From patchwork Mon Dec 13 21:54:28 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: 12674695 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 C068BC433EF for ; Mon, 13 Dec 2021 22:10:06 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 3BD6F6B00A1; Mon, 13 Dec 2021 16:55:16 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 36C976B00A2; Mon, 13 Dec 2021 16:55:16 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 25C976B00A3; Mon, 13 Dec 2021 16:55:16 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0117.hostedemail.com [216.40.44.117]) by kanga.kvack.org (Postfix) with ESMTP id 1A4386B00A1 for ; Mon, 13 Dec 2021 16:55:16 -0500 (EST) Received: from smtpin24.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id DE8E6180CB058 for ; Mon, 13 Dec 2021 21:55:05 +0000 (UTC) X-FDA: 78914126970.24.938AE9B Received: from out0.migadu.com (out0.migadu.com [94.23.1.103]) by imf18.hostedemail.com (Postfix) with ESMTP id 87B471C000A for ; Mon, 13 Dec 2021 21:55:02 +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=1639432504; 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=vluHY+VQM1dpG6ccvF7RpbMooJaXSsDFIpBMIGK6fR8=; b=JnDImSkLaZ6d7uJJAqpBoqYBBE7J0wOFYTvyehFxEy4bRBF1E6C15fV9dW58vlWcg0OVqc kh1HsWxG4piAmnn1hi6+5dpNyhk8/q769Q+GniE5V6LHtL+PYs3URK4pXqeABGEwpPt8av RLMbS14ILb02u/kXoRiu8Q15pzow6KU= From: andrey.konovalov@linux.dev To: Marco Elver , Alexander Potapenko , Andrew Morton Cc: Andrey Konovalov , 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 v3 32/38] kasan: mark kasan_arg_stacktrace as __initdata Date: Mon, 13 Dec 2021 22:54:28 +0100 Message-Id: <7825a5fecec3626441ed3fe734090e9e3ab9a0f9.1639432170.git.andreyknvl@google.com> In-Reply-To: References: MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT X-Migadu-Auth-User: andrey.konovalov@linux.dev X-Stat-Signature: ec4mspzhu7cfymm4o36dw5ycnjisis4j Authentication-Results: imf18.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=JnDImSkL; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf18.hostedemail.com: domain of andrey.konovalov@linux.dev designates 94.23.1.103 as permitted sender) smtp.mailfrom=andrey.konovalov@linux.dev X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 87B471C000A X-HE-Tag: 1639432502-312190 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 bbcf6f914490..fb08fe1a3cf7 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) { /*