned long)vm->addr, vm->caller);
 	return true;
 }
 
-- 
2.9.5