Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
MIME-Version: 1.0
References: <CA+G9fYv7fESqpGoeKmHoJsst6wfRNMi2wQLGm+PsjbLDuDjdMQ@mail.gmail.com>
 <CA+G9fYsJThWFAxXTbAcJmjshx+oYxVVd+gMM680hS0X1z37+FQ@mail.gmail.com> <YqItYKEIvsw4Yzjx@carbon>
In-Reply-To: <YqItYKEIvsw4Yzjx@carbon>
From:   Shakeel Butt <shakeelb@google.com>
Date:   Thu, 9 Jun 2022 10:47:35 -0700
Message-ID: <CALvZod6ojDd8Bc0VcyFEk-ZrdkFezvQPUvbGg3wyzae+NOp_4A@mail.gmail.com>
Subject: Re: [next] arm64: boot failed - next-20220606
To:     Roman Gushchin <roman.gushchin@linux.dev>
Cc:     Naresh Kamboju <naresh.kamboju@linaro.org>,
        Linux-Next Mailing List <linux-next@vger.kernel.org>,
        open list <linux-kernel@vger.kernel.org>,
        regressions@lists.linux.dev, lkft-triage@lists.linaro.org,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        linux-mm <linux-mm@kvack.org>,
        Stephen Rothwell <sfr@canb.auug.org.au>,
        Andrew Morton <akpm@linux-foundation.org>,
        Ard Biesheuvel <ardb@kernel.org>,
        Arnd Bergmann <arnd@arndb.de>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Raghuram Thammiraju <raghuram.thammiraju@arm.com>,
        Mark Brown <broonie@kernel.org>, Will Deacon <will@kernel.org>,
        Vasily Averin <vvs@openvz.org>,
        Qian Cai <quic_qiancai@quicinc.com>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

On Thu, Jun 9, 2022 at 10:27 AM Roman Gushchin <roman.gushchin@linux.dev> wrote:
>
[...]
> +struct mem_cgroup *mem_cgroup_from_obj(void *p)
> +{
> +       struct folio *folio;
> +
> +       if (mem_cgroup_disabled())
> +               return NULL;
> +
> +       if (unlikely(is_vmalloc_addr(p)))
> +               folio = page_folio(vmalloc_to_page(p));

Do we need to check for NULL from vmalloc_to_page(p)?

> +       else
> +               folio = virt_to_folio(p);
> +
> +       return mem_cgroup_from_obj_folio(folio, p);
> +}