From patchwork Thu Dec 30 19:14:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: andrey.konovalov@linux.dev X-Patchwork-Id: 12701629 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id E015CC433FE for ; Thu, 30 Dec 2021 19:16:23 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 014926B00B7; Thu, 30 Dec 2021 14:16:22 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id E187A6B00B9; Thu, 30 Dec 2021 14:16:21 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D07BE6B00BA; Thu, 30 Dec 2021 14:16:21 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0074.hostedemail.com [216.40.44.74]) by kanga.kvack.org (Postfix) with ESMTP id BF6E76B00B7 for ; Thu, 30 Dec 2021 14:16:21 -0500 (EST) Received: from smtpin04.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 85C16869A3 for ; Thu, 30 Dec 2021 19:16:21 +0000 (UTC) X-FDA: 78975416562.04.EECF4B7 Received: from out2.migadu.com (out2.migadu.com [188.165.223.204]) by imf02.hostedemail.com (Postfix) with ESMTP id 82A5280006 for ; Thu, 30 Dec 2021 19:16:15 +0000 (UTC) X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1640891780; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=woHyASpRd1dsSk1k8aXjCDxvW5sGTzgveGosFVStA8I=; b=HQhqX9Oud/jvsmb43MVN2YW7rCLd1QpP6q2PAW6Wqd+vSm5iI37er7Q2R6+JPN9o2plHUB YxJ7b3hFAFyTTzHCalLMBoYz/4CVMT+Ex++BMAJxDakHXnU0pAss2JJFLYTofTWhB/qxnD gNArO6Wr/9Rw2WMNAkoXG3S5OYyD7bw= From: andrey.konovalov@linux.dev To: Andrew Morton Cc: Andrey Konovalov , Marco Elver , Alexander Potapenko , Dmitry Vyukov , Andrey Ryabinin , kasan-dev@googlegroups.com, linux-mm@kvack.org, Vincenzo Frascino , Catalin Marinas , Will Deacon , Mark Rutland , linux-arm-kernel@lists.infradead.org, Peter Collingbourne , Evgenii Stepanov , linux-kernel@vger.kernel.org, Andrey Konovalov Subject: [PATCH mm v5 33/39] kasan: mark kasan_arg_stacktrace as __initdata Date: Thu, 30 Dec 2021 20:14:58 +0100 Message-Id: <4ee96e054d59a2c65dace818cfa2c2e2bd1cb2ee.1640891329.git.andreyknvl@google.com> In-Reply-To: References: MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT X-Migadu-Auth-User: linux.dev X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 82A5280006 X-Stat-Signature: 1fyzbufmxhgsehjwtd1e1akr1gm5kjw6 Authentication-Results: imf02.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=HQhqX9Ou; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf02.hostedemail.com: domain of andrey.konovalov@linux.dev designates 188.165.223.204 as permitted sender) smtp.mailfrom=andrey.konovalov@linux.dev X-HE-Tag: 1640891775-234380 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Andrey Konovalov As kasan_arg_stacktrace is only used in __init functions, mark it as __initdata instead of __ro_after_init to allow it be freed after boot. The other enums for KASAN args are used in kasan_init_hw_tags_cpu(), which is not marked as __init as a CPU can be hot-plugged after boot. Clarify this in a comment. Signed-off-by: Andrey Konovalov Suggested-by: Marco Elver --- Changes v1->v2: - Add this patch. --- mm/kasan/hw_tags.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/mm/kasan/hw_tags.c b/mm/kasan/hw_tags.c index 2e9378a4f07f..6509809dd5d8 100644 --- a/mm/kasan/hw_tags.c +++ b/mm/kasan/hw_tags.c @@ -40,7 +40,7 @@ enum kasan_arg_stacktrace { static enum kasan_arg kasan_arg __ro_after_init; static enum kasan_arg_mode kasan_arg_mode __ro_after_init; -static enum kasan_arg_stacktrace kasan_arg_stacktrace __ro_after_init; +static enum kasan_arg_stacktrace kasan_arg_stacktrace __initdata; /* Whether KASAN is enabled at all. */ DEFINE_STATIC_KEY_FALSE(kasan_flag_enabled); @@ -116,7 +116,10 @@ static inline const char *kasan_mode_info(void) return "sync"; } -/* kasan_init_hw_tags_cpu() is called for each CPU. */ +/* + * kasan_init_hw_tags_cpu() is called for each CPU. + * Not marked as __init as a CPU can be hot-plugged after boot. + */ void kasan_init_hw_tags_cpu(void) { /*