From mboxrd@z Thu Jan 1 00:00:00 1970 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 76E2CC04A68 for ; Thu, 28 Jul 2022 15:49:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231970AbiG1PtB (ORCPT ); Thu, 28 Jul 2022 11:49:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59584 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231530AbiG1Psz (ORCPT ); Thu, 28 Jul 2022 11:48:55 -0400 Received: from mail-ej1-x62f.google.com (mail-ej1-x62f.google.com [IPv6:2a00:1450:4864:20::62f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 91AF26AA34; Thu, 28 Jul 2022 08:48:54 -0700 (PDT) Received: by mail-ej1-x62f.google.com with SMTP id mf4so3874994ejc.3; Thu, 28 Jul 2022 08:48:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=2Wa6yLMGc2WRkmaEKpyRFxQSUgk0ChF0sgc7hNeYrTc=; b=Wi2kogBx1v57y4wibVUnI6G/UgvL1LHvS4d/uPEyg9ZX9fKQ1HixwGecaT2wTR3WV4 Dk4KY/WLb461sl13k+D+nVbhKGeAYYvetQYWCrU0jlW5YL4RcYzYP4U1BLZXEifXoOaQ kxRJS5ngbLWb7qh60YcmDyhJpFMTFBH7tlScHZJemIWQyIGLWw9XBFgsg3YPvmAsYHRE FMUPtHKsn01CUhwf0eWZBqe+tLAxyFw7bOBRB4azCgIdOW6//eiMdB6Q/t9gDeCXEFc7 g3JyLg01hSDloqrmG9HkWhTj7IqgFECvFcDBeE3QSv3tFb+FdJL18Ucy+ZB/aTWA6026 SDKQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=2Wa6yLMGc2WRkmaEKpyRFxQSUgk0ChF0sgc7hNeYrTc=; b=LNAogRaPrEJ5K++CgBrO1qzRgBGH3xJ15HRP15OSpexNoMLnfoXLoXZmj1OkUkwrUv tLEl80GMZ7MtvIeRvDGYxC72F27Yvr6UgMPZj70S9Zjk/kMCVO2XNo6jGtfSKRs6TlPy lce9u20JQNoap3Wim18ncHGuDu3jBgD4hKy8YQ+gSqPjZRSZnoB+nXc5IQ8PkKLXQcij WJpcSWi1LEEiAqq9u8lGuXq+h6ePEH1yh5+bEEknGmBuTTALNeLLeWe0tNQmsjQj19mD d8kk7EqzKS5BdN2VCs6+SzgrRrih3OV3JTp1p/4ZJqauJhENrhJNR45WlP7mMguluxMX DTtQ== X-Gm-Message-State: AJIora/7ApYcsSDc9nefM5AibxBXadK5DeTOuCoc0MZHfju5GHnLUjh/ nHpWNH11PrVO7gIOB1lRdNs= X-Google-Smtp-Source: AGRyM1tD875+kA8zgArLguhNqKdpsnvyBlPd2vCrNHJpX9PLxH1r635BTw2y/NVAwK3twnyTbFh+FQ== X-Received: by 2002:a17:907:6e0f:b0:72e:d066:dfe5 with SMTP id sd15-20020a1709076e0f00b0072ed066dfe5mr21796786ejc.558.1659023333982; Thu, 28 Jul 2022 08:48:53 -0700 (PDT) Received: from localhost.localdomain (host-79-56-6-250.retail.telecomitalia.it. [79.56.6.250]) by smtp.gmail.com with ESMTPSA id f7-20020a056402068700b0043adc6552d6sm902487edy.20.2022.07.28.08.48.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Jul 2022 08:48:52 -0700 (PDT) From: "Fabio M. De Francesco" To: Mike Rapoport , Thomas Gleixner , Ira Weiny , Andrew Morton , Catalin Marinas , "Matthew Wilcox (Oracle)" , Will Deacon , Peter Collingbourne , Vlastimil Babka , Sebastian Andrzej Siewior , Jonathan Corbet , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org Cc: "Fabio M. De Francesco" Subject: [PATCH v2 2/7] highmem: Specify that kmap_local_page() is callable from interrupts Date: Thu, 28 Jul 2022 17:48:39 +0200 Message-Id: <20220728154844.10874-3-fmdefrancesco@gmail.com> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20220728154844.10874-1-fmdefrancesco@gmail.com> References: <20220728154844.10874-1-fmdefrancesco@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In a recent thread about converting kmap() to kmap_local_page(), the safety of calling kmap_local_page() was questioned.[1] "any context" should probably be enough detail for users who want to know whether or not kmap_local_page() can be called from interrupts. However, Linux still has kmap_atomic() which might make users think they must use the latter in interrupts. Add "including interrupts" for better clarity. [1] https://lore.kernel.org/lkml/3187836.aeNJFYEL58@opensuse/ Cc: Andrew Morton Cc: Matthew Wilcox (Oracle) Cc: Mike Rapoport Cc: Sebastian Andrzej Siewior Cc: Thomas Gleixner Suggested-by: Ira Weiny Signed-off-by: Fabio M. De Francesco --- include/linux/highmem.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/highmem.h b/include/linux/highmem.h index accd286a6af5..0ba031ad29c2 100644 --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -64,7 +64,7 @@ static inline void kmap_flush_unused(void); * * Returns: The virtual address of the mapping * - * Can be invoked from any context. + * Can be invoked from any context, including interrupts. * * Requires careful handling when nesting multiple mappings because the map * management is stack based. The unmap has to be in the reverse order of -- 2.37.1