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Shutemov" To: Steven Price Cc: linux-mm@kvack.org, Andy Lutomirski , Ard Biesheuvel , Arnd Bergmann , Borislav Petkov , Catalin Marinas , Dave Hansen , Ingo Molnar , James Morse , =?utf-8?B?SsOpcsO0bWU=?= Glisse , Peter Zijlstra , Thomas Gleixner , Will Deacon , x86@kernel.org, "H. Peter Anvin" , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Mark Rutland , "Liang, Kan" , Guo Ren Subject: Re: [PATCH v3 06/34] csky: mm: Add p?d_large() definitions Message-ID: <20190301215128.qqzmyqyzxxatbqgh@kshutemo-mobl1> References: <20190227170608.27963-1-steven.price@arm.com> <20190227170608.27963-7-steven.price@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190227170608.27963-7-steven.price@arm.com> User-Agent: NeoMutt/20180716 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Feb 27, 2019 at 05:05:40PM +0000, Steven Price wrote: > walk_page_range() is going to be allowed to walk page tables other than > those of user space. For this it needs to know when it has reached a > 'leaf' entry in the page tables. This information is provided by the > p?d_large() functions/macros. > > For csky, we don't support large pages, so add a stub returning 0. > > CC: Guo Ren > Signed-off-by: Steven Price > --- > arch/csky/include/asm/pgtable.h | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/arch/csky/include/asm/pgtable.h b/arch/csky/include/asm/pgtable.h > index edfcbb25fd9f..4ffdb6bfbede 100644 > --- a/arch/csky/include/asm/pgtable.h > +++ b/arch/csky/include/asm/pgtable.h > @@ -158,6 +158,8 @@ static inline int pmd_present(pmd_t pmd) > return (pmd_val(pmd) != __pa(invalid_pte_table)); > } > > +#define pmd_large(pmd) (0) Nit: here and in other places, parentheses around 0 is not needed. -- Kirill A. Shutemov