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[23.128.96.18]) by mx.google.com with ESMTP id v9si18908633ejh.703.2021.06.02.06.51.33; Wed, 02 Jun 2021 06:51:56 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=hisilicon.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229966AbhFBNu6 (ORCPT + 99 others); Wed, 2 Jun 2021 09:50:58 -0400 Received: from szxga02-in.huawei.com ([45.249.212.188]:3514 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229640AbhFBNuy (ORCPT ); Wed, 2 Jun 2021 09:50:54 -0400 Received: from dggeme759-chm.china.huawei.com (unknown [172.30.72.57]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4Fw9Kn52LCzYs25; Wed, 2 Jun 2021 21:46:21 +0800 (CST) Received: from localhost.localdomain (10.69.192.56) by dggeme759-chm.china.huawei.com (10.3.19.105) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2; Wed, 2 Jun 2021 21:49:06 +0800 From: Tian Tao To: , , , CC: , , , Tian Tao Subject: [PATCH v2 1/3] lib: bitmap: introduce bitmap_print_to_buf Date: Wed, 2 Jun 2021 21:48:52 +0800 Message-ID: <1622641734-22538-2-git-send-email-tiantao6@hisilicon.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1622641734-22538-1-git-send-email-tiantao6@hisilicon.com> References: <1622641734-22538-1-git-send-email-tiantao6@hisilicon.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.69.192.56] X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) To dggeme759-chm.china.huawei.com (10.3.19.105) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org New API bitmap_print_to_buf() with bin_attribute to avoid maskp exceeding PAGE_SIZE. bitmap_print_to_pagebuf() is a special case of bitmap_print_to_buf(), so in bitmap_print_to_pagebuf() call bitmap_print_to_buf(). Signed-off-by: Tian Tao --- include/linux/bitmap.h | 3 +++ include/linux/cpumask.h | 21 +++++++++++++++++++++ lib/bitmap.c | 38 ++++++++++++++++++++++++++++++++++++-- 3 files changed, 60 insertions(+), 2 deletions(-) diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h index 70a9324..bc401bd9b 100644 --- a/include/linux/bitmap.h +++ b/include/linux/bitmap.h @@ -219,6 +219,9 @@ extern unsigned int bitmap_ord_to_pos(const unsigned long *bitmap, unsigned int extern int bitmap_print_to_pagebuf(bool list, char *buf, const unsigned long *maskp, int nmaskbits); +extern int bitmap_print_to_buf(bool list, char *buf, + const unsigned long *maskp, int nmaskbits, loff_t off, size_t count); + #define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1))) #define BITMAP_LAST_WORD_MASK(nbits) (~0UL >> (-(nbits) & (BITS_PER_LONG - 1))) diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h index 383684e..56852f2 100644 --- a/include/linux/cpumask.h +++ b/include/linux/cpumask.h @@ -928,6 +928,27 @@ cpumap_print_to_pagebuf(bool list, char *buf, const struct cpumask *mask) nr_cpu_ids); } +/** + * cpumap_print_to_buf - copies the cpumask into the buffer either + * as comma-separated list of cpus or hex values of cpumask + * @list: indicates whether the cpumap must be list + * @mask: the cpumask to copy + * @buf: the buffer to copy into + * @off: in the string from which we are copying, We copy to @buf + off + * @count: the maximum number of bytes to print + * + * The role of cpumap_print_to_buf and cpumap_print_to_pagebuf is + * the same, the difference is that buf of bitmap_print_to_buf + * can be more than one pagesize. + */ +static inline ssize_t +cpumap_print_to_buf(bool list, char *buf, const struct cpumask *mask, + loff_t off, size_t count) +{ + return bitmap_print_to_buf(list, buf, cpumask_bits(mask), + nr_cpu_ids, off, count); +} + #if NR_CPUS <= BITS_PER_LONG #define CPU_MASK_ALL \ (cpumask_t) { { \ diff --git a/lib/bitmap.c b/lib/bitmap.c index 75006c4..cb64e66 100644 --- a/lib/bitmap.c +++ b/lib/bitmap.c @@ -460,6 +460,40 @@ int bitmap_parse_user(const char __user *ubuf, EXPORT_SYMBOL(bitmap_parse_user); /** + * bitmap_print_to_buf - convert bitmap to list or hex format ASCII string + * @list: indicates whether the bitmap must be list + * @buf: the kernel space buffer to read to + * @maskp: pointer to bitmap to convert + * @nmaskbits: size of bitmap, in bits + * @off: offset in data buffer below + * @count: the maximum number of bytes to print + * + * The role of bitmap_print_to_buf and bitmap_print_to_pagebuf() is + * the same, the difference is that buf of bitmap_print_to_buf() + * can be more than one pagesize. + */ +int bitmap_print_to_buf(bool list, char *buf, const unsigned long *maskp, + int nmaskbits, loff_t off, size_t count) +{ + int size; + void *data; + const char *fmt = list ? "%*pbl\n" : "%*pb\n"; + + if (off == LLONG_MAX && count == PAGE_SIZE - offset_in_page(buf)) + return scnprintf(buf, count, fmt, nmaskbits, maskp); + + data = kasprintf(GFP_KERNEL, fmt, nmaskbits, maskp); + if (!data) + return -ENOMEM; + + size = memory_read_from_buffer(buf, count, &off, data, strlen(data)); + kfree(data); + + return size; +} +EXPORT_SYMBOL(bitmap_print_to_buf); + +/** * bitmap_print_to_pagebuf - convert bitmap to list or hex format ASCII string * @list: indicates whether the bitmap must be list * @buf: page aligned buffer into which string is placed @@ -480,8 +514,8 @@ int bitmap_print_to_pagebuf(bool list, char *buf, const unsigned long *maskp, { ptrdiff_t len = PAGE_SIZE - offset_in_page(buf); - return list ? scnprintf(buf, len, "%*pbl\n", nmaskbits, maskp) : - scnprintf(buf, len, "%*pb\n", nmaskbits, maskp); + return bitmap_print_to_buf(list, buf, maskp, nmaskbits, + LLONG_MAX, len); } EXPORT_SYMBOL(bitmap_print_to_pagebuf); -- 2.7.4