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Message-Id: <20120322160336.66e9a88b.akpm@linux-foundation.org> Date: Thu, 22 Mar 2012 16:03:36 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: Uwe Kleine-König <uwe@...ine-koenig.org> Cc: Lucas De Marchi <lucas.demarchi@...fusion.mobi>, linux-kernel@...r.kernel.org, Greg KH <greg@...ah.com> Subject: Re: [PATCH] telephony/ixj: Fix warning about sequence points On Mon, 19 Mar 2012 11:57:44 +0100 Uwe Kleine-K__nig <uwe@...ine-koenig.org> wrote: > In the statement > > j->caplist[j->caps].handle = j->caps++; > > there is no sequence point between the usage of j->caps on the LHS of the > assignment and the incrementation on its RHS. So it's not defined in Standard C > if j->caps is already incremented when used on the LHS even though the postfix > ++ operator is used. To properly fix that the incrementation has to be done in > a seperate expression. > > This fixes: > drivers/telephony/ixj.c: In function ___add_caps___: > drivers/telephony/ixj.c:5930:38: warning: operation on ___j->caps___ may be undefined [-Wsequence-point] > drivers/telephony/ixj.c:5950:38: warning: operation on ___j->caps___ may be undefined [-Wsequence-point] > drivers/telephony/ixj.c:5954:38: warning: operation on ___j->caps___ may be undefined [-Wsequence-point] > drivers/telephony/ixj.c:5965:39: warning: operation on ___j->caps___ may be undefined [-Wsequence-point] > drivers/telephony/ixj.c:5976:39: warning: operation on ___j->caps___ may be undefined [-Wsequence-point] > drivers/telephony/ixj.c:5988:39: warning: operation on ___j->caps___ may be undefined [-Wsequence-point] > drivers/telephony/ixj.c:5998:38: warning: operation on ___j->caps___ may be undefined [-Wsequence-point] > drivers/telephony/ixj.c:6003:38: warning: operation on ___j->caps___ may be undefined [-Wsequence-point] > drivers/telephony/ixj.c:6008:38: warning: operation on ___j->caps___ may be undefined [-Wsequence-point] > drivers/telephony/ixj.c:6013:38: warning: operation on ___j->caps___ may be undefined [-Wsequence-point] > drivers/telephony/ixj.c:6019:38: warning: operation on ___j->caps___ may be undefined [-Wsequence-point] > drivers/telephony/ixj.c:6026:39: warning: operation on ___j->caps___ may be undefined [-Wsequence-point] > drivers/telephony/ixj.c:6031:39: warning: operation on ___j->caps___ may be undefined [-Wsequence-point] > drivers/telephony/ixj.c:6036:39: warning: operation on ___j->caps___ may be undefined [-Wsequence-point] > drivers/telephony/ixj.c:6041:39: warning: operation on ___j->caps___ may be undefined [-Wsequence-point] > drivers/telephony/ixj.c:6049:39: warning: operation on ___j->caps___ may be undefined [-Wsequence-point] > drivers/telephony/ixj.c:6057:39: warning: operation on ___j->caps___ may be undefined [-Wsequence-point] > drivers/telephony/ixj.c:6065:39: warning: operation on ___j->caps___ may be undefined [-Wsequence-point] > drivers/telephony/ixj.c:6071:39: warning: operation on ___j->caps___ may be undefined [-Wsequence-point] > > Signed-off-by: Uwe Kleine-K__nig <uwe@...ine-koenig.org> > --- > drivers/telephony/ixj.c | 57 +++++++++++++++++++++++++++++++--------------- fyi, ixj.c has been moved into staging/, with a view to removing it altogether. It will be sad to see it go - it has stood as a great example of what not to do ;) And no, I don't now how to find out if anyone is using it either. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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