linux-kernel - Re: [RFC PATCH 08/21] zram: Migrate to acomp compression API

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Message-ID: <ZLpOTTrYTxfMqYen@corigine.com>
Date:   Fri, 21 Jul 2023 10:22:21 +0100
From:   Simon Horman <simon.horman@...igine.com>
To:     Ard Biesheuvel <ardb@...nel.org>
Cc:     linux-crypto@...r.kernel.org,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Eric Biggers <ebiggers@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Haren Myneni <haren@...ibm.com>,
        Nick Terrell <terrelln@...com>,
        Minchan Kim <minchan@...nel.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Jens Axboe <axboe@...nel.dk>,
        Giovanni Cabiddu <giovanni.cabiddu@...el.com>,
        Richard Weinberger <richard@....at>,
        David Ahern <dsahern@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        qat-linux@...el.com, linuxppc-dev@...ts.ozlabs.org,
        linux-mtd@...ts.infradead.org, netdev@...r.kernel.org
Subject: Re: [RFC PATCH 08/21] zram: Migrate to acomp compression API

On Tue, Jul 18, 2023 at 02:58:34PM +0200, Ard Biesheuvel wrote:

...

> @@ -1618,9 +1614,7 @@ static int zram_recompress(struct zram *zram, u32 index, struct page *page,
>  
>  		num_recomps++;
>  		zstrm = zcomp_stream_get(zram->comps[prio]);
> -		src = kmap_atomic(page);
> -		ret = zcomp_compress(zstrm, src, &comp_len_new);
> -		kunmap_atomic(src);
> +		ret = zcomp_compress(zstrm, page, &comp_len_new);

Hi Ard,

src appears to be unused in this function with this change.

>  
>  		if (ret) {
>  			zcomp_stream_put(zram->comps[prio]);

...