From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mta0.migadu.com (out-163.mta0.migadu.com [91.218.175.163]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 061D840F743 for ; Wed, 16 Sep 2026 08:25:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.163 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789547163; cv=none; b=If633Rc/yYJsqVn572qGjSV2ha7n2k8cC2h7YMUMPEjEX9GUaSAv2aQ8NLWx0Eg9pgNIlFPQUEIL8sioQiuo3nN5Zs6vjH2L3fWnfag5liLuXY/ObdUOG/xwiVY1xSMcEM1iHuQeN47ndXcHZT+Az1tCbnTqnerLzMoytbr7sso= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789547163; c=relaxed/simple; bh=jFgYLuMhSLSQE34QZ7YWi1qBRpOmgxt6A18X041cY7s=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=kEc+y5nq+mr/MHg1jn3OAcV1zVUyoMF8rip84BMDnWFvGFil0iAs85RWH2ZLgRvwMKv9QQn6LIqE4t8U9pXhFWOjBfhACDUiERoTyqgKs4Qm3cHH1iM9Zvx270xSAyfRWWiKbokt5SiNfl12+cOovBjRd+PITEl8v2+L9LW2pfo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=ACNpOlIz; arc=none smtp.client-ip=91.218.175.163 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="ACNpOlIz" X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=jFgYLuMhSLSQE34QZ7YWi1qBRpOmgxt6A18X041cY7s=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1789547152; v=1; x=1790151952; b=ACNpOlIziJcMJjVV9bgvUAjoiPUr5hhT/e+mnH4Aj2rGohMGrWaSh8nOrIxFAcU+1lmoZxEW 9pAvzI4Nhu+KbjVCzY/TBzU3wLJnNl79CeHuw3/is7OSmOWtMX4F9tN5pkHmNUAhUUVguVXyo28 p7ytLlGQmIOTrc6bx8DyL888= X-Envelope-To: linux-kernel@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id ee530d7fdc31aba6; Wed, 16 Sep 2026 08:25:52 +0000 X-Mizu-Trace-ID: ee530d7fdc31aba6 X-Migadu-Flow: FLOW_OUT From: Ye Liu Date: Wed, 16 Sep 2026 16:25:30 +0800 Subject: [PATCH 3/3] mm/vmalloc: skip vmalloc_dump_obj for non-vmalloc addresses Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260916-vmalloc_dump_obj-v1-3-7aa402d224df@linux.dev> References: <20260916-vmalloc_dump_obj-v1-0-7aa402d224df@linux.dev> In-Reply-To: <20260916-vmalloc_dump_obj-v1-0-7aa402d224df@linux.dev> To: Andrew Morton , Uladzislau Rezki Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Ye Liu X-Mailer: b4 0.14.3 From: Ye Liu vmalloc_dump_obj() unconditionally searches all vmap nodes even when called with a non-vmalloc address (e.g. a slab or stack pointer from mem_dump_obj()). Add an is_vmalloc_addr() check at the entry to avoid the unnecessary per-node trylock and rb-tree traversal. The KASAN caller already gates on is_vmalloc_addr(), but mem_dump_obj() calls vmalloc_dump_obj() before the fallback type check, so the guard in the callee covers both paths without requiring caller changes. Signed-off-by: Ye Liu --- mm/vmalloc.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 30c610f678dc..b3e706fde202 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -5277,6 +5277,9 @@ bool vmalloc_dump_obj(void *object) unsigned long addr; unsigned long nr_pages; + if (!is_vmalloc_addr(object)) + return false; + addr = PAGE_ALIGN_DOWN((unsigned long) object); /* -- 2.25.1