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Date:   Sun, 23 Aug 2020 16:21:30 +0100
From:   Matthew Wilcox <>
To:     Giuseppe Scrivano <>
Cc:     Andrew Morton <>,
        Xu Wang <>,,, Tejun Heo <>
Subject: Re: [PATCH] hugetlb_cgroup: convert comma to semicolon

On Wed, Aug 19, 2020 at 10:14:11AM +0200, Giuseppe Scrivano wrote:
> >> -	cft->file_offset = offsetof(struct hugetlb_cgroup, events_file[idx]),
> >> +	cft->file_offset = offsetof(struct hugetlb_cgroup, events_file[idx]);
> >>  	cft->flags = CFTYPE_NOT_ON_ROOT;
> I think in this case having two expressions as part of the same
> statement is equivalent to having two separate statements.  Both
> cft->file_offset and cft->flags get the expected value.

That's not how the comma operator works.

It will evaluate offsetof(struct hugetlb_cgroup, events_file[idx]) and
then discard the result.  Since it has no side-effects, this is effectively

	cft->file_offset = cft->flags = CFTYPE_NOT_ON_ROOT;

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