From patchwork Fri Jul 19 10:22:12 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: xueqin Luo X-Patchwork-Id: 813512 Received: from mail-pl1-f194.google.com (mail-pl1-f194.google.com [209.85.214.194]) (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 02B2982D69; Fri, 19 Jul 2024 10:23:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.194 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721384591; cv=none; b=hoKQV7EmdfS6pFnNZQfrIGEC/nF9rNItiyjc5nRbOBfn2hthXThIssu/FPEmJdp4FNOc6lz1Cc1MNtNlJr+OeP8L0k9OG+TXp5f8IjoYDlhW5kJ8eOKHBbD3tFqulh8J2GKEyR1oYH3+tlGGUR3ZaUMpPbgv3sNBHqK6Oobr0GQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721384591; c=relaxed/simple; bh=odHth/5yAnmmeRVLLttZI54SxLBD/q7eKts+Y63UlPA=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=cu1XocIvrWuAdK3nnZmfRzSimKwsb4QeGCelBc2L0Dtmv96mSZWZSsI9UCCkupsrEBb0uk6zu7DIfkIN99u+TiR6fpPr3pB4b2U9khanccFEg0hBaB04ixb5BW6+TBEISpDS3j07YMYNEibojeqCML3+mo+R3P7IVBDwp6Dkqmo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn; spf=pass smtp.mailfrom=gmail.com; arc=none smtp.client-ip=209.85.214.194 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Received: by mail-pl1-f194.google.com with SMTP id d9443c01a7336-1fd69e44596so2008755ad.1; Fri, 19 Jul 2024 03:23:08 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1721384588; x=1721989388; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=PzIznD4An+j8MgLPrLcoQQ2kcUvCuZm2sbz2UvLTaEg=; b=n+2I09M8rJdt41yHxamDcbTPQws7ka6FUilJG2YOkPry3n+SxnHkJ56F19H44JG+K3 VnUc9DwwlYJrHTg7pXKMqx/P2gzyBrE3G2+zH/Yt8dCBwOfig1nlpukH77akIXrJfe6i swumUnIhz+LQvLoB6+7TRpc02zRKM1aqkHst9v1dHlq7lD43t7rivF60UggUilCLQwWM Ocwi3iRvB3Uu0iqhPn0AzFwRb1QIu8jtFVwvctQi292fWRAL7jpe6Jie3v0taHnIhyyR 2ZeFRJN5+AcNKdWODAIkTq1sASL5ifB+fdKTniEuZlr3S9H7VRrAbW3DXzHMGXCYmCoT ASrA== X-Forwarded-Encrypted: i=1; AJvYcCUYtIZusgMHQML94s+LDqlOC/Gfi8610O6koMxE4DxG8Jqyg7gI1V5lwHXseudakYwikXJPehpN7Z3GrVkE4MF+bbUJPgI14XjZIw7k X-Gm-Message-State: AOJu0Yzj0yUVQg7sppnsUbvjvjAB/61xCUx9OIGKwqsOk8CoHQfP5NMq NjOPJNus2DeLsSGg3zLVzgISeDqPcnb0ticm5+YtqwFSB9bod6FA X-Google-Smtp-Source: AGHT+IGQdZ21/i2k31nXeNT/Pfe+gBAQu5RhIGS2Ny1Ytvm0dUuQ4Ab4LsjJ+5rrq93gVqf00Rl6SQ== X-Received: by 2002:a17:902:da91:b0:1fb:d07c:64cd with SMTP id d9443c01a7336-1fc5b60a90cmr84055805ad.21.1721384588189; Fri, 19 Jul 2024 03:23:08 -0700 (PDT) Received: from localhost.localdomain ([111.48.58.10]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1fd6f49a218sm1283535ad.298.2024.07.19.03.23.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 19 Jul 2024 03:23:07 -0700 (PDT) From: Xueqin Luo To: rafael@kernel.org, pavel@ucw.cz, len.brown@intel.com Cc: linux-pm@vger.kernel.org, xiongxin@kylinos.cn, linux-kernel@vger.kernel.org, Xueqin Luo Subject: [PATCH] PM: hibernate: Use sysfs_emit() and sysfs_emit_at() in "show" functions Date: Fri, 19 Jul 2024 18:22:12 +0800 Message-Id: <20240719102212.974245-1-luoxueqin@kylinos.cn> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 As Documentation/filesystems/sysfs.rst suggested, show() should only use sysfs_emit() or sysfs_emit_at() when formatting the value to be returned to user space. No functional change intended. Signed-off-by: Xueqin Luo --- kernel/power/hibernate.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-) diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c index 0a213f69a9e4..f55648df9b81 100644 --- a/kernel/power/hibernate.c +++ b/kernel/power/hibernate.c @@ -1123,11 +1123,11 @@ static const char * const hibernation_modes[] = { static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { - int i; - char *start = buf; + int i, pos = 0; + ssize_t sz = 0; if (!hibernation_available()) - return sprintf(buf, "[disabled]\n"); + return sysfs_emit(buf, "[disabled]\n"); for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) { if (!hibernation_modes[i]) @@ -1147,12 +1147,13 @@ static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr, continue; } if (i == hibernation_mode) - buf += sprintf(buf, "[%s] ", hibernation_modes[i]); + pos += sysfs_emit_at(buf, sz, "[%s] ", hibernation_modes[i]); else - buf += sprintf(buf, "%s ", hibernation_modes[i]); + pos += sysfs_emit_at(buf, sz, "%s ", hibernation_modes[i]); + sz += pos; } - buf += sprintf(buf, "\n"); - return buf-start; + sz += sysfs_emit_at(buf, sz, "\n"); + return sz; } static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr, @@ -1210,7 +1211,7 @@ power_attr(disk); static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { - return sprintf(buf, "%d:%d\n", MAJOR(swsusp_resume_device), + return sysfs_emit(buf, "%d:%d\n", MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device)); } @@ -1270,7 +1271,7 @@ power_attr(resume); static ssize_t resume_offset_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { - return sprintf(buf, "%llu\n", (unsigned long long)swsusp_resume_block); + return sysfs_emit(buf, "%llu\n", (unsigned long long)swsusp_resume_block); } static ssize_t resume_offset_store(struct kobject *kobj, @@ -1293,7 +1294,7 @@ power_attr(resume_offset); static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { - return sprintf(buf, "%lu\n", image_size); + return sysfs_emit(buf, "%lu\n", image_size); } static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr, @@ -1314,7 +1315,7 @@ power_attr(image_size); static ssize_t reserved_size_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { - return sprintf(buf, "%lu\n", reserved_size); + return sysfs_emit(buf, "%lu\n", reserved_size); } static ssize_t reserved_size_store(struct kobject *kobj,