From patchwork Tue Jul 30 06:54:54 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: xueqin Luo X-Patchwork-Id: 13746765 Received: from mail-pl1-f193.google.com (mail-pl1-f193.google.com [209.85.214.193]) (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 C751C190679; Tue, 30 Jul 2024 06:55:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.193 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722322520; cv=none; b=tzWOfjTA7qmQPSzpZQ7rnrz8ULvkoaof+D5fTsgqZs2wEwryAg2Gdl7gd8PLNPEd7oX4YqVzDssNDzS4s0nvZ697XjpPvYlAZEHXjUUMlliGfwGivuxXVkiw+qPK72ii7HIIJkUpjuyMDHlK6THKG8VwSIBEJeWHNOhoxm2J7Gs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722322520; c=relaxed/simple; bh=PoHSTTNR1pOiYNNUBE7bjSLO9vqCQ+kY4ubAIS5usC0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=d648aLCqvB5YXGVDLmFV36tYhQ42et10lPqrphbxlImPpJqSZQdonGE5vCTBRg6sJpKQ62tuHga7NHKQLG1c/NlBIA4JSvPCjcyb4SUCdKyWKONuTP7AtacbOgB9K8Jb2+vRx2UKKBhAenX1yEX+A0RwzwxOiMMHDQuFtcs53UU= 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=209.85.214.193 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-f193.google.com with SMTP id d9443c01a7336-1fd9e6189d5so29650125ad.3; Mon, 29 Jul 2024 23:55:18 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1722322518; x=1722927318; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=s5wItCNcIebvedYEvm9R9N3fFYU34EHG9QRxjv4o3IY=; b=NQkgY39wcEwKuoRrZog2y5JuFwqqbnpdU9FOrt/34tzMvD8lBakU9WyC7mudbo7J/Y +sGtKEvzxbByjzEGhsGjxnr45glEVaFbMy1e80lhOSou6VQWzq5cJLREuO2liKYfDa8r OZOlydH/OUYrgXzLet1y6bi2tFyhewbrsp9cUZzF4AXcQvDNKR7gNYdooGEMptEUxxcV C8c6Q2CA+hQEmrOxUrxpcfTcir9jFaZRHUVaVeWQXtoFmf8HC5frOWsDU8HeXHVDENvJ 7uxEjCpCpC1hjaOabrpIi4FasrTIMnIuw2UoH/8b1HduTDUKlrIHGf9+dLm7jYs7eH8i AoBQ== X-Forwarded-Encrypted: i=1; AJvYcCUmw7IBltkB+vmwni0zOreZzdIeKG1h6nfLW/eLzpP0nkpiJfd5E5jdXSdzL1i6Hw7bfxSysbogMJIvXIf0sqoJfhiO/78fD4Oa3WHc X-Gm-Message-State: AOJu0YzauOPgiw9rthfYT+WwFIrjJv2bvUGAj9gR34G7WkeixusgCl3u Kxlo26Wia3D+Luuc71Hnz6kPdSsh3d1K74J1PEWu039j+pLPb/cf X-Google-Smtp-Source: AGHT+IGbpeqVJZThdkiblEwt3ilFhbSlAjidRzQS+YIwiYxJn6p66YtqNHxmXa/ulBa9vv6UOU0nog== X-Received: by 2002:a17:902:d506:b0:1fb:72b4:8775 with SMTP id d9443c01a7336-1ff0489f453mr88974555ad.40.1722322517939; Mon, 29 Jul 2024 23:55:17 -0700 (PDT) Received: from localhost.localdomain ([111.48.58.10]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1fed7f1aa18sm94392875ad.190.2024.07.29.23.55.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 29 Jul 2024 23:55:17 -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: [RESEND PATCH 2/2] PM: Use sysfs_emit() and sysfs_emit_at() in "show" functions Date: Tue, 30 Jul 2024 14:54:54 +0800 Message-Id: <20240730065454.2096296-3-luoxueqin@kylinos.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240730065454.2096296-1-luoxueqin@kylinos.cn> References: <20240730065454.2096296-1-luoxueqin@kylinos.cn> 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/main.c | 70 ++++++++++++++++++++++----------------------- 1 file changed, 35 insertions(+), 35 deletions(-) diff --git a/kernel/power/main.c b/kernel/power/main.c index a9e0693aaf69..4ea4e2fa4da7 100644 --- a/kernel/power/main.c +++ b/kernel/power/main.c @@ -115,7 +115,7 @@ int pm_async_enabled = 1; static ssize_t pm_async_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { - return sprintf(buf, "%d\n", pm_async_enabled); + return sysfs_emit(buf, "%d\n", pm_async_enabled); } static ssize_t pm_async_store(struct kobject *kobj, struct kobj_attribute *attr, @@ -139,8 +139,8 @@ power_attr(pm_async); static ssize_t mem_sleep_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { - char *s = buf; suspend_state_t i; + ssize_t sz = 0; for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++) { if (i >= PM_SUSPEND_MEM && cxl_mem_active()) @@ -149,17 +149,17 @@ static ssize_t mem_sleep_show(struct kobject *kobj, struct kobj_attribute *attr, const char *label = mem_sleep_states[i]; if (mem_sleep_current == i) - s += sprintf(s, "[%s] ", label); + sz += sysfs_emit_at(buf, sz, "[%s] ", label); else - s += sprintf(s, "%s ", label); + sz += sysfs_emit_at(buf, sz, "%s ", label); } } /* Convert the last space to a newline if needed. */ - if (s != buf) - *(s-1) = '\n'; + if (sz) + sz += sysfs_emit_at(buf, sz, "\n"); - return (s - buf); + return sz; } static suspend_state_t decode_suspend_state(const char *buf, size_t n) @@ -220,7 +220,7 @@ bool sync_on_suspend_enabled = !IS_ENABLED(CONFIG_SUSPEND_SKIP_SYNC); static ssize_t sync_on_suspend_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { - return sprintf(buf, "%d\n", sync_on_suspend_enabled); + return sysfs_emit(buf, "%d\n", sync_on_suspend_enabled); } static ssize_t sync_on_suspend_store(struct kobject *kobj, @@ -257,22 +257,22 @@ static const char * const pm_tests[__TEST_AFTER_LAST] = { static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { - char *s = buf; int level; + size_t sz = 0; for (level = TEST_FIRST; level <= TEST_MAX; level++) if (pm_tests[level]) { if (level == pm_test_level) - s += sprintf(s, "[%s] ", pm_tests[level]); + sz += sysfs_emit_at(buf, sz, "[%s] ", pm_tests[level]); else - s += sprintf(s, "%s ", pm_tests[level]); + sz += sysfs_emit_at(buf, sz, "%s ", pm_tests[level]); } - if (s != buf) + if (sz) /* convert the last space to a newline */ - *(s-1) = '\n'; + sz += sysfs_emit_at(buf, sz, "\n"); - return (s - buf); + return sz; } static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr, @@ -390,7 +390,7 @@ static const char * const suspend_step_names[] = { static ssize_t _name##_show(struct kobject *kobj, \ struct kobj_attribute *attr, char *buf) \ { \ - return sprintf(buf, format_str, suspend_stats._name); \ + return sysfs_emit(buf, format_str, suspend_stats._name); \ } \ static struct kobj_attribute _name = __ATTR_RO(_name) @@ -404,7 +404,7 @@ suspend_attr(max_hw_sleep, "%llu\n"); static ssize_t _name##_show(struct kobject *kobj, \ struct kobj_attribute *attr, char *buf) \ { \ - return sprintf(buf, "%u\n", \ + return sysfs_emit(buf, "%u\n", \ suspend_stats.step_failures[step-1]); \ } \ static struct kobj_attribute _name = __ATTR_RO(_name) @@ -428,7 +428,7 @@ static ssize_t last_failed_dev_show(struct kobject *kobj, index %= REC_FAILED_NUM; last_failed_dev = suspend_stats.failed_devs[index]; - return sprintf(buf, "%s\n", last_failed_dev); + return sysfs_emit(buf, "%s\n", last_failed_dev); } static struct kobj_attribute last_failed_dev = __ATTR_RO(last_failed_dev); @@ -442,7 +442,7 @@ static ssize_t last_failed_errno_show(struct kobject *kobj, index %= REC_FAILED_NUM; last_failed_errno = suspend_stats.errno[index]; - return sprintf(buf, "%d\n", last_failed_errno); + return sysfs_emit(buf, "%d\n", last_failed_errno); } static struct kobj_attribute last_failed_errno = __ATTR_RO(last_failed_errno); @@ -456,7 +456,7 @@ static ssize_t last_failed_step_show(struct kobject *kobj, index %= REC_FAILED_NUM; step = suspend_stats.failed_steps[index]; - return sprintf(buf, "%s\n", suspend_step_names[step]); + return sysfs_emit(buf, "%s\n", suspend_step_names[step]); } static struct kobj_attribute last_failed_step = __ATTR_RO(last_failed_step); @@ -571,7 +571,7 @@ bool pm_print_times_enabled; static ssize_t pm_print_times_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { - return sprintf(buf, "%d\n", pm_print_times_enabled); + return sysfs_emit(buf, "%d\n", pm_print_times_enabled); } static ssize_t pm_print_times_store(struct kobject *kobj, @@ -604,7 +604,7 @@ static ssize_t pm_wakeup_irq_show(struct kobject *kobj, if (!pm_wakeup_irq()) return -ENODATA; - return sprintf(buf, "%u\n", pm_wakeup_irq()); + return sysfs_emit(buf, "%u\n", pm_wakeup_irq()); } power_attr_ro(pm_wakeup_irq); @@ -620,7 +620,7 @@ EXPORT_SYMBOL_GPL(pm_debug_messages_should_print); static ssize_t pm_debug_messages_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { - return sprintf(buf, "%d\n", pm_debug_messages_on); + return sysfs_emit(buf, "%d\n", pm_debug_messages_on); } static ssize_t pm_debug_messages_store(struct kobject *kobj, @@ -668,21 +668,21 @@ struct kobject *power_kobj; static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { - char *s = buf; + ssize_t sz = 0; #ifdef CONFIG_SUSPEND suspend_state_t i; for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++) if (pm_states[i]) - s += sprintf(s,"%s ", pm_states[i]); + sz += sysfs_emit_at(buf, sz, "%s ", pm_states[i]); #endif if (hibernation_available()) - s += sprintf(s, "disk "); - if (s != buf) + sz += sysfs_emit_at(buf, sz, "disk "); + if (sz) /* convert the last space to a newline */ - *(s-1) = '\n'; - return (s - buf); + sz += sysfs_emit_at(buf, sz, "\n"); + return sz; } static suspend_state_t decode_state(const char *buf, size_t n) @@ -782,7 +782,7 @@ static ssize_t wakeup_count_show(struct kobject *kobj, unsigned int val; return pm_get_wakeup_count(&val, true) ? - sprintf(buf, "%u\n", val) : -EINTR; + sysfs_emit(buf, "%u\n", val) : -EINTR; } static ssize_t wakeup_count_store(struct kobject *kobj, @@ -824,17 +824,17 @@ static ssize_t autosleep_show(struct kobject *kobj, suspend_state_t state = pm_autosleep_state(); if (state == PM_SUSPEND_ON) - return sprintf(buf, "off\n"); + return sysfs_emit(buf, "off\n"); #ifdef CONFIG_SUSPEND if (state < PM_SUSPEND_MAX) - return sprintf(buf, "%s\n", pm_states[state] ? + return sysfs_emit(buf, "%s\n", pm_states[state] ? pm_states[state] : "error"); #endif #ifdef CONFIG_HIBERNATION - return sprintf(buf, "disk\n"); + return sysfs_emit(buf, "disk\n"); #else - return sprintf(buf, "error"); + return sysfs_emit(buf, "error\n"); #endif } @@ -903,7 +903,7 @@ int pm_trace_enabled; static ssize_t pm_trace_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { - return sprintf(buf, "%d\n", pm_trace_enabled); + return sysfs_emit(buf, "%d\n", pm_trace_enabled); } static ssize_t @@ -940,7 +940,7 @@ power_attr_ro(pm_trace_dev_match); static ssize_t pm_freeze_timeout_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { - return sprintf(buf, "%u\n", freeze_timeout_msecs); + return sysfs_emit(buf, "%u\n", freeze_timeout_msecs); } static ssize_t pm_freeze_timeout_store(struct kobject *kobj,