linux-kernel - Re: [PATCH 2/5] swiotlb: fix compile warning

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Date:	Wed, 25 Mar 2009 13:45:03 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	beckyb@...nel.crashing.org, linux-kernel@...r.kernel.org,
	ian.campbell@...rix.com, jeremy@...p.org
Subject: Re: [PATCH 2/5] swiotlb: fix compile warning


* FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> wrote:

> On Tue, 24 Mar 2009 22:42:33 -0500
> Becky Bruce <beckyb@...nel.crashing.org> wrote:
> 
> > 
> > On Mar 24, 2009, at 9:58 PM, FUJITA Tomonori wrote:
> > 
> > > On Tue, 24 Mar 2009 16:28:43 -0500
> > > Becky Bruce <beckyb@...nel.crashing.org> wrote:
> > >
> > >> Squash a build warning seen on 32-bit powerpc caused by calling min()
> > >> with 2 different types.  Cast the first arg to size_t, which is the
> > >> type of the second, and should be portable across architectures.
> > >>
> > >> Signed-off-by: Becky Bruce <beckyb@...nel.crashing.org>
> > >> ---
> > >> lib/swiotlb.c |    2 +-
> > >> 1 files changed, 1 insertions(+), 1 deletions(-)
> > >>
> > >> diff --git a/lib/swiotlb.c b/lib/swiotlb.c
> > >> index f59cf30..62f5f75 100644
> > >> --- a/lib/swiotlb.c
> > >> +++ b/lib/swiotlb.c
> > >> @@ -341,7 +341,7 @@ static void swiotlb_bounce(phys_addr_t phys,  
> > >> char *dma_addr, size_t size,
> > >> 		unsigned long flags;
> > >>
> > >> 		while (size) {
> > >> -			sz = min(PAGE_SIZE - offset, size);
> > >> +			sz = min((size_t)(PAGE_SIZE - offset), size);
> > >>
> > >> 			local_irq_save(flags);
> > >> 			buffer = kmap_atomic(pfn_to_page(pfn),
> > >
> > > ?
> > >
> > > diff --git a/lib/swiotlb.c b/lib/swiotlb.c
> > > index f59cf30..fa62498 100644
> > > --- a/lib/swiotlb.c
> > > +++ b/lib/swiotlb.c
> > > @@ -341,7 +341,7 @@ static void swiotlb_bounce(phys_addr_t phys,  
> > > char *dma_addr, size_t size,
> > > 		unsigned long flags;
> > >
> > > 		while (size) {
> > > -			sz = min(PAGE_SIZE - offset, size);
> > > +			sz = min_t(size_t, PAGE_SIZE - offset, size);
> > >
> > > 			local_irq_save(flags);
> > > 			buffer = kmap_atomic(pfn_to_page(pfn),
> > 
> > OK, we're clearly pointed at different trees here, and it looks like  
> > I'm behind - this patch is based on Ingo's master.  Which tree has  
> > this change?
> 
> I also use tip/master. I think that we are on the same page. No 
> tree has this change. I just send it because I'm not sure why you 
> don't use min_t().

yes, min_t() is safer and cleaner than min()+cast.

	Ingo
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