linux-kernel - Re: [PATCH 3/3] io_uring: add support for zone-append

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Message-ID: <20200619152208.GA62406@localhost.localdomain>
Date:   Fri, 19 Jun 2020 18:22:08 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     axboe@...nel.dk
Cc:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        javier.gonz@...sung.com, linux-aio@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 3/3] io_uring: add support for zone-append

> 	uint64_t val = cqe->res; // assuming non-error here
> 
> 	if (cqe->flags & IORING_CQE_F_ZONE_FOO)
> 		val |= (cqe->flags >> 16) << 32ULL;

Jens, ULL in shift doesn't do anything for widening the result.
You need

	val |= (uint64_t)(cqe->flags >> 16) << 32;