From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chen Gang Subject: [PATCH] kernel/power/hibernate.c: be sure of 'start' is not bigger than 'stop' Date: Mon, 21 Apr 2014 21:40:27 +0800 Message-ID: <53551FCB.3030109@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mail-pa0-f54.google.com ([209.85.220.54]:62629 "EHLO mail-pa0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750775AbaDUNki (ORCPT ); Mon, 21 Apr 2014 09:40:38 -0400 Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: Guan Xuetao , "Rafael J. Wysocki" , len.brown@intel.com, pavel@ucw.cz Cc: "linux-pm@vger.kernel.org" , "linux-kernel@vger.kernel.org" =46or do_div(), it need 'u64' type, which means the outside must be sur= e of 'start' is not bigger than 'stop', or it will report warning. The related warning (with allmodconfig for unicore32): CC kernel/power/hibernate.o kernel/power/hibernate.c: In function =91swsusp_show_speed=92: kernel/power/hibernate.c:237: warning: comparison of distinct pointer= types lacks a cast Signed-off-by: Chen Gang --- kernel/power/hibernate.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c index f4f2073..0dec9b7 100644 --- a/kernel/power/hibernate.c +++ b/kernel/power/hibernate.c @@ -228,12 +228,17 @@ static void platform_recover(int platform_mode) void swsusp_show_speed(struct timeval *start, struct timeval *stop, unsigned nr_pages, char *msg) { - s64 elapsed_centisecs64; + u64 elapsed_centisecs64; int centisecs; int k; int kps; =20 elapsed_centisecs64 =3D timeval_to_ns(stop) - timeval_to_ns(start); + if ((s64)elapsed_centisecs64 < 0) { + printk(KERN_ERR "PM: stop: %llu < start %llu\n", + timeval_to_ns(stop), timeval_to_ns(start)); + return; + } do_div(elapsed_centisecs64, NSEC_PER_SEC / 100); centisecs =3D elapsed_centisecs64; if (centisecs =3D=3D 0) --=20 1.9.2.459.g68773ac