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 46B8532B10F for ; Wed, 7 Oct 2026 00:53:06 +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=1791334387; cv=none; b=VTzUQbSrV846bIgdXiHz4SW4lhbAdavV5yld2cPOH+coOW55TIyjmY41AZ0uIJJs6xHtZ9mZuG1pmtGrBl1UMtV1JL5ZFWMnjBEJanMVCn/xlqCdpOqsAWlh+evxVBU50XPEp8aU1OhfqwkYdbfuzaMnhwzjZFdvOA1mmnKJDSk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791334387; c=relaxed/simple; bh=de6hGLVD28/lLnXlIKTxPNdC3MZo1/5FFksT169Ci0E=; h=Date:To:From:Subject:Message-Id; b=qm2EinJseS9DNgYgTWJQwQ7BBqwZxRV+AB9gnSzpE/sPzJNrDhLtpaFS12N7eidfO2eQxk5mY57JHaO2nG+9kceYeM3vhq4flST5URa397eYwmdier+g4SfAhmyNtkGWl9UTGIz7Nzudus6WHYImzkrLCFVXESBhANTuyJKhL28= 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=L4Y12DV8; 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="L4Y12DV8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D3D4B1F0089C; Wed, 7 Oct 2026 00:53:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1791334385; bh=hz6ocT/bcQuUD50yi1zMCxjIHJSfzwmCcfK8ILhDr3A=; h=Date:To:From:Subject; b=L4Y12DV8NRTByISqJXaePuXXdrS6onM2xyw/jDOPMuTD5/jYD3Ga1Haf6otkRc0iU QPz4zZKolXthgJYsCOA3JH6P0q2pZBpnYFfBsMvdBB0gBbqRUfQeriWLhSXb7j380l lmYVR4objKuD8S5o36OBX92YHf9aUijnnDm1+7l8= Date: Tue, 06 Oct 2026 17:53:05 -0700 To: mm-commits@vger.kernel.org,ziy@nvidia.com,vbabka@kernel.org,surenb@google.com,shakeel.butt@linux.dev,mhocko@suse.com,ljs@kernel.org,hch@lst.de,hannes@cmpxchg.org,djwong@kernel.org,david@kernel.org,cem@kernel.org,brendan.jackman@linux.dev,brauner@kernel.org,wangkefeng.wang@huawei.com,akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-stable] mm-replace-pf_kcompactd-flag-with-kthread_func-check.patch removed from -mm tree Message-Id: <20261007005305.D3D4B1F0089C@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: mm: replace PF_KCOMPACTD flag with kthread_func() check has been removed from the -mm tree. Its filename was mm-replace-pf_kcompactd-flag-with-kthread_func-check.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: Kefeng Wang Subject: mm: replace PF_KCOMPACTD flag with kthread_func() check Date: Wed, 2 Sep 2026 21:16:53 +0800 PF_KCOMPACTD was introduced by commit ce6d9c1c2b5c ("NFS: fix nfs_release_folio() to not deadlock via kcompactd writeback") so nfs_release_folio() could detect kcompactd context and skip writeback. The flag is only consumed by current_is_kcompactd(), whose sole caller is nfs_release_folio(). Replace the flag-based check with kthread_func(current) == kcompactd, freeing the 0x00010000 PF flag bit. Link: https://lore.kernel.org/20260902131653.1338227-5-wangkefeng.wang@huawei.com Signed-off-by: Kefeng Wang Signed-off-by: Andrew Morton Acked-by: Shakeel Butt Acked-by: Zi Yan Acked-by: Vlastimil Babka (SUSE) Reviewed-by: David Hildenbrand (Arm) Cc: Brendan Jackman Cc: Carlos Maiolino Cc: Christian Brauner Cc: Christoph Hellwig Cc: "Darrick J. Wong" Cc: Johannes Weiner Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Suren Baghdasaryan --- include/linux/compaction.h | 11 ++++++----- include/linux/sched.h | 2 +- mm/compaction.c | 9 ++++++--- tools/sched_ext/include/scx/common.bpf.h | 1 - 4 files changed, 13 insertions(+), 10 deletions(-) --- a/include/linux/compaction.h~mm-replace-pf_kcompactd-flag-with-kthread_func-check +++ a/include/linux/compaction.h @@ -81,10 +81,6 @@ static inline unsigned long compact_gap( return min(2UL << order, COMPACT_CLUSTER_MAX); } -static inline int current_is_kcompactd(void) -{ - return current->flags & PF_KCOMPACTD; -} #ifdef CONFIG_COMPACTION @@ -103,7 +99,7 @@ extern void compaction_defer_reset(struc bool compaction_zonelist_suitable(struct alloc_context *ac, int order, int alloc_flags, gfp_t gfp_mask); - +bool current_is_kcompactd(void); extern void __meminit kcompactd_run(int nid); extern void __meminit kcompactd_stop(int nid); extern void wakeup_kcompactd(pg_data_t *pgdat, int order, int highest_zoneidx); @@ -119,6 +115,11 @@ static inline bool compaction_suitable(s { return false; } + +static inline bool current_is_kcompactd(void) +{ + return false; +} static inline void kcompactd_run(int nid) { --- a/include/linux/sched.h~mm-replace-pf_kcompactd-flag-with-kthread_func-check +++ a/include/linux/sched.h @@ -1809,7 +1809,7 @@ extern struct pid __rcu *cad_pid; #define PF_USED_MATH 0x00002000 /* If unset the fpu must be initialized before use */ #define PF_USER_WORKER 0x00004000 /* Kernel thread cloned from userspace thread */ #define PF_NOFREEZE 0x00008000 /* This thread should not be frozen */ -#define PF_KCOMPACTD 0x00010000 /* I am kcompactd */ +#define PF__HOLE__00010000 0x00010000 #define PF__HOLE__00020000 0x00020000 #define PF_MEMALLOC_NOFS 0x00040000 /* All allocations inherit GFP_NOFS. See memalloc_nfs_save() */ #define PF_MEMALLOC_NOIO 0x00080000 /* All allocations inherit GFP_NOIO. See memalloc_noio_save() */ --- a/mm/compaction.c~mm-replace-pf_kcompactd-flag-with-kthread_func-check +++ a/mm/compaction.c @@ -3197,7 +3197,6 @@ static int kcompactd(void *p) long default_timeout = msecs_to_jiffies(HPAGE_FRAG_CHECK_INTERVAL_MSEC); long timeout = default_timeout; - current->flags |= PF_KCOMPACTD; set_freezable(); pgdat->kcompactd_max_order = 0; @@ -3254,11 +3253,15 @@ static int kcompactd(void *p) pgdat->proactive_compact_trigger = false; } - current->flags &= ~PF_KCOMPACTD; - return 0; } +bool current_is_kcompactd(void) +{ + return kthread_func(current) == kcompactd; +} +EXPORT_SYMBOL_GPL(current_is_kcompactd); + /* * This kcompactd start function will be called by init and node-hot-add. * On node-hot-add, kcompactd will moved to proper cpus if cpus are hot-added. --- a/tools/sched_ext/include/scx/common.bpf.h~mm-replace-pf_kcompactd-flag-with-kthread_func-check +++ a/tools/sched_ext/include/scx/common.bpf.h @@ -31,7 +31,6 @@ #define PF_IDLE 0x00000002 /* I am an IDLE thread */ #define PF_IO_WORKER 0x00000010 /* Task is an IO worker */ #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */ -#define PF_KCOMPACTD 0x00010000 /* I am kcompactd */ #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ #define PF_EXITING 0x00000004 #define CLOCK_MONOTONIC 1 _ Patches currently in -mm which might be from wangkefeng.wang@huawei.com are mm-zswap-convert-zswap_invalidate-to-take-a-range.patch mm-zswap-skip-xarray-walk-in-zswap_invalidate-when-zswap-is-unused.patch mm-zswap-reuse-zswap_invalidate-in-zswap_store.patch mm-mincore-use-per-vma-lock-during-page-table-walk.patch