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b=lLUj0RXqa3eqVSWa8s3jcLRzvPAoxXywuBBbtB7eGxbsslO52vc2uQi76DXyAQ/Uo 1k6hzKcGoTWdwSskzPk3fXkyS9wDJBndvI1/c30aawuCArJtFmFwmY9YZgO2W5sYhA VtkeOJPuAyGMaSKSmRPT7NYc5h7dJub2XY4T0rfN9irI/IK/bPx8eTLkcQiHcRn54G e+UzX8IH0ElSGDmyTkrpcdLutlBYQD1dnghqosFDVj3CpzhE6Z8XE+HWqUiG+4qFve LqZ95gSpLLgfHSfmBOupEsM9hAon1Vx2suTZp2jDGzZYloHcDfyZjpnpdTJkeyW3Z7 UyXmhFnuBFB0g== Message-ID: <50b0de85-0bb9-4d09-b32e-31a3a4661379@kernel.org> Date: Tue, 7 Jul 2026 16:28:14 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 5/5] mm/rmap: add anon folio unmap dispatcher function To: Dev Jain , akpm@linux-foundation.org, ljs@kernel.org, muchun.song@linux.dev, osalvador@suse.de Cc: riel@surriel.com, liam@infradead.org, vbabka@kernel.org, harry@kernel.org, jannh@google.com, lance.yang@linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, ryan.roberts@arm.com, anshuman.khandual@arm.com References: <20260707121128.373192-1-dev.jain@arm.com> <20260707121128.373192-6-dev.jain@arm.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Stat-Signature: cwg668qte6sshox7e6ak51gyahubkfwr X-Rspamd-Queue-Id: 0D5EEC0005 X-Rspam-User: X-Rspamd-Server: rspam07 X-HE-Tag: 1783434499-799489 X-HE-Meta: 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 Qye+C/MD Cf6dkISRB4nDu7syqBnaHCv7vIKd9hi+KpnUWebmgizKNGgCuNNAV+TBsshPWGZ3+RmU+l9Pa+5kbpaGysL9sgxd6sf5H3/18wQPiOCJ4wA8ZojNLuIriog9YaNw4x18qtsQNw70w9A8908TpqCDxkTeSxRvszsnE2n/BudiYEPoIbx7bzd8CzZgJ43/6SaRL/GX8DSasvLmJ0QVTrydh1dw5T8AtKNKD6o1sRUVtccI7Meb5u/eT2IHkfGZ659FV5DrbJqbwQuBpHovvjBGiHJNSTcU2+tOoyl6KzgqOfqFdT7iwoB2+ElmiVZGoyFzewPkO Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7/7/26 14:11, Dev Jain wrote: > Add ttu_anon_folio() as the common entry point for anonymous folio > unmapping. It dispatches to the lazyfree or swapbacked helper as > appropriate, and centralizes restoration of cleared PTEs on failure. > > No functional change intended. > > Signed-off-by: Dev Jain > --- > mm/rmap.c | 59 +++++++++++++++++++++++++++++++++---------------------- > 1 file changed, 36 insertions(+), 23 deletions(-) > > diff --git a/mm/rmap.c b/mm/rmap.c > index ade78df5be2bd..f021ecd51a4a2 100644 > --- a/mm/rmap.c > +++ b/mm/rmap.c > @@ -2171,6 +2171,40 @@ static inline bool ttu_anon_swapbacked_folio(struct vm_area_struct *vma, struct > return true; > } > > +static inline bool ttu_anon_folio(struct vm_area_struct *vma, struct folio *folio, > + struct page *subpage, unsigned long address, pte_t *ptep, > + pte_t pteval, unsigned long nr_pages) > +{ > + struct mm_struct *mm = vma->vm_mm; > + bool ret; > + > + /* > + * Store the swap location in the pte. > + * See handle_pte_fault() ... > + */ > + if (unlikely(folio_test_swapbacked(folio) != > + folio_test_swapcache(folio))) { > + WARN_ON_ONCE(1); > + return false; > + } > + > + /* MADV_FREE page check */ > + if (!folio_test_swapbacked(folio)) { > + ret = ttu_anon_lazyfree_folio(vma, folio); > + if (ret) > + add_mm_counter(mm, MM_ANONPAGES, -nr_pages); Can't the be handled in there as well? > + } else { > + /* nr_pages > 1 not supported yet */ > + ret = ttu_anon_swapbacked_folio(vma, folio, subpage, address, > + ptep, pteval); > + } > + > + if (!ret) > + set_ptes(mm, address, ptep, pteval, nr_pages); It might be cleaner to do that in the caller, where we actually removed the ptes in the first place? > + > + return ret; > +} > + > /* > * @arg: enum ttu_flags will be passed to this argument > */ > @@ -2351,31 +2385,10 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma, > */ > dec_mm_counter(mm, mm_counter(folio)); > } else if (folio_test_anon(folio)) { > - /* > - * Store the swap location in the pte. > - * See handle_pte_fault() ... > - */ > - if (unlikely(folio_test_swapbacked(folio) != > - folio_test_swapcache(folio))) { > - WARN_ON_ONCE(1); > + if (!ttu_anon_folio(vma, folio, subpage, address, > + pvmw.pte, pteval, nr_pages)) > goto walk_abort; > - } > > - /* MADV_FREE page check */ > - if (!folio_test_swapbacked(folio)) { > - if (!ttu_anon_lazyfree_folio(vma, folio)) { > - set_ptes(mm, address, pvmw.pte, pteval, nr_pages); > - goto walk_abort; > - } > - add_mm_counter(mm, MM_ANONPAGES, -nr_pages); > - goto finish_unmap; > - } > - > - if (!ttu_anon_swapbacked_folio(vma, folio, subpage, address, > - pvmw.pte, pteval)) { > - set_pte_at(mm, address, pvmw.pte, pteval); > - goto walk_abort; > - } > goto finish_unmap; > } else { > /* Very nice. -- Cheers, David