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

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Date:   Sun, 3 Oct 2021 14:54:56 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Nghia Le <nghialm78@...il.com>
Cc:     mike.kravetz@...cle.com, 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 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);