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 E72F8230BFF for ; Wed, 9 Jul 2025 22:17:35 +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=1752099457; cv=none; b=K9z37RhdjtjazGUJlXrZiOb8DFGDENL1X3Z1JsYfJpYSd6sxvQmY9/airLjdvDMd9vXgBWpeinPSpfbR0HcFr3+OEar7YhvAQAimEM/58O/e8TbCiIw6KYjWWyLKwO7ZMG/drrVXS47UM1vf4aBMwb/iOOfJRNrsBGcfLIFRUUQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752099457; c=relaxed/simple; bh=gDVhM6dz9Ddtm38m0teS5UcW5VYEs5DD2M4+Q0HD4yo=; h=Date:To:From:Subject:Message-Id; b=KwhL2CIkgLhrit7s7MBNwEeZTnfJJ2Icc3fSNmACOFWuy2+eyJ+uBYfHps4l7dn+H3Xf2wyhLE0Fx7WA4VweooGO/YQaJ4w6e1o8zDHsKmxGtmwa1OfGs63amKREvaIZy5DXXi1A32coWcSS4xGULg2z6WQRhZflzg13kJQbk7A= 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=fcQpjg9A; 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="fcQpjg9A" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2AAD0C4CEEF; Wed, 9 Jul 2025 22:17:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1752099455; bh=gDVhM6dz9Ddtm38m0teS5UcW5VYEs5DD2M4+Q0HD4yo=; h=Date:To:From:Subject:From; b=fcQpjg9AdcBFfj8+T8el4bY/4mj+bY1dCzfZq9m0Sx9QJzFRJu+VCVprNZ07E2JVX TBWCNM3HnoZrtTmCBgOxcHysdzbdjuelz0SKc5i2W4+VlbOo6BvDkLBad/o278L9Vw eoQgJM0TQyDNU9ssONwfBzu8f77CMojGlJWl8RQg= Date: Wed, 09 Jul 2025 15:17:34 -0700 To: mm-commits@vger.kernel.org,willy@infradead.org,linux@jordanrome.com,david@redhat.com,vishal.moola@gmail.com,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-memoryc-use-folios-in-__copy_remote_vm_str.patch added to mm-new branch Message-Id: <20250709221735.2AAD0C4CEEF@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm/memory.c: use folios in __copy_remote_vm_str() has been added to the -mm mm-new branch. Its filename is mm-memoryc-use-folios-in-__copy_remote_vm_str.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-memoryc-use-folios-in-__copy_remote_vm_str.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: "Vishal Moola (Oracle)" Subject: mm/memory.c: use folios in __copy_remote_vm_str() Date: Wed, 9 Jul 2025 12:40:16 -0700 Patch series "Remove unmap_and_put_page()". This patchset uses folios in both the callers of unmap_and_put_page(), saving a couple calls to compound_head() wrappers. This patch (of 3): Use kmap_local_folio() instead of kmap_local_page(). Replaces 2 calls to compound_head() from unmap_and_put_page() with one. This prepares us for the removal of unmap_and_put_page(). Link: https://lkml.kernel.org/r/20250709194017.927978-3-vishal.moola@gmail.com Link: https://lkml.kernel.org/r/20250709194017.927978-4-vishal.moola@gmail.com Signed-off-by: Vishal Moola (Oracle) Cc: David Hildenbrand Cc: Jordan Rome Cc: Matthew Wilcox (Oracle) Signed-off-by: Andrew Morton --- mm/memory.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) --- a/mm/memory.c~mm-memoryc-use-folios-in-__copy_remote_vm_str +++ a/mm/memory.c @@ -6815,6 +6815,7 @@ static int __copy_remote_vm_str(struct m while (len) { int bytes, offset, retval; void *maddr; + struct folio *folio; struct page *page; struct vm_area_struct *vma = NULL; @@ -6830,17 +6831,18 @@ static int __copy_remote_vm_str(struct m goto out; } + folio = page_folio(page); bytes = len; offset = addr & (PAGE_SIZE - 1); if (bytes > PAGE_SIZE - offset) bytes = PAGE_SIZE - offset; - maddr = kmap_local_page(page); + maddr = kmap_local_folio(folio, folio_page_idx(folio, page) * PAGE_SIZE); retval = strscpy(buf, maddr + offset, bytes); if (retval >= 0) { /* Found the end of the string */ buf += retval; - unmap_and_put_page(page, maddr); + folio_release_kmap(folio, maddr); break; } @@ -6858,7 +6860,7 @@ static int __copy_remote_vm_str(struct m } len -= bytes; - unmap_and_put_page(page, maddr); + folio_release_kmap(folio, maddr); } out: _ Patches currently in -mm which might be from vishal.moola@gmail.com are mm-memoryc-use-folios-in-__copy_remote_vm_str.patch mm-memoryc-use-folios-in-__access_remote_vm.patch mm-remove-unmap_and_put_page.patch