From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 540521FBEA8 for ; Thu, 25 Jun 2026 00:20:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782346836; cv=none; b=ataIdAal6r4jfIKjbhEedi9+TjsFiS3dUoVq0Pq2BgHqOGXKrBC4OVRfuf2Hv72Tp8aaRzcdLggRHSI7mOaA5Xeef7bPi2TPjEBYFPy0fm35daNKeY5cPMM0kgqQYXAROdEZDnEYA3xevu+r5esIjeAItsTsdkwV042awOk2PlY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782346836; c=relaxed/simple; bh=voXOdJ8eg5z23zkc95TiQfZKswALt9UU25+DPJE/XUY=; h=Date:To:From:Subject:Message-Id; b=WoSM+iCX05V43KtDy3ax8M3inmZrldjF+lPW36Iv2mEIn0jGCUFFsbkVA7keUJZU0aZbaxZMmlPJX2k5fHfYXseoavUMNabIyOehxAwZQ0zrtTXPWsc8opsG0xATEFV2z9nYNS1hUh+RY6qC3u0hziCSfIrY0AoDSfB6sZRwkJk= 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=uxCIFJ+I; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="uxCIFJ+I" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 20B451F000E9; Thu, 25 Jun 2026 00:20:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1782346835; bh=cy0kjfHZ2L/EAc3mZuM2WBGADpwd/WH8l8Yb3jUrNiY=; h=Date:To:From:Subject; b=uxCIFJ+I0FnN2JXdytDncrcWB4Xti6pE3irHpucau1uEIP3zHpGYYFrZz4D41PwOz G+00IzflXEHBr/qQDDAF0Jf18NEKYJC+T0O2qERvWMcy8HgCvV59K6lbbiav8pn3Q3 boX/MZXeV5gRtji4/i7bfGmh6yB75gDJ23Pg/TRU= Date: Wed, 24 Jun 2026 17:20:34 -0700 To: mm-commits@vger.kernel.org,ziy@nvidia.com,vbabka@kernel.org,surenb@google.com,mhocko@suse.com,jackmanb@google.com,hannes@cmpxchg.org,ye.liu@linux.dev,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-page_owner-use-migrate_reason_none-instead-of-1-for-last_migrate_reason.patch added to mm-hotfixes-unstable branch Message-Id: <20260625002035.20B451F000E9@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm/page_owner: use MIGRATE_REASON_NONE instead of -1 for last_migrate_reason has been added to the -mm mm-hotfixes-unstable branch. Its filename is mm-page_owner-use-migrate_reason_none-instead-of-1-for-last_migrate_reason.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-page_owner-use-migrate_reason_none-instead-of-1-for-last_migrate_reason.patch This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm 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 various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: Ye Liu Subject: mm/page_owner: use MIGRATE_REASON_NONE instead of -1 for last_migrate_reason Date: Tue, 23 Jun 2026 14:52:27 +0800 The last_migrate_reason field uses -1 as a sentinel value to mean "no migration has happened". Replace the four bare -1 occurrences with a local MIGRATE_REASON_NONE define so the intent is explicit and the magic number is eliminated. No functional change. Link: https://lore.kernel.org/20260623065234.31866-3-ye.liu@linux.dev Signed-off-by: Ye Liu Cc: Brendan Jackman Cc: Johannes Weiner Cc: Michal Hocko Cc: Suren Baghdasaryan Cc: Vlastimil Babka Cc: Zi Yan Signed-off-by: Andrew Morton --- mm/page_owner.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) --- a/mm/page_owner.c~mm-page_owner-use-migrate_reason_none-instead-of-1-for-last_migrate_reason +++ a/mm/page_owner.c @@ -21,6 +21,13 @@ */ #define PAGE_OWNER_STACK_DEPTH (16) +/* + * Used to indicate that a page has never been migrated, as the valid + * migrate_reason values are non-negative enum members (MR_* in + * include/linux/migrate_mode.h). + */ +#define MIGRATE_REASON_NONE (-1) + struct page_owner { unsigned short order; short last_migrate_reason; @@ -339,7 +346,7 @@ noinline void __set_page_owner(struct pa depot_stack_handle_t handle; handle = save_stack(gfp_mask); - __update_page_owner_handle(page, handle, order, gfp_mask, -1, + __update_page_owner_handle(page, handle, order, gfp_mask, MIGRATE_REASON_NONE, ts_nsec, current->pid, current->tgid, current->comm); inc_stack_record_count(handle, gfp_mask, 1 << order); @@ -596,7 +603,7 @@ print_page_owner(char __user *buf, size_ if (ret >= count) goto err; - if (page_owner->last_migrate_reason != -1) { + if (page_owner->last_migrate_reason != MIGRATE_REASON_NONE) { ret += scnprintf(kbuf + ret, count - ret, "Page has been migrated, last migrate reason: %s\n", migrate_reason_names[page_owner->last_migrate_reason]); @@ -667,7 +674,7 @@ void __dump_page_owner(const struct page stack_depot_print(handle); } - if (page_owner->last_migrate_reason != -1) + if (page_owner->last_migrate_reason != MIGRATE_REASON_NONE) pr_alert("page has been migrated, last migrate reason: %s\n", migrate_reason_names[page_owner->last_migrate_reason]); page_ext_put(page_ext); @@ -826,7 +833,7 @@ static void init_pages_in_zone(struct zo /* Found early allocated page */ __update_page_owner_handle(page, early_handle, 0, 0, - -1, local_clock(), current->pid, + MIGRATE_REASON_NONE, local_clock(), current->pid, current->tgid, current->comm); count++; ext_put_continue: _ Patches currently in -mm which might be from ye.liu@linux.dev are mm-page_owner-extract-skip_buddy_pages-helper-to-unify-buddy-page-skipping.patch mm-page_owner-use-migrate_reason_none-instead-of-1-for-last_migrate_reason.patch mm-page_owner-hoist-config_memcg-to-function-level-for-print_page_owner_memcg.patch mm-page_owner-add-missing-newline-to-count_threshold-format-string.patch mm-page_owner-move-free_ts_nsec-output-to-free-section-in-__dump_page_owner.patch mm-page_owner-drop-redundant-page_owner-prefix-from-static-symbols.patch