From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755230AbbDNU5N (ORCPT ); Tue, 14 Apr 2015 16:57:13 -0400 Received: from aserp1040.oracle.com ([141.146.126.69]:49990 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754479AbbDNU4n (ORCPT ); Tue, 14 Apr 2015 16:56:43 -0400 From: Sasha Levin To: linux-kernel@vger.kernel.org Cc: akpm@linux-foundation.org, kirill@shutemov.name, linux-mm@kvack.org Subject: [RFC 01/11] mm: debug: format flags in a buffer Date: Tue, 14 Apr 2015 16:56:23 -0400 Message-Id: <1429044993-1677-2-git-send-email-sasha.levin@oracle.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1429044993-1677-1-git-send-email-sasha.levin@oracle.com> References: <1429044993-1677-1-git-send-email-sasha.levin@oracle.com> X-Source-IP: aserv0021.oracle.com [141.146.126.233] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Format various flags to a string buffer rather than printing them. This is a helper for later. Signed-off-by: Sasha Levin --- mm/debug.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/mm/debug.c b/mm/debug.c index 3eb3ac2..c9f7dd7 100644 --- a/mm/debug.c +++ b/mm/debug.c @@ -80,6 +80,41 @@ static void dump_flags(unsigned long flags, pr_cont(")\n"); } +static char *format_flags(unsigned long flags, + const struct trace_print_flags *names, int count, + char *buf, char *end) +{ + const char *delim = ""; + unsigned long mask; + int i; + + buf += snprintf(buf, (buf > end ? 0 : end - buf), + "flags: %#lx(", flags); + + /* remove zone id */ + flags &= (1UL << NR_PAGEFLAGS) - 1; + + for (i = 0; i < count && flags; i++) { + mask = names[i].mask; + if ((flags & mask) != mask) + continue; + + flags &= ~mask; + buf += snprintf(buf, (buf > end ? 0 : end - buf), + "%s%s", delim, names[i].name); + delim = "|"; + } + + /* check for left over flags */ + if (flags) + buf += snprintf(buf, (buf > end ? 0 : end - buf), + "%s%#lx", delim, flags); + + buf += snprintf(buf, (buf > end ? 0 : end - buf), ")\n"); + + return buf; +} + void dump_page_badflags(struct page *page, const char *reason, unsigned long badflags) { -- 1.7.10.4