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DKIM_TRACE(0.00)[suse.de:+]; MISSING_XM_UA(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:dkim] X-Rspamd-Action: no action X-Rspamd-Queue-Id: 6711B1FCF9 X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-kernel@vger.kernel.org, Nicholas Piggin , linux-mm@kvack.org, Peter Xu , Jason Gunthorpe , Andrew Morton , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Sun, May 26, 2024 at 11:22:23AM +0200, Christophe Leroy wrote: > On powerpc 8xx huge_ptep_get() will need to know whether the given > ptep is a PTE entry or a PMD entry. This cannot be known with the > PMD entry itself because there is no easy way to know it from the > content of the entry. > > So huge_ptep_get() will need to know either the size of the page > or get the pmd. > > In order to be consistent with huge_ptep_get_and_clear(), give > mm and address to huge_ptep_get(). > > Signed-off-by: Christophe Leroy > --- > v2: Add missing changes in arch implementations > v3: Fixed a comment in ARM and missing changes in S390 > --- > arch/arm/include/asm/hugetlb-3level.h | 4 +-- > arch/arm64/include/asm/hugetlb.h | 2 +- > arch/arm64/mm/hugetlbpage.c | 2 +- > arch/riscv/include/asm/hugetlb.h | 2 +- > arch/riscv/mm/hugetlbpage.c | 2 +- > arch/s390/include/asm/hugetlb.h | 4 +-- > arch/s390/mm/hugetlbpage.c | 4 +-- I was wondering whether we could do something similar for what we did in patch#1, so we do not touch architectures code. > diff --git a/mm/gup.c b/mm/gup.c > index 1611e73b1121..86b5105b82a1 100644 > --- a/mm/gup.c > +++ b/mm/gup.c > @@ -2812,7 +2812,7 @@ static int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr, > if (pte_end < end) > end = pte_end; > > - pte = huge_ptep_get(ptep); > + pte = huge_ptep_get(NULL, addr, ptep); I know that after this series all this code is gone, but I was not sure about the behaviour between this patch and the last one. It made me nervous, until I realized that this code is only used on CONFIG_ARCH_HAS_HUGEPD, which should not be the case anymore for 8xx after patch#8, and since 8xx is the only one that will use the mm parameter from huge_ptep_get, we are all good. -- Oscar Salvador SUSE Labs