linux-kernel - Re: [PATCH] mm/hugetlb.c: remove dead store in demote_size

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Message-ID: <20211004034441.GA114074@ubuntu>
Date:   Mon, 4 Oct 2021 10:44:41 +0700
From:   Nghia Le <nghialm78@...il.com>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     Matthew Wilcox <willy@...radead.org>, akpm@...ux-foundation.org,
        nathan@...nel.org, ndesaulniers@...gle.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        lukas.bulwahn@...il.com, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] mm/hugetlb.c: remove dead store in demote_size_show()

On Sun, Oct 03, 2021 at 07:36:54PM -0700, Mike Kravetz wrote:
> On 10/3/21 6:54 AM, Matthew Wilcox wrote:
> > On Sun, Oct 03, 2021 at 06:41:13PM +0700, Nghia Le wrote:
> >>  {
> >>  	struct hstate *h;
> >> -	unsigned long demote_size;
> >>  	int nid;
> >>  
> >>  	h = kobj_to_hstate(kobj, &nid);
> >> -	demote_size = h->demote_order;
> >>  
> >>  	return sysfs_emit(buf, "%lukB\n",
> >>  			(unsigned long)(PAGE_SIZE << h->demote_order) / SZ_1K);
> > 
> > I'd suggest this function would look better written as:
> > 
> > 	int nid;
> > 	struct hstate *h = kobj_to_hstate(kobj, &nid);
> > 	unsigned long demote_size = (PAGE_SIZE << h->demote_order) / SZ_1K;
> > 
> > 	return sysfs_emit(buf, "%lukB\n", demote_size);
> >
Thanks Matthew for the clean code.
> 
> Thank you Nghia Le for spotting this, and thank you Matthew for the
> suggestion.
> 
> This is still just in Andrew's tree and subject to modification before
> the next merge window.  I am still expecting additional comments on the
> series.
> 
> If another version of the series is needed, I will include Matthew's
> suggestion.   If not, I will ask Andrew how he would prefer to fold in
> the changes.
> -- 
> Mike Kravetz
Thanks Mike, so we will wait further comments from Andrew and others.