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 6739E2BEC5F; Mon, 6 Jul 2026 14:06:39 +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=1783346801; cv=none; b=J0xLcD7LpMYJgLjeGbCsdpPPazmBjEw191AEOwI+B5LDHcqdsp/RqoKitTvD33q7XJLpfyLGEgXXaspR/KkfsRTylEPc8wEFOygHHZDT0VuD88rc+ZawMYLbEIpfKoDydrz+2PbSZoSd9mfSxmd4FTR5NVRJcOr1RD33McUwXoo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783346801; c=relaxed/simple; bh=7MyDB54GgGpdj+548nBYq+PEwE+ZWGPggaI0TD+l2Jc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=mdd0OOuKJMZCrjV8mW2diiI4GR0uknYrUgbOIPjFhm6X7lFwlTL3ERHLNlEDzsiyILfcIju+bgar2yNjP6YdHznNTkL22hfCth3H1o8p92C4LTdBHDpamwy/WweDy8lFu1kxEEdiMYsO4WNYohzybcAZR7LzwHefH/LUKMW6Pds= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=fz1H3HQh; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="fz1H3HQh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CBF4C1F00A3D; Mon, 6 Jul 2026 14:06:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783346799; bh=r0kxycSRSEvbxy9pEgGpchLNtgv4/AHk+YSOYT0eb7k=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=fz1H3HQh41ydM7hKyfjO1GXX+uKXdfQN2MNoCHhwxMU9GXYjTFwt7jL1Xn6FCrXi7 frNYTuzBC1Dy9pxuI79H92f4yBdSUzhM3QCNHpB5Sk/ZsO2mM8bbkQflO4AaUOMBmi SKHFL4ib+Bp5R58zMqb2UMQ5qyORWolnSn+m2a0B10nTHqf4TTAX9eSqGy0Zoe5q6q 44444yDwo/I5+JKR4Y7ea5niffZ7XrPqgl5d0qL4Sfb2kzb1htXFD72mqHL1xMuVAy 4ubJjqmF01wlADyLN5Ol12f5gHQPlOiwHELMplVtOyYZHHTWMJKbzeoM5ddOabOofy 9iNI4Zf64A42Q== From: SJ Park To: Andrew Morton Cc: SJ Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 03/11] mm/damon/core: make damon_stop() never fails Date: Mon, 6 Jul 2026 07:06:18 -0700 Message-ID: <20260706140628.87414-4-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260706140628.87414-1-sj@kernel.org> References: <20260706140628.87414-1-sj@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit damon_stop() has no reason to fail. It returns an error code only for possible future changes that can make it fail. Such a change has not been made yet, and this only makes the error handling complicated and confusing. Ensure it returns no error. Signed-off-by: SJ Park --- mm/damon/core.c | 21 ++++++--------------- 1 file changed, 6 insertions(+), 15 deletions(-) diff --git a/mm/damon/core.c b/mm/damon/core.c index d89a7f2faf350..84e400aa4e823 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -1926,10 +1926,8 @@ int damon_start(struct damon_ctx **ctxs, int nr_ctxs, bool exclusive) /* * __damon_stop() - Stops monitoring of a given context. * @ctx: monitoring context - * - * Return: 0 on success, negative error code otherwise. */ -static int __damon_stop(struct damon_ctx *ctx) +static void __damon_stop(struct damon_ctx *ctx) { struct task_struct *tsk; @@ -1939,31 +1937,24 @@ static int __damon_stop(struct damon_ctx *ctx) get_task_struct(tsk); mutex_unlock(&ctx->kdamond_lock); kthread_stop_put(tsk); - return 0; + return; } mutex_unlock(&ctx->kdamond_lock); - - return -EPERM; } /** * damon_stop() - Stops the monitorings for a given group of contexts. * @ctxs: an array of the pointers for contexts to stop monitoring * @nr_ctxs: size of @ctxs - * - * Return: 0 on success, negative error code otherwise. */ int damon_stop(struct damon_ctx **ctxs, int nr_ctxs) { - int i, err = 0; + int i; - for (i = 0; i < nr_ctxs; i++) { + for (i = 0; i < nr_ctxs; i++) /* nr_running_ctxs is decremented in kdamond_fn */ - err = __damon_stop(ctxs[i]); - if (err) - break; - } - return err; + __damon_stop(ctxs[i]); + return 0; } /** -- 2.47.3