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;
Message-ID: <6ad10e79-74e5-7c48-d10c-78229187da32@ghiti.fr>
Date:   Wed, 10 May 2023 10:01:13 +0200
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101
 Thunderbird/102.10.0
Subject: Re: [PATCH 14/23] riscv/hugetlb: pte_alloc_huge() pte_offset_huge()
To:     Hugh Dickins <hughd@google.com>,
        Andrew Morton <akpm@linux-foundation.org>
Cc:     Mike Kravetz <mike.kravetz@oracle.com>,
        Mike Rapoport <rppt@kernel.org>,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Matthew Wilcox <willy@infradead.org>,
        David Hildenbrand <david@redhat.com>,
        Suren Baghdasaryan <surenb@google.com>,
        Qi Zheng <zhengqi.arch@bytedance.com>,
        Russell King <linux@armlinux.org.uk>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Greg Ungerer <gerg@linux-m68k.org>,
        Michal Simek <monstr@monstr.eu>,
        Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
        Helge Deller <deller@gmx.de>,
        John David Anglin <dave.anglin@bell.net>,
        "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Alexandre Ghiti <alexghiti@rivosinc.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Heiko Carstens <hca@linux.ibm.com>,
        Christian Borntraeger <borntraeger@linux.ibm.com>,
        Claudio Imbrenda <imbrenda@linux.ibm.com>,
        John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>,
        "David S. Miller" <davem@davemloft.net>,
        Chris Zankel <chris@zankel.net>,
        Max Filippov <jcmvbkbc@gmail.com>, x86@kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org,
        linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org,
        linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
        linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org,
        linux-sh@vger.kernel.org, sparclinux@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org
References: <77a5d8c-406b-7068-4f17-23b7ac53bc83@google.com>
 <d1e54510-9ea2-edf-3851-fa7635ce1e5e@google.com>
Content-Language: en-US
From:   Alexandre Ghiti <alex@ghiti.fr>
In-Reply-To: <d1e54510-9ea2-edf-3851-fa7635ce1e5e@google.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Precedence: bulk

Hi Hugh,

On 5/10/23 06:59, Hugh Dickins wrote:
> pte_alloc_map() expects to be followed by pte_unmap(), but hugetlb omits
> that: to keep balance in future, use the recently added pte_alloc_huge()
> instead; with pte_offset_huge() a better name for pte_offset_kernel().
>
> Signed-off-by: Hugh Dickins <hughd@google.com>
> ---
>   arch/riscv/mm/hugetlbpage.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/riscv/mm/hugetlbpage.c b/arch/riscv/mm/hugetlbpage.c
> index a163a3e0f0d4..80926946759f 100644
> --- a/arch/riscv/mm/hugetlbpage.c
> +++ b/arch/riscv/mm/hugetlbpage.c
> @@ -43,7 +43,7 @@ pte_t *huge_pte_alloc(struct mm_struct *mm,
>   
>   	for_each_napot_order(order) {
>   		if (napot_cont_size(order) == sz) {
> -			pte = pte_alloc_map(mm, pmd, addr & napot_cont_mask(order));
> +			pte = pte_alloc_huge(mm, pmd, addr & napot_cont_mask(order));
>   			break;
>   		}
>   	}
> @@ -90,7 +90,7 @@ pte_t *huge_pte_offset(struct mm_struct *mm,
>   
>   	for_each_napot_order(order) {
>   		if (napot_cont_size(order) == sz) {
> -			pte = pte_offset_kernel(pmd, addr & napot_cont_mask(order));
> +			pte = pte_offset_huge(pmd, addr & napot_cont_mask(order));
>   			break;
>   		}
>   	}


Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>

Thanks,

Alex