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Mon, 27 Apr 2020 19:45:38 -0400 X-MC-Unique: 3LIp2cJjPdOmC7vAIE7Rag-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id E28DE107ACF4; Mon, 27 Apr 2020 23:45:36 +0000 (UTC) Received: from localhost.localdomain (vpn2-54-127.bne.redhat.com [10.64.54.127]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 164A160638; Mon, 27 Apr 2020 23:45:34 +0000 (UTC) Subject: Re: [PATCH] arm64/mm: Use phys_to_page() to access pgtable memory To: Mark Rutland References: <20200424044854.15760-1-gshan@redhat.com> <20200424092208.GA1167@C02TD0UTHF1T.local> From: Gavin Shan Message-ID: Date: Tue, 28 Apr 2020 09:45:32 +1000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.0 MIME-Version: 1.0 In-Reply-To: <20200424092208.GA1167@C02TD0UTHF1T.local> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200427_164544_698621_36A1F453 X-CRM114-Status: GOOD ( 18.72 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Gavin Shan Cc: catalin.marinas@arm.com, shan.gavin@gmail.com, will@kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Mark, On 4/24/20 7:22 PM, Mark Rutland wrote: > On Fri, Apr 24, 2020 at 02:48:54PM +1000, Gavin Shan wrote: >> The macros {pgd, pud, pmd}_page() retrieves the page struct of the >> corresponding page frame, which is reserved as page table. There >> is already a macro (phys_to_page), defined in memory.h, to convert >> the physical address to the page struct. So it's reasonable to >> use that in pgtable.h. >> >> Signed-off-by: Gavin Shan > > It might be worth pointing out that phys_to_page() is defined as: > > #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) > > ... so this is obviously equivalent. > > Given that, and given we already explicitly include , this > looks like a nice cleanup to me. > > With or without the commit message addition: > > Reviewed-by: Mark Rutland > > Mark. > Thanks for the comments. I will post v2 shortly, which has the improved commit log and your reviewed-by. Thanks, Gavin >> --- >> arch/arm64/include/asm/pgtable.h | 6 +++--- >> 1 file changed, 3 insertions(+), 3 deletions(-) >> >> diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h >> index 538c85e62f86..8c20e2bd6287 100644 >> --- a/arch/arm64/include/asm/pgtable.h >> +++ b/arch/arm64/include/asm/pgtable.h >> @@ -508,7 +508,7 @@ static inline void pte_unmap(pte_t *pte) { } >> #define pte_set_fixmap_offset(pmd, addr) pte_set_fixmap(pte_offset_phys(pmd, addr)) >> #define pte_clear_fixmap() clear_fixmap(FIX_PTE) >> >> -#define pmd_page(pmd) pfn_to_page(__phys_to_pfn(__pmd_to_phys(pmd))) >> +#define pmd_page(pmd) phys_to_page(__pmd_to_phys(pmd)) >> >> /* use ONLY for statically allocated translation tables */ >> #define pte_offset_kimg(dir,addr) ((pte_t *)__phys_to_kimg(pte_offset_phys((dir), (addr)))) >> @@ -566,7 +566,7 @@ static inline phys_addr_t pud_page_paddr(pud_t pud) >> #define pmd_set_fixmap_offset(pud, addr) pmd_set_fixmap(pmd_offset_phys(pud, addr)) >> #define pmd_clear_fixmap() clear_fixmap(FIX_PMD) >> >> -#define pud_page(pud) pfn_to_page(__phys_to_pfn(__pud_to_phys(pud))) >> +#define pud_page(pud) phys_to_page(__pud_to_phys(pud)) >> >> /* use ONLY for statically allocated translation tables */ >> #define pmd_offset_kimg(dir,addr) ((pmd_t *)__phys_to_kimg(pmd_offset_phys((dir), (addr)))) >> @@ -624,7 +624,7 @@ static inline phys_addr_t pgd_page_paddr(pgd_t pgd) >> #define pud_set_fixmap_offset(pgd, addr) pud_set_fixmap(pud_offset_phys(pgd, addr)) >> #define pud_clear_fixmap() clear_fixmap(FIX_PUD) >> >> -#define pgd_page(pgd) pfn_to_page(__phys_to_pfn(__pgd_to_phys(pgd))) >> +#define pgd_page(pgd) phys_to_page(__pgd_to_phys(pgd)) >> >> /* use ONLY for statically allocated translation tables */ >> #define pud_offset_kimg(dir,addr) ((pud_t *)__phys_to_kimg(pud_offset_phys((dir), (addr)))) >> -- >> 2.23.0 >> > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel