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b=XsS7whYVEozZ3YLFpFFcGaoNfReDX1brkr/7JIBgcT0QIQ8ij5zLiLdifdCqZWgx9 +fRa5XDq62q/SW15wAwOBYAjGhvbHfwQywREwed5Sx+kvac45jdB2kxHFIR7JxfzXT tOa9/Y/Nw4WNsnLHtfUUyu4pWxuosDRINvT50+v+EqY6h4R1x5iSxvhJ0khYZYnzSU fLrkjRkXjLQrWAhCjcgzP2Xmv/NGzCLbCPLwPACHv1zadE8qCjp6ZbkT6HUOGe25JX b6PPS1W3jk3LcbB/DzpTTQCjW60A8LKchRQoqL0NaHEf92rwUVU+3ciJu8lwYibVn/ VxqFN7FHjwnfQ== From: Pratyush Yadav To: Tal Zussman Cc: Andrew Morton , Baoquan He , Mike Rapoport , Pasha Tatashin , Pratyush Yadav , Dave Young , linux-mm@kvack.org, linux-s390@vger.kernel.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: Re: [PATCH] vmcore: convert mmap_vmcore_fault() to use folios In-Reply-To: <20260915-vmcore-fault-folio-v1-1-a0cb6278670f@columbia.edu> (Tal Zussman's message of "Tue, 15 Sep 2026 19:42:15 -0400") References: <20260915-vmcore-fault-folio-v1-1-a0cb6278670f@columbia.edu> Date: Tue, 22 Sep 2026 13:59:06 +0200 Message-ID: <2vxzh5jh5wfp.fsf@kernel.org> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Rspam-User: X-Stat-Signature: j1srncpz63jwt1onawtixdyar1n7t5za X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: C9BC120004 X-HE-Tag: 1790078350-70343 X-HE-Meta: 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 iTrbQRs/ XTFRdEwhBhPveb5TtKqAZ7w1ZBBX4GJsjyfXqY5xURV/gZr58i+/VF3dCqYtBkJeznyeka83JcIHIeu73vwvWkdWGNRPuqy0aIdd4K0k0SflHHN38DjTlA2XGo4Ci1aNp584KfrVfR55BfrVmPKKtE7lMMw/VzMfugD4MU6mNGClGr4lCJhjNAHkPu3Qd/kcoLDKZtu0NUrEIptFfGBr7vlq0fR/K28j8OUYUP95QPsbAnYZrLyhhbzn8CSMNPp5KCuqcprh9W5+D3a+WCNXML3q9lGNSMkJQfDJa Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Sep 15 2026, Tal Zussman wrote: > Use a folio for the page cache page the s390 fault handler reads the > old kernel's memory into. This removes four compound_head() calls and > one of the last callers of find_or_create_page(). > > The vmcore mapping only has order-0 folios, so the logic is unchanged. > > Compile tested for s390. > > Signed-off-by: Tal Zussman Acked-by: Pratyush Yadav [...] -- Regards, Pratyush Yadav