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Fri, 24 Jul 2026 10:20:22 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id mMU+GGY8Y2oSaQAAD6G6ig (envelope-from ); Fri, 24 Jul 2026 10:20:22 +0000 From: Pedro Falcato To: Andrew Morton , David Hildenbrand Cc: Pedro Falcato , Catalin Marinas , Will Deacon , "James E.J. Bottomley" , Helge Deller , Madhavan Srinivasan , Michael Ellerman , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , "Matthew Wilcox (Oracle)" , Jan Kara , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Kevin Brodsky , Muhammad Usama Anjum , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Subject: [PATCH 1/5] mm: constify generic pte_get*() Date: Fri, 24 Jul 2026 11:20:13 +0100 Message-ID: <20260724102017.141532-2-pfalcato@suse.de> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260724102017.141532-1-pfalcato@suse.de> References: <20260724102017.141532-1-pfalcato@suse.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Spamd-Result: default: False [-1.51 / 50.00]; BAYES_HAM(-3.00)[100.00%]; SUSPICIOUS_RECIPS(1.50)[]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:rdns,imap1.dmz-prg2.suse.org:helo,suse.de:email,suse.de:mid,suse.de:dkim]; FUZZY_RATELIMITED(0.00)[rspamd.com]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; RCPT_COUNT_TWELVE(0.00)[33]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; R_RATELIMIT(0.00)[to_ip_from(RL764437jfm1qe6abtk9nwyx8m)]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; DKIM_TRACE(0.00)[suse.de:+]; FREEMAIL_CC(0.00)[suse.de,arm.com,kernel.org,HansenPartnership.com,gmx.de,linux.ibm.com,ellerman.id.au,infradead.org,google.com,suse.com,suse.cz,nvidia.com,linux.alibaba.com,redhat.com,linux.dev,lists.infradead.org,vger.kernel.org,lists.ozlabs.org,kvack.org]; RCVD_TLS_ALL(0.00)[]; TO_DN_SOME(0.00)[]; FREEMAIL_ENVRCPT(0.00)[gmx.de] X-Spam-Flag: NO X-Spam-Score: -1.51 X-Spam-Level: X-Rspamd-Queue-Id: D52A57B6C3 X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Action: no action Content-Type: text/plain; charset="utf-8" None of the helpers need write access to the PTE. Constifying the param allows for const typesafety. Signed-off-by: Pedro Falcato --- include/linux/pgtable.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index 8c093c119e5a..dc418553e57a 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -490,7 +490,7 @@ static inline int pudp_set_access_flags(struct vm_area_= struct *vma, #endif =20 #ifndef ptep_get -static inline pte_t ptep_get(pte_t *ptep) +static inline pte_t ptep_get(const pte_t *ptep) { return READ_ONCE(*ptep); } @@ -739,7 +739,7 @@ static inline void ptep_clear(struct mm_struct *mm, uns= igned long addr, * present bit set *unless* it is 'l'. Because get_user_pages_fast() only * operates on present ptes we're safe. */ -static inline pte_t ptep_get_lockless(pte_t *ptep) +static inline pte_t ptep_get_lockless(const pte_t *ptep) { pte_t pte; =20 @@ -777,7 +777,7 @@ static inline pmd_t pmdp_get_lockless(pmd_t *pmdp) * We require that the PTE can be read atomically. */ #ifndef ptep_get_lockless -static inline pte_t ptep_get_lockless(pte_t *ptep) +static inline pte_t ptep_get_lockless(const pte_t *ptep) { return ptep_get(ptep); } --=20 2.55.0 From nobody Fri Jul 24 21:52:56 2026 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.223.130]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C2B5941F5F9 for ; Fri, 24 Jul 2026 10:20:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=195.135.223.130 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784888440; cv=none; 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Fri, 24 Jul 2026 10:20:24 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id 4CtyNmg8Y2oSaQAAD6G6ig (envelope-from ); Fri, 24 Jul 2026 10:20:24 +0000 From: Pedro Falcato To: Andrew Morton , David Hildenbrand Cc: Pedro Falcato , Catalin Marinas , Will Deacon , "James E.J. Bottomley" , Helge Deller , Madhavan Srinivasan , Michael Ellerman , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , "Matthew Wilcox (Oracle)" , Jan Kara , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Kevin Brodsky , Muhammad Usama Anjum , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Subject: [PATCH 2/5] mm/arm64: constify pte_get*() and contpte get logic Date: Fri, 24 Jul 2026 11:20:14 +0100 Message-ID: <20260724102017.141532-3-pfalcato@suse.de> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260724102017.141532-1-pfalcato@suse.de> References: <20260724102017.141532-1-pfalcato@suse.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Spam-Score: -1.30 X-Spam-Level: X-Spam-Flag: NO X-Spamd-Result: default: False [-1.30 / 50.00]; BAYES_HAM(-3.00)[100.00%]; SUSPICIOUS_RECIPS(1.50)[]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.de:email,suse.de:mid]; RCPT_COUNT_TWELVE(0.00)[33]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; FREEMAIL_CC(0.00)[suse.de,arm.com,kernel.org,HansenPartnership.com,gmx.de,linux.ibm.com,ellerman.id.au,infradead.org,google.com,suse.com,suse.cz,nvidia.com,linux.alibaba.com,redhat.com,linux.dev,lists.infradead.org,vger.kernel.org,lists.ozlabs.org,kvack.org]; RCVD_TLS_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; R_RATELIMIT(0.00)[to_ip_from(RLxu57a9hfgn7tttf5jiwuqe5o)]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FREEMAIL_ENVRCPT(0.00)[gmx.de] Content-Type: text/plain; charset="utf-8" None of the contpte code needs write access to the PTEs. Signed-off-by: Pedro Falcato --- arch/arm64/include/asm/pgtable.h | 10 +++++----- arch/arm64/mm/contpte.c | 4 ++-- 2 files changed, 7 insertions(+), 7 deletions(-) diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgta= ble.h index a2681d755358..043bc0649cee 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -378,7 +378,7 @@ static inline void __set_pte(pte_t *ptep, pte_t pte) __set_pte_complete(pte); } =20 -static inline pte_t __ptep_get(pte_t *ptep) +static inline pte_t __ptep_get(const pte_t *ptep) { return READ_ONCE(*ptep); } @@ -1652,8 +1652,8 @@ extern void __contpte_try_fold(struct mm_struct *mm, = unsigned long addr, pte_t *ptep, pte_t pte); extern void __contpte_try_unfold(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte); -extern pte_t contpte_ptep_get(pte_t *ptep, pte_t orig_pte); -extern pte_t contpte_ptep_get_lockless(pte_t *orig_ptep); +extern pte_t contpte_ptep_get(const pte_t *ptep, pte_t orig_pte); +extern pte_t contpte_ptep_get_lockless(const pte_t *orig_ptep); extern void contpte_set_ptes(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte, unsigned int nr); extern void contpte_clear_full_ptes(struct mm_struct *mm, unsigned long ad= dr, @@ -1732,7 +1732,7 @@ static inline unsigned int pte_batch_hint(pte_t *ptep= , pte_t pte) */ =20 #define ptep_get ptep_get -static inline pte_t ptep_get(pte_t *ptep) +static inline pte_t ptep_get(const pte_t *ptep) { pte_t pte =3D __ptep_get(ptep); =20 @@ -1743,7 +1743,7 @@ static inline pte_t ptep_get(pte_t *ptep) } =20 #define ptep_get_lockless ptep_get_lockless -static inline pte_t ptep_get_lockless(pte_t *ptep) +static inline pte_t ptep_get_lockless(const pte_t *ptep) { pte_t pte =3D __ptep_get(ptep); =20 diff --git a/arch/arm64/mm/contpte.c b/arch/arm64/mm/contpte.c index 2de12656b4d8..3853ecd2cee9 100644 --- a/arch/arm64/mm/contpte.c +++ b/arch/arm64/mm/contpte.c @@ -310,7 +310,7 @@ void __contpte_try_unfold(struct mm_struct *mm, unsigne= d long addr, } EXPORT_SYMBOL_GPL(__contpte_try_unfold); 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Fri, 24 Jul 2026 10:20:27 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id gNvcEms8Y2oSaQAAD6G6ig (envelope-from ); Fri, 24 Jul 2026 10:20:27 +0000 From: Pedro Falcato To: Andrew Morton , David Hildenbrand Cc: Pedro Falcato , Catalin Marinas , Will Deacon , "James E.J. Bottomley" , Helge Deller , Madhavan Srinivasan , Michael Ellerman , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , "Matthew Wilcox (Oracle)" , Jan Kara , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Kevin Brodsky , Muhammad Usama Anjum , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Subject: [PATCH 3/5] mm/parisc: constify ptep_get() argument Date: Fri, 24 Jul 2026 11:20:15 +0100 Message-ID: <20260724102017.141532-4-pfalcato@suse.de> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260724102017.141532-1-pfalcato@suse.de> References: <20260724102017.141532-1-pfalcato@suse.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Spamd-Result: default: False [-1.51 / 50.00]; BAYES_HAM(-3.00)[100.00%]; SUSPICIOUS_RECIPS(1.50)[]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:email,suse.de:mid,suse.de:dkim,imap1.dmz-prg2.suse.org:rdns,imap1.dmz-prg2.suse.org:helo]; FUZZY_RATELIMITED(0.00)[rspamd.com]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; RCPT_COUNT_TWELVE(0.00)[33]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; R_RATELIMIT(0.00)[to_ip_from(RL764437jfm1qe6abtk9nwyx8m)]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; DKIM_TRACE(0.00)[suse.de:+]; FREEMAIL_CC(0.00)[suse.de,arm.com,kernel.org,HansenPartnership.com,gmx.de,linux.ibm.com,ellerman.id.au,infradead.org,google.com,suse.com,suse.cz,nvidia.com,linux.alibaba.com,redhat.com,linux.dev,lists.infradead.org,vger.kernel.org,lists.ozlabs.org,kvack.org]; RCVD_TLS_ALL(0.00)[]; TO_DN_SOME(0.00)[]; FREEMAIL_ENVRCPT(0.00)[gmx.de] X-Spam-Flag: NO X-Spam-Score: -1.51 X-Spam-Level: X-Rspamd-Queue-Id: A46FB7B6BF X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Action: no action Content-Type: text/plain; charset="utf-8" ptep_get() does not need write access to the PTE. Signed-off-by: Pedro Falcato --- arch/parisc/include/asm/pgtable.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/parisc/include/asm/pgtable.h b/arch/parisc/include/asm/pg= table.h index 467b8547ac8b..83f8333ad099 100644 --- a/arch/parisc/include/asm/pgtable.h +++ b/arch/parisc/include/asm/pgtable.h @@ -432,7 +432,7 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte) return pte; } =20 -static inline pte_t ptep_get(pte_t *ptep) +static inline pte_t ptep_get(const pte_t *ptep) { return READ_ONCE(*ptep); } --=20 2.55.0 From nobody Fri Jul 24 21:52:56 2026 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.223.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B505B42123F for ; Fri, 24 Jul 2026 10:20:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=195.135.223.131 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; 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Fri, 24 Jul 2026 10:20:29 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id iM7EKm08Y2oSaQAAD6G6ig (envelope-from ); Fri, 24 Jul 2026 10:20:29 +0000 From: Pedro Falcato To: Andrew Morton , David Hildenbrand Cc: Pedro Falcato , Catalin Marinas , Will Deacon , "James E.J. Bottomley" , Helge Deller , Madhavan Srinivasan , Michael Ellerman , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , "Matthew Wilcox (Oracle)" , Jan Kara , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Kevin Brodsky , Muhammad Usama Anjum , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Subject: [PATCH 4/5] mm/powerpc/8xx: constify ptep_get() argument Date: Fri, 24 Jul 2026 11:20:16 +0100 Message-ID: <20260724102017.141532-5-pfalcato@suse.de> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260724102017.141532-1-pfalcato@suse.de> References: <20260724102017.141532-1-pfalcato@suse.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Spam-Score: -1.30 X-Spam-Level: X-Spam-Flag: NO X-Spamd-Result: default: False [-1.30 / 50.00]; BAYES_HAM(-3.00)[100.00%]; SUSPICIOUS_RECIPS(1.50)[]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:email,suse.de:mid,imap1.dmz-prg2.suse.org:helo]; RCPT_COUNT_TWELVE(0.00)[33]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; FREEMAIL_CC(0.00)[suse.de,arm.com,kernel.org,HansenPartnership.com,gmx.de,linux.ibm.com,ellerman.id.au,infradead.org,google.com,suse.com,suse.cz,nvidia.com,linux.alibaba.com,redhat.com,linux.dev,lists.infradead.org,vger.kernel.org,lists.ozlabs.org,kvack.org]; RCVD_TLS_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; R_RATELIMIT(0.00)[to_ip_from(RLxu57a9hfgn7tttf5jiwuqe5o)]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FREEMAIL_ENVRCPT(0.00)[gmx.de] Content-Type: text/plain; charset="utf-8" There is no need for write access to the PTE. Signed-off-by: Pedro Falcato --- arch/powerpc/include/asm/nohash/32/pte-8xx.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/include/asm/nohash/32/pte-8xx.h b/arch/powerpc/in= clude/asm/nohash/32/pte-8xx.h index e2ea8ba9f8ca..f2bab31040c7 100644 --- a/arch/powerpc/include/asm/nohash/32/pte-8xx.h +++ b/arch/powerpc/include/asm/nohash/32/pte-8xx.h @@ -226,7 +226,7 @@ static inline pte_basic_t pte_update(struct mm_struct *= mm, unsigned long addr, p =20 #ifdef CONFIG_PPC_16K_PAGES #define ptep_get ptep_get -static inline pte_t ptep_get(pte_t *ptep) +static inline pte_t ptep_get(const pte_t *ptep) { pte_basic_t val =3D READ_ONCE(ptep->pte); pte_t pte =3D {val, val, val, val}; --=20 2.55.0 From nobody Fri Jul 24 21:52:56 2026 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.223.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A224542049E for ; 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Fri, 24 Jul 2026 10:20:31 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id gJGlOW88Y2oSaQAAD6G6ig (envelope-from ); Fri, 24 Jul 2026 10:20:31 +0000 From: Pedro Falcato To: Andrew Morton , David Hildenbrand Cc: Pedro Falcato , Catalin Marinas , Will Deacon , "James E.J. Bottomley" , Helge Deller , Madhavan Srinivasan , Michael Ellerman , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , "Matthew Wilcox (Oracle)" , Jan Kara , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Kevin Brodsky , Muhammad Usama Anjum , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Subject: [PATCH 5/5] mm: constify the pte_offset_map_ro_nolock() return value Date: Fri, 24 Jul 2026 11:20:17 +0100 Message-ID: <20260724102017.141532-6-pfalcato@suse.de> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260724102017.141532-1-pfalcato@suse.de> References: <20260724102017.141532-1-pfalcato@suse.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Spamd-Result: default: False [-1.30 / 50.00]; BAYES_HAM(-3.00)[100.00%]; SUSPICIOUS_RECIPS(1.50)[]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.de:mid,suse.de:email]; RCPT_COUNT_TWELVE(0.00)[33]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; FREEMAIL_CC(0.00)[suse.de,arm.com,kernel.org,HansenPartnership.com,gmx.de,linux.ibm.com,ellerman.id.au,infradead.org,google.com,suse.com,suse.cz,nvidia.com,linux.alibaba.com,redhat.com,linux.dev,lists.infradead.org,vger.kernel.org,lists.ozlabs.org,kvack.org]; RCVD_TLS_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; R_RATELIMIT(0.00)[to_ip_from(RLxu57a9hfgn7tttf5jiwuqe5o)]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FREEMAIL_ENVRCPT(0.00)[gmx.de] X-Spam-Flag: NO X-Spam-Score: -1.30 X-Spam-Level: Content-Type: text/plain; charset="utf-8" Constify the pte_t * retval from pte_offset_map_ro_nolock(), for which it is already pledged that accesses must be read-only. With it, convert the three treewide users to use const pte_t *. khugepaged passes the result right down to fault code (do_swap_page()). This leads to a complicated set of conditions that, in order to be correct, must not install anything into *vmf->pte. This is not trivial to work around in fault code, and as such just trivially cast to non-const pte_t* in the meantime. The other users are far more trivial and the conversion is equally trivially simple. Signed-off-by: Pedro Falcato --- arch/powerpc/mm/pgtable.c | 2 +- include/linux/mm.h | 4 ++-- include/linux/pgtable.h | 2 +- mm/filemap.c | 2 +- mm/khugepaged.c | 2 +- mm/pgtable-generic.c | 4 ++-- 6 files changed, 8 insertions(+), 8 deletions(-) diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c index a9be337be3e4..e29db41b6043 100644 --- a/arch/powerpc/mm/pgtable.c +++ b/arch/powerpc/mm/pgtable.c @@ -390,7 +390,7 @@ void assert_pte_locked(struct mm_struct *mm, unsigned l= ong addr) p4d_t *p4d; pud_t *pud; pmd_t *pmd; - pte_t *pte; + const pte_t *pte; spinlock_t *ptl; =20 if (mm =3D=3D &init_mm) diff --git a/include/linux/mm.h b/include/linux/mm.h index 87feaa5a2b78..4b768639d31d 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -3887,8 +3887,8 @@ static inline pte_t *pte_offset_map(pmd_t *pmd, unsig= ned long addr) pte_t *pte_offset_map_lock(struct mm_struct *mm, pmd_t *pmd, unsigned long addr, spinlock_t **ptlp); =20 -pte_t *pte_offset_map_ro_nolock(struct mm_struct *mm, pmd_t *pmd, - unsigned long addr, spinlock_t **ptlp); +const pte_t *pte_offset_map_ro_nolock(struct mm_struct *mm, pmd_t *pmd, + unsigned long addr, spinlock_t **ptlp); pte_t *pte_offset_map_rw_nolock(struct mm_struct *mm, pmd_t *pmd, unsigned long addr, pmd_t *pmdvalp, spinlock_t **ptlp); diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index dc418553e57a..dd51e722c535 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -112,7 +112,7 @@ static inline pte_t *__pte_map(pmd_t *pmd, unsigned lon= g address) { return pte_offset_kernel(pmd, address); } -static inline void pte_unmap(pte_t *pte) +static inline void pte_unmap(const pte_t *pte) { rcu_read_unlock(); } diff --git a/mm/filemap.c b/mm/filemap.c index 1dbb4c6f824e..4f0575f13b3a 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -3484,7 +3484,7 @@ static vm_fault_t filemap_fault_recheck_pte_none(stru= ct vm_fault *vmf) { struct vm_area_struct *vma =3D vmf->vma; vm_fault_t ret =3D 0; - pte_t *ptep; + const pte_t *ptep; =20 /* * We might have COW'ed a pagecache folio and might now have an mlocked diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 27e8f3077e80..b87e23ad094f 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -1169,7 +1169,7 @@ static enum scan_result __collapse_huge_page_swapin(s= truct mm_struct *mm, * Here the ptl is only used to check pte_same() in * do_swap_page(), so readonly version is enough. */ - pte =3D pte_offset_map_ro_nolock(mm, pmd, addr, &ptl); + pte =3D (pte_t *) pte_offset_map_ro_nolock(mm, pmd, addr, &ptl); if (!pte) { mmap_read_unlock(mm); result =3D SCAN_NO_PTE_TABLE; diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c index b91b1a98029c..2cfc6e608ef4 100644 --- a/mm/pgtable-generic.c +++ b/mm/pgtable-generic.c @@ -308,8 +308,8 @@ pte_t *__pte_offset_map(pmd_t *pmd, unsigned long addr,= pmd_t *pmdvalp) return NULL; } =20 -pte_t *pte_offset_map_ro_nolock(struct mm_struct *mm, pmd_t *pmd, - unsigned long addr, spinlock_t **ptlp) +const pte_t *pte_offset_map_ro_nolock(struct mm_struct *mm, pmd_t *pmd, + unsigned long addr, spinlock_t **ptlp) { pmd_t pmdval; pte_t *pte; --=20 2.55.0