From nobody Thu Apr 9 12:48:29 2026 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 C65A03859CC for ; Mon, 9 Mar 2026 11:55:56 +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=1773057356; cv=none; b=KkOR65n/WAwZmqeDIFhYiRhL9UvrboyMjCQu9YdDBE48WUgu+8/HZH1zZ5wAIlulXeZKBNL/ySZHB8OTLWQNHYtijbv3jTIlrq46Jg9AB2v6qcwI4s7DSThQ0wIdDM3xlGhsS1gynlOIQ05GBlqAyv+GVV6OtmMSSMy9aKyDmDc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773057356; c=relaxed/simple; bh=Tkc2G5v7MJj/0+toMiZPKrDMqernsxUrrJDbe2DWPYM=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=jHZnq43f6tD4q10CLiglE7t3KlsdrtrwfV0E0M91Mel535TgKEtfqIFrPjB4opYuAkR6/vI5IR2sSeJQINwQZSOCW8JW3FAh0nMlJdqGfjGKc77uWUxmG/EnzNxwA5RgYqSIpxFT3RsuPDk2HYO+1NYl1eP2On+uK41JabZu9uk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=sRIUkNWG; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="sRIUkNWG" Received: by smtp.kernel.org (Postfix) with ESMTPS id 7D3EBC2BC86; Mon, 9 Mar 2026 11:55:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773057356; bh=Tkc2G5v7MJj/0+toMiZPKrDMqernsxUrrJDbe2DWPYM=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=sRIUkNWGsABFa8kdDDrR33aTDFr/sXXQOoLU63pncZ/FqAQzJYRvhu6qjK5UFcYlJ 6Qenp9K4h9HV3UMFvL/MslPrggOsM6rmK5ucf9Tbm0JEvyevEDG6roA0BqAOHg+Ew9 7uGjcT/OKSi72L3mFMVgTn8hwLjROUAOjA9Z37tUtbVMs4KSenJontUo5flAOWbNcM J3gE3K2YIs+XC73DKFau0KJiw9U79kgy4WyuSVMhfWoUoDtGIYYoCtdgPdtAU/Np0H l1AWbI+vXxyWfXZJD6soigm8fzdKlwNfZDcTzvrVxeEph7FbtKgLl/g2HjLOHIrkdq hv8tT8ljnLHrA== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6FED5EFCD9C; Mon, 9 Mar 2026 11:55:56 +0000 (UTC) From: Shivam Kalra via B4 Relay Date: Mon, 09 Mar 2026 17:25:45 +0530 Subject: [PATCH v3 1/2] mm/vmalloc: extract vmalloc_free_pages() helper from vfree() Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260309-vmalloc-shrink-v3-1-5590fd8de2eb@zohomail.in> References: <20260309-vmalloc-shrink-v3-0-5590fd8de2eb@zohomail.in> In-Reply-To: <20260309-vmalloc-shrink-v3-0-5590fd8de2eb@zohomail.in> To: Andrew Morton , Uladzislau Rezki Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Alice Ryhl , Danilo Krummrich , Shivam Kalra X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1773057354; l=2510; i=shivamkalra98@zohomail.in; s=20260212; h=from:subject:message-id; bh=K+fKY35rqal1HjSu0w8XUZyvTIb7GSRojmpzX5n0cKs=; b=tMvxDF4NmGBn266aUsP+BKfmmmHzs/OZbd58axuJ2Mp3ZLEdgFFSuV5XELVT1XA29RKBD299L /+X1aDNpFovBk90VI4PO/fFT8dyB3TnaE17p1U4Enf3NXpoaaJacXwE X-Developer-Key: i=shivamkalra98@zohomail.in; a=ed25519; pk=9Q+S1LD/xjbjL7bEaLIlwRADBwU/6LJq7lYm8LFrkQE= X-Endpoint-Received: by B4 Relay for shivamkalra98@zohomail.in/20260212 with auth_id=633 X-Original-From: Shivam Kalra Reply-To: shivamkalra98@zohomail.in From: Shivam Kalra Extract the page-freeing loop and NR_VMALLOC stat accounting from vfree() into a reusable vmalloc_free_pages() helper. The helper operates on a range [start, end) of pages from a vm_struct, making it suitable for both full free (vfree) and partial free (upcoming vrealloc shrink). No functional change. Signed-off-by: Shivam Kalra --- mm/vmalloc.c | 46 ++++++++++++++++++++++++++++++++-------------- 1 file changed, 32 insertions(+), 14 deletions(-) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index c607307c657a..42ae68450a90 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -3416,6 +3416,36 @@ void vfree_atomic(const void *addr) schedule_work(&p->wq); } =20 +/* + * vmalloc_free_pages - free a range of pages from a vmalloc allocation + * @vm: the vm_struct containing the pages + * @start: first page index to free (inclusive) + * @end: last page index to free (exclusive) + * + * Free pages [start, end) updating NR_VMALLOC stat accounting. + * Caller is responsible for unmapping (vunmap_range) and KASAN + * poisoning before calling this. + */ +static void vmalloc_free_pages(struct vm_struct *vm, unsigned int start, + unsigned int end) +{ + unsigned int i; + + for (i =3D start; i < end; i++) { + struct page *page =3D vm->pages[i]; + + BUG_ON(!page); + /* + * High-order allocs for huge vmallocs are split, so + * can be freed as an array of order-0 allocations + */ + if (!(vm->flags & VM_MAP_PUT_PAGES)) + mod_lruvec_page_state(page, NR_VMALLOC, -1); + __free_page(page); + cond_resched(); + } +} + /** * vfree - Release memory allocated by vmalloc() * @addr: Memory base address @@ -3436,7 +3466,6 @@ void vfree_atomic(const void *addr) void vfree(const void *addr) { struct vm_struct *vm; - int i; =20 if (unlikely(in_interrupt())) { vfree_atomic(addr); @@ -3459,19 +3488,8 @@ void vfree(const void *addr) =20 if (unlikely(vm->flags & VM_FLUSH_RESET_PERMS)) vm_reset_perms(vm); - for (i =3D 0; i < vm->nr_pages; i++) { - struct page *page =3D vm->pages[i]; - - BUG_ON(!page); - /* - * High-order allocs for huge vmallocs are split, so - * can be freed as an array of order-0 allocations - */ - if (!(vm->flags & VM_MAP_PUT_PAGES)) - mod_lruvec_page_state(page, NR_VMALLOC, -1); - __free_page(page); - cond_resched(); - } + if (vm->nr_pages) + vmalloc_free_pages(vm, 0, vm->nr_pages); kvfree(vm->pages); kfree(vm); } --=20 2.43.0