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 8DC454FB9C1 for ; Thu, 3 Sep 2026 20:44:59 +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=1788468311; cv=none; b=nAZD+Z6qYLwU/W5M61VV7ZI/CW0ptRA2tnXL2Cs3ARVjcAEt14SlofdOCtentvnvwyS2kW9M7NDBZO/3fXdgM/oA1rQRn95v6b8Yf+uQoaVi/9wQFPdoOvqZalPiD7K9YkBaANxXVn/ZwQHh+QzYavKLGWzmVVjiOrVHdwIk9tY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788468311; c=relaxed/simple; bh=F8HEMKpJybEw1lTKZMcjtIHiEgt7ggxJ6as34glhZMM=; h=Date:To:From:Subject:Message-Id; b=W8kmBi4uFQwRY++qqMmWmM3Oyin8R92R2AzqS9dNEHhYS+Z7Mv+54WiyQ60n9B3NlPXJ4pV9pY0rTpvI639hrf1NWxJksA/UKE1DnC6EQLoOt/L1/hkgoM+VuPNdKn47Egfh2aDw6aBkwDMGW6DnPMdJEPBAAfL4MbmzyihGl+8= 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=k1hHRMrU; 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="k1hHRMrU" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4AA0F1F00A3D; Thu, 3 Sep 2026 20:44:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1788468297; bh=rwbObD8dv74Ncge2VvElERqCBn+YzaB7UHPaY9ELwcs=; h=Date:To:From:Subject; b=k1hHRMrUaMAZq1N1X3X7QbNuVY+NKVLvnwUMRjv955KvoLdBxrWfgvR5hEJ79M57p +ixyU5SgYhq6V1e24JEaGMwHGcmKQ8jBPz7B6Ydd/PP0ZeQjOuHSexMtGAyXf7UJ2n c7CpAvWz9BAXyK17M4NzE2JbPa9d4bYq2rJlwjtE= Date: Thu, 03 Sep 2026 13:44:56 -0700 To: mm-commits@vger.kernel.org,sj@kernel.org,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-damon-core-set-ctx-call_controls_obsolete-in-damon_new_ctx.patch added to mm-new branch Message-Id: <20260903204457.4AA0F1F00A3D@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm/damon/core: set ctx->call_controls_obsolete in damon_new_ctx() has been added to the -mm mm-new branch. Its filename is mm-damon-core-set-ctx-call_controls_obsolete-in-damon_new_ctx.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-core-set-ctx-call_controls_obsolete-in-damon_new_ctx.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. The mm-new branch of mm.git is not included in linux-next If a few days of testing in mm-new is successful, the patch will me moved into mm.git's mm-unstable branch, which is included in linux-next 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: SJ Park Subject: mm/damon/core: set ctx->call_controls_obsolete in damon_new_ctx() Date: Wed, 2 Sep 2026 18:03:31 -0700 damon_ctx->call_controls_obsolete is used to disallow damon_call() requests when the request cannot be served. The field is unset and set when the context execution is started and terminated, respectively. The intention is to allow damon_call() requests only while the context is actively being executed. damon_ctx constructor, damon_new_ctx() unsets the field, though. As a result, passing the damon_ctx parameter that never successfully damon_start()-ed to damon_call() can indefinitely hang. The callers should ensure to avoid the case. Such parameter validation is not always simple. Actually such bugs in DAMON_RECLAIM and DAMON_LRU_SORT have been found and fixed [1]. Set the field in damon_new_ctx(), so that DAMON API callers can pass the context parameter to damon_call() without the additional check. Link: https://lore.kernel.org/20260903010334.93622-3-sj@kernel.org Link: https://lore.kernel.org/20260803134646.16640-1-sj@kernel.org [1] Signed-off-by: SJ Park Signed-off-by: Andrew Morton --- mm/damon/core.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) --- a/mm/damon/core.c~mm-damon-core-set-ctx-call_controls_obsolete-in-damon_new_ctx +++ a/mm/damon/core.c @@ -933,6 +933,7 @@ struct damon_ctx *damon_new_ctx(void) INIT_LIST_HEAD(&ctx->adaptive_targets); INIT_LIST_HEAD(&ctx->schemes); + ctx->call_controls_obsolete = true; prandom_seed_state(&ctx->rnd_state, get_random_u64()); return ctx; @@ -2206,10 +2207,6 @@ int damon_kdamond_pid(struct damon_ctx * * synchronization. The return value of the function will be saved in * &damon_call_control->return_code. * - * Note that this function should be called only after damon_start() with the - * @ctx has succeeded. Otherwise, this function could fall into an indefinite - * wait. - * * When this function is failed, the @ctx is guaranteed to be stopped. * * Return: 0 on success, negative error code otherwise. _ Patches currently in -mm which might be from sj@kernel.org are mm-damon-core-skip-applying-scheme-if-region-split-for-quota-fails.patch mm-damon-paddr-respect-folio-end-for-damos_stat.patch mm-damon-paddr-respect-folio-end-for-damos-actions-except-stat.patch mm-damon-vaddr-respect-folio-end-for-damos_stat.patch mm-damon-vaddr-respect-folio-end-for-damos_migrate_hotcold.patch mm-damon-core-handle-extreme-memory-state-in-damon_get_node_mem_bp.patch mm-damon-core-handle-extreme-memory-state-in-get_node_memcg_used_bp.patch mm-damon-core-handle-extreme-memory-state-in-get_in_active_mem_bp.patch mm-damon-core-introduce-damon_filter_type_pgidle_unset.patch mm-damon-paddr-support-pgidle_unset-probe-filter-type.patch mm-damon-sysfs-support-pgidle_unset-probe-filter-type.patch docs-mm-damon-design-document-pgidle_unset-probe-filter-type.patch mm-damon-core-introduce-damon_prep-struct.patch mm-damon-core-commit-preps.patch mm-damon-core-introduce-damon_operations-prep_probes.patch mm-damon-paddr-support-damon_prep.patch mm-damon-sysfs-implement-preps-directory.patch mm-damon-sysfs-implement-preps-nr_preps-file.patch mm-damon-sysfs-create-directories-for-nr_preps-writes.patch mm-damon-sysfs-implement-prep_action-file.patch mm-damon-sysfs-pass-preps-to-damon-core.patch selftests-damon-sysfssh-test-probe-prep-sysfs-files.patch docs-mm-damon-design-document-probe-preps.patch docs-admin-guide-mm-damon-usage-document-probe-preps-sysfs-files.patch docs-abi-damon-document-probe-prep-sysfs-files.patch mm-damon-tests-core-kunit-test-committing-psi-goal-to-psi-goal.patch mm-damon-core-handle-uninitialized-damos_quota_goal-last_psi_total.patch mm-damon-core-copy-nid-for-eligible_mem_bp-damos-quota-goal-commit.patch mm-damon-sysfs-set-next-refresh-jiffies-per-sysfs-context.patch mm-damon-tests-core-kunit-test-damon_commit_filter.patch mm-damon-tests-core-kunit-add-damon_commit_probes-test.patch selftests-damon-_damon_sysfs-implement-damonprobes.patch selftests-damon-drgn_dump_damon_status-dump-probes.patch selftests-damon-sysfspy-extend-commit-assertion-function-for-probes.patch selftests-damon-sysfspy-test-damon-probes.patch mm-damon-core-use-damon_nr_samples_per_aggr-for-max-merge-threshold.patch mm-damon-core-remove-debug-messages.patch mm-damon-core-remove-debug-messages-fix.patch mm-damon-vaddr-remove-a-debug-message.patch mm-damon-core-validate-number-of-probes-in-valid_probe_params.patch mm-damon-sysfs-remove-probes-number-validation.patch mm-damon-tests-core-kunit-extend-set_regions-test-for-error-case.patch mm-damon-tests-core-kunit-test-=0-size-damon_set_regions-inputs.patch mm-damon-tests-core-kunit-test-overlapping-ranges-for-set_regions.patch mm-damon-tests-core-kunit-test-damon_nr_samples_per_aggr.patch selftests-damon-sysfssh-test-hugepage_mem_bp-quota-goal.patch docs-mm-damon-maintainer-profile-update-ai-review-for-sashiko-replies.patch docs-abi-damon-recommend-subsystem-doc-instead-of-admin-guide.patch mm-damon-core-error-damos_commit_quota_goal-for-zero-target_value.patch revert-mm-damon-lru_sort-error-out-for-10000-active_mem_bp.patch revert-samples-damon-mtier-error-out-for-zero-quota-goal-target-values.patch mm-damon-core-handle-null-ctx-parameter-in-damon_call.patch mm-damon-core-set-ctx-call_controls_obsolete-in-damon_new_ctx.patch mm-damon-reclaim-remove-unnecessary-damon_call-param-validation.patch mm-damon-lru_sort-remove-unnecessary-damon_call-param-validation.patch