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[2620:137:e000::1:20]) by mx.google.com with ESMTP id s6-20020a17090302c600b0018685c33ec2si1071022plk.7.2022.10.24.16.13.56; Mon, 24 Oct 2022 16:14:09 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20210112 header.b="Z2RX/saD"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231446AbiJXXBe (ORCPT + 99 others); Mon, 24 Oct 2022 19:01:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35354 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230379AbiJXXAg (ORCPT ); Mon, 24 Oct 2022 19:00:36 -0400 Received: from mail-ed1-x54a.google.com (mail-ed1-x54a.google.com [IPv6:2a00:1450:4864:20::54a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3D8D82D7803 for ; Mon, 24 Oct 2022 14:22:54 -0700 (PDT) Received: by mail-ed1-x54a.google.com with SMTP id w17-20020a056402269100b00461e28a75ccso2806637edd.8 for ; Mon, 24 Oct 2022 14:22:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=XYIeNtcSMBuwQ4ZUNtMrq5SFnntAuabRdvmK/d2x8js=; b=Z2RX/saDef7hn683V4j0i5oZ/4CeWuvGJYbdKV5tISFit7ef+6l5PCAipzwyZ7BeiO EPirZ8Rv7RC5dlr2jbxe8J5rDP6eyCRFXSbvCOHFLTgHO38oNZ8NcKEZz7LRJV9whBzw SlOVNCjuhY1/3D3mJnUM8hAamOdsnb/MAYvqsbY87QLHYWOnDOLJk2St3m6OCZXsAM0P wiQfeGmmaTY/zb3roX1oY3y/wFJBytPp5+wk9GOpCrE1kCU6zWIY1Vzoyj/dZdyQokMi KtKVBt799EJxWAxrx6ZXHTTkUeoPkaZT3jX6k+JwokHO7Nf58TS2z0+z03halrOoEixy Q+lA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=XYIeNtcSMBuwQ4ZUNtMrq5SFnntAuabRdvmK/d2x8js=; b=nfnae4oYgfaC2tB92nZ0z1qq3CPjGY4fJdNUhRgPazCVEOACqAjs35lJrKb86VOcwM nlEeLdli0tF70KGP0RoIHzcshrTGcYZ1ku1gUXzaWjzfd02D6+JDYrCGs6S0KNi79k13 OZVkEQKjac8VK9XbgX68fgJUXiUQDr0aeXQ89dW1zOR25cim5yO0sJXwpItmFzokozjp v/+J6x+TFliuveVnpOA2DM3TG8NromDczo/FOy91MoIrN20aWy2yT23pezNl6SUDR1R5 25sAELJcpxXF/oYoANF6Nk/66AvJ/014qf1/obJSdAz9WaKCLW4eXvP6PuTqCO/+cTnf awAg== X-Gm-Message-State: ACrzQf1IMZgiN7VFSobCAUqowKWGGda1wT/qCsG/rV+hAu9InEpR9fnh P/XAgT6xMEmV48tgRldgdimYcSLQWS0= X-Received: from glider.muc.corp.google.com ([2a00:79e0:9c:201:8695:7c88:66ed:f9d1]) (user=glider job=sendgmr) by 2002:a17:906:8451:b0:79d:af69:8a20 with SMTP id e17-20020a170906845100b0079daf698a20mr15002244ejy.406.1666646524113; Mon, 24 Oct 2022 14:22:04 -0700 (PDT) Date: Mon, 24 Oct 2022 23:21:42 +0200 In-Reply-To: <20221024212144.2852069-1-glider@google.com> Mime-Version: 1.0 References: <20221024212144.2852069-1-glider@google.com> X-Mailer: git-send-email 2.38.0.135.g90850a2211-goog Message-ID: <20221024212144.2852069-3-glider@google.com> Subject: [PATCH 3/5] Kconfig.debug: disable CONFIG_FRAME_WARN for KMSAN by default From: Alexander Potapenko To: glider@google.com Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Andrew Morton , Kees Cook , Masahiro Yamada , Nick Desaulniers , linux-kbuild@vger.kernel.org X-Spam-Status: No, score=-9.6 required=5.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1747612597773709442?= X-GMAIL-MSGID: =?utf-8?q?1747612597773709442?= KMSAN adds a lot of instrumentation to the code, which results in increased stack usage (up to 2048 bytes and more in some cases). It's hard to predict how big the stack frames can be, so we disable the warnings for KMSAN instead. Cc: Andrew Morton Cc: Kees Cook Cc: Masahiro Yamada Cc: Nick Desaulniers Cc: linux-kbuild@vger.kernel.org Link: https://github.com/google/kmsan/issues/89 Signed-off-by: Alexander Potapenko --- lib/Kconfig.debug | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 3fc7abffc7aa2..29280072dc0e4 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -400,8 +400,9 @@ config FRAME_WARN default 1536 if (!64BIT && XTENSA) default 1024 if !64BIT default 2048 if 64BIT + default 0 if KMSAN help - Tell gcc to warn at build time for stack frames larger than this. + Tell the compiler to warn at build time for stack frames larger than this. Setting this too low will cause a lot of warnings. Setting it to 0 disables the warning.