From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 82F8F134BD for ; Wed, 3 Sep 2025 00:25:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756859116; cv=none; b=rrLPXEv+IBstXHrTlo3jT8Ts+ss6v+QfDL0Likt8D+NOjKysRwv/uxgooH/NKd1GPAww0QLTMAzfMwpcTP2yiuk4fp8pRLNrYOhH9h34z86frYteCbiLQSLHjFswqxOv8weI01oa/YE2qXbPWCX5wvXAHfz7vOnnSFndv04G2Z0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756859116; c=relaxed/simple; bh=eU35ypNSCg7khCyF3RnmqEo9aJKjxKnL3sxRxVPXYqs=; h=Date:To:From:Subject:Message-Id; b=VMfiMzslytoDr/lmYs5m3AN6sWITUj0Ep1atMJBpJ2LkadY8yqJr7CLWw/IhH90y8pWKk2mWM7m9GfxHJHQ3wRIjy3+kqM3kXzoSyW6z/5nY+rGrhHQWYJJQjKPHK8Rd3/M+Y/Px9ZCp4ycbxqgyVf1Fp5xhSsVkMTKabzOHS0c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=LZpUvWYw; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="LZpUvWYw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 51920C4CEF5; Wed, 3 Sep 2025 00:25:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1756859116; bh=eU35ypNSCg7khCyF3RnmqEo9aJKjxKnL3sxRxVPXYqs=; h=Date:To:From:Subject:From; b=LZpUvWYwCo+fuDGMEtWM0aZoOCIcgETqtCfFstIQiN/+xdZKChss3ZwPnq3fxKgmB xadul4gHYZj03OASDT4UAe6/nGlmJpddduvCdFYMTnnc9W51z8YNA1E1LFjAdUeuxu uz0p1aPCRQvWj7I4EuvrYuW/GkJrc6ih+psYmRbA= Date: Tue, 02 Sep 2025 17:25:15 -0700 To: mm-commits@vger.kernel.org,yuanchu@google.com,willy@infradead.org,weixugc@google.com,vishal.moola@gmail.com,viro@zeniv.linux.org.uk,vbabka@suse.cz,thuth@redhat.com,tglx@linutronix.de,svens@linux.ibm.com,surenb@google.com,shakeel.butt@linux.dev,rppt@kernel.org,rientjes@google.com,peterz@infradead.org,osalvador@suse.de,nysal@linux.ibm.com,mpe@ellerman.id.au,mingo@redhat.com,mhocko@suse.com,luto@kernel.org,lorenzo.stoakes@oracle.com,linux@armlinux.org.uk,liam.howlett@oracle.com,jfalempe@redhat.com,jcmvbkbc@gmail.com,james.bottomley@HansenPartnership.com,jack@suse.cz,hughd@google.com,hpa@zytor.com,hca@linux.ibm.com,gor@linux.ibm.com,gerald.schaefer@linux.ibm.com,deller@gmx.de,david@redhat.com,davem@davemloft.net,chris@zankel.net,broonie@kernel.org,brauner@kernel.org,bp@alien8.de,borntraeger@linux.ibm.com,baolin.wang@linux.alibaba.com,axelrasmussen@google.com,andreas@gaisler.com,agordeev@linux.ibm.com,max.kellermann@ionos.com,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-constify-process_shares_mm-for-improved-const-correctness.patch added to mm-new branch Message-Id: <20250903002516.51920C4CEF5@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm: constify process_shares_mm() for improved const-correctness has been added to the -mm mm-new branch. Its filename is mm-constify-process_shares_mm-for-improved-const-correctness.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-constify-process_shares_mm-for-improved-const-correctness.patch This patch will later appear in the mm-new branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Note, mm-new is a provisional staging ground for work-in-progress patches, and acceptance into mm-new is a notification for others take notice and to finish up reviews. Please do not hesitate to respond to review feedback and post updated versions to replace or incrementally fixup patches in mm-new. Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: Max Kellermann Subject: mm: constify process_shares_mm() for improved const-correctness Date: Mon, 1 Sep 2025 22:50:14 +0200 This function only reads from the pointer arguments. Local (loop) variables are also annotated with `const` to clarify that these will not be written to. Link: https://lkml.kernel.org/r/20250901205021.3573313-6-max.kellermann@ionos.com Signed-off-by: Max Kellermann Reviewed-by: Lorenzo Stoakes Acked-by: David Hildenbrand Acked-by: Vlastimil Babka Acked-by: Mike Rapoport (Microsoft) Cc: Alexander Gordeev Cc: Al Viro Cc: Andreas Larsson Cc: Andy Lutomirski Cc: Axel Rasmussen Cc: Baolin Wang Cc: Borislav Betkov Cc: Christian Borntraeger Cc: Christian Brauner Cc: Christian Zankel Cc: David Rientjes Cc: David S. Miller Cc: Gerald Schaefer Cc: Heiko Carstens Cc: Helge Deller Cc: "H. Peter Anvin" Cc: Hugh Dickins Cc: Ingo Molnar Cc: James Bottomley Cc: Jan Kara Cc: Jocelyn Falempe Cc: Liam Howlett Cc: Mark Brown Cc: Matthew Wilcox (Oracle) Cc: Max Filippov Cc: Michael Ellerman Cc: Michal Hocko Cc: "Nysal Jan K.A" Cc: Oscar Salvador Cc: Peter Zijlstra Cc: Russel King Cc: Shakeel Butt Cc: Suren Baghdasaryan Cc: Sven Schnelle Cc: Thomas Gleinxer Cc: Thomas Huth Cc: Vasily Gorbik Cc: Vishal Moola (Oracle) Cc: Wei Xu Cc: Yuanchu Xie Signed-off-by: Andrew Morton --- include/linux/mm.h | 2 +- mm/oom_kill.c | 6 +++--- 2 files changed, 4 insertions(+), 4 deletions(-) --- a/include/linux/mm.h~mm-constify-process_shares_mm-for-improved-const-correctness +++ a/include/linux/mm.h @@ -3872,7 +3872,7 @@ static inline int in_gate_area(struct mm } #endif /* __HAVE_ARCH_GATE_AREA */ -extern bool process_shares_mm(struct task_struct *p, struct mm_struct *mm); +bool process_shares_mm(const struct task_struct *p, const struct mm_struct *mm); void drop_slab(void); --- a/mm/oom_kill.c~mm-constify-process_shares_mm-for-improved-const-correctness +++ a/mm/oom_kill.c @@ -490,12 +490,12 @@ static bool oom_killer_disabled __read_m * task's threads: if one of those is using this mm then this task was also * using it. */ -bool process_shares_mm(struct task_struct *p, struct mm_struct *mm) +bool process_shares_mm(const struct task_struct *p, const struct mm_struct *mm) { - struct task_struct *t; + const struct task_struct *t; for_each_thread(p, t) { - struct mm_struct *t_mm = READ_ONCE(t->mm); + const struct mm_struct *t_mm = READ_ONCE(t->mm); if (t_mm) return t_mm == mm; } _ Patches currently in -mm which might be from max.kellermann@ionos.com are pagevech-add-const-to-pointer-parameters-of-getter-functions.patch huge_mmh-disallow-is_huge_zero_folionull.patch mm-constify-shmem-related-test-functions-for-improved-const-correctness.patch mm-constify-pagemap-related-test-getter-functions.patch mm-constify-zone-related-test-getter-functions.patch fs-constify-mapping-related-test-functions-for-improved-const-correctness.patch mm-constify-process_shares_mm-for-improved-const-correctness.patch mm-s390-constify-mapping-related-test-getter-functions.patch parisc-constify-mmap_upper_limit-parameter.patch mm-constify-arch_pick_mmap_layout-for-improved-const-correctness.patch mm-constify-ptdesc_pmd_pts_count-and-folio_get_private.patch mm-constify-various-inline-functions-for-improved-const-correctness.patch mm-constify-assert-test-functions-in-mmh.patch mm-constify-highmem-related-functions-for-improved-const-correctness.patch