RE: [PATCH v13 20/22] mm: zswap: Consistently use IS_ERR_OR_NULL() to check acomp_ctx resources.

["Sridhar, Kanchana P" <kanchana.p.sridhar@intel.com>]

> -----Original Message-----
> From: Yosry Ahmed <yosry.ahmed@linux.dev>
> Sent: Thursday, November 13, 2025 12:26 PM
> To: Sridhar, Kanchana P <kanchana.p.sridhar@intel.com>
> Cc: linux-kernel@vger.kernel.org; linux-mm@kvack.org;
> hannes@cmpxchg.org; nphamcs@gmail.com; chengming.zhou@linux.dev;
> usamaarif642@gmail.com; ryan.roberts@arm.com; 21cnbao@gmail.com;
> ying.huang@linux.alibaba.com; akpm@linux-foundation.org;
> senozhatsky@chromium.org; sj@kernel.org; kasong@tencent.com; linux-
> crypto@vger.kernel.org; herbert@gondor.apana.org.au;
> davem@davemloft.net; clabbe@baylibre.com; ardb@kernel.org;
> ebiggers@google.com; surenb@google.com; Accardi, Kristen C
> <kristen.c.accardi@intel.com>; Gomes, Vinicius <vinicius.gomes@intel.com>;
> Feghali, Wajdi K <wajdi.k.feghali@intel.com>; Gopal, Vinodh
> <vinodh.gopal@intel.com>
> Subject: Re: [PATCH v13 20/22] mm: zswap: Consistently use
> IS_ERR_OR_NULL() to check acomp_ctx resources.
> 
> On Tue, Nov 04, 2025 at 01:12:33AM -0800, Kanchana P Sridhar wrote:
> > This patch uses IS_ERR_OR_NULL() in zswap_cpu_comp_prepare() to check
> > for valid acomp/req, thereby making it consistent with
> > acomp_ctx_dealloc().
> 
> Instead of "This patch..":
> 
> Use IS_ERR_OR_NULL() in zswap_cpu_comp_prepare() to check for valid
> acomp/req, making it consistent with acomp_ctx_dealloc().
> 
> >
> > This is based on this earlier comment [1] from Yosry, when reviewing v8.
> 
> Drop this statement, it loses its meaning after the code is merged.
> 
> With those changes:
> Acked-by: Yosry Ahmed <yosry.ahmed@linux.dev>

Sounds great, and thanks for the Ack!

Thanks,
Kanchana

> 
> >
> > [1] https://patchwork.kernel.org/comment/26282128/
> >
> > Signed-off-by: Kanchana P Sridhar <kanchana.p.sridhar@intel.com>
> > ---
> >  mm/zswap.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/mm/zswap.c b/mm/zswap.c
> > index 87d50786f61f..cb384eb7c815 100644
> > --- a/mm/zswap.c
> > +++ b/mm/zswap.c
> > @@ -780,7 +780,7 @@ static int zswap_cpu_comp_prepare(unsigned int
> cpu, struct hlist_node *node)
> >  		return ret;
> >
> >  	acomp_ctx->acomp = crypto_alloc_acomp_node(pool->tfm_name, 0,
> 0, cpu_to_node(cpu));
> > -	if (IS_ERR(acomp_ctx->acomp)) {
> > +	if (IS_ERR_OR_NULL(acomp_ctx->acomp)) {
> >  		pr_err("could not alloc crypto acomp %s : %ld\n",
> >  				pool->tfm_name, PTR_ERR(acomp_ctx-
> >acomp));
> >  		ret = PTR_ERR(acomp_ctx->acomp);
> > @@ -789,7 +789,7 @@ static int zswap_cpu_comp_prepare(unsigned int
> cpu, struct hlist_node *node)
> >  	acomp_ctx->is_sleepable = acomp_is_async(acomp_ctx->acomp);
> >
> >  	acomp_ctx->req = acomp_request_alloc(acomp_ctx->acomp);
> > -	if (!acomp_ctx->req) {
> > +	if (IS_ERR_OR_NULL(acomp_ctx->req)) {
> >  		pr_err("could not alloc crypto acomp_request %s\n",
> >  		       pool->tfm_name);
> >  		goto fail;
> > --
> > 2.27.0
> >