From patchwork Mon Dec 2 03:05:26 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shuai Xue X-Patchwork-Id: 13889896 Received: from out30-118.freemail.mail.aliyun.com (out30-118.freemail.mail.aliyun.com [115.124.30.118]) (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 70BD42940F; Mon, 2 Dec 2024 03:05:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.118 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733108754; cv=none; b=SY+f9HOZmqX+LjjAbXfPFoaT+1ZY3CjiDWDuMMFcrcHXij54Xh1xped0IwFh8IhxCNJtvA8a14UYG6r9Mp0BhN89fZQiNsxAqYxieK6PvawrvzhFYHJmmYAS5STiwdepmHlQBaPijtenOXAIidiBepHR8BTJMS00RFtu0nI3HCk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733108754; c=relaxed/simple; bh=DW6gCvmMQmdyny5U/dXcII6JwdZJvm8Ki8pJi9A6y5g=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Tt+SjaWD8qGfXcDeaHW6WtlONCJPlL5rIC46w2bXx50myZ0gjZjmnnF300R0uhzkO1TzEYEfCXSzyndoqBBCg5VWL7FYime+IOChkafsXoZCq1C+lSXso+lshBv1ChAc9zGvnnOBn7Z00Kw0DEKpBxhVeL6wMzekQIjlkl2cStw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=xS9gey5y; arc=none smtp.client-ip=115.124.30.118 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="xS9gey5y" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1733108744; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=ItS4BFOg0AeuOHeL7r95uyYQr4QuXPc/Wv3KswiaGW0=; b=xS9gey5y+c5M23bwGx5ECro7l1lZiNAe8B19nCfjRX2za0qsAw/KMkc++fxDqL4k3zwGfGp8XK32S+4ElhM1+PWmY3gxcSQor1nXXQSywNkxBAOuuh9AzOm5ywygBj6T2+p+BHLL3Zxuw9AmKq5osZ8bi3/1inwEoLk16v15LTk= Received: from localhost.localdomain(mailfrom:xueshuai@linux.alibaba.com fp:SMTPD_---0WKbh0Wj_1733108741 cluster:ay36) by smtp.aliyun-inc.com; Mon, 02 Dec 2024 11:05:42 +0800 From: Shuai Xue To: yazen.ghannam@amd.com, mark.rutland@arm.com, catalin.marinas@arm.com, mingo@redhat.com, robin.murphy@arm.com, Jonathan.Cameron@Huawei.com, bp@alien8.de, rafael@kernel.org, linux-arm-kernel@lists.infradead.org, wangkefeng.wang@huawei.com, tanxiaofei@huawei.com, mawupeng1@huawei.com, tony.luck@intel.com, linmiaohe@huawei.com, naoya.horiguchi@nec.com, james.morse@arm.com, tongtiangen@huawei.com, gregkh@linuxfoundation.org, will@kernel.org, jarkko@kernel.org Cc: linux-acpi@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, linux-edac@vger.kernel.org, x86@kernel.org, xueshuai@linux.alibaba.com, justin.he@arm.com, ardb@kernel.org, ying.huang@intel.com, ashish.kalra@amd.com, baolin.wang@linux.alibaba.com, tglx@linutronix.de, dave.hansen@linux.intel.com, lenb@kernel.org, hpa@zytor.com, robert.moore@intel.com, lvying6@huawei.com, xiexiuqi@huawei.com, zhuo.song@linux.alibaba.com Subject: [PATCH v17 2/3] mm: memory-failure: move return value documentation to function declaration Date: Mon, 2 Dec 2024 11:05:26 +0800 Message-ID: <20241202030527.20586-3-xueshuai@linux.alibaba.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20241202030527.20586-1-xueshuai@linux.alibaba.com> References: <20241202030527.20586-1-xueshuai@linux.alibaba.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Part of return value comments for memory_failure() were originally documented at the call site. Move those comments to the function declaration to improve code readability and to provide developers with immediate access to function usage and return information. Signed-off-by: Shuai Xue Reviewed-by: Jarkko Sakkinen Reviewed-by: Jonathan Cameron Reviewed-by: Yazen Ghannam --- arch/x86/kernel/cpu/mce/core.c | 7 ------- mm/memory-failure.c | 10 +++++++--- 2 files changed, 7 insertions(+), 10 deletions(-) diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c index 7fb5556a0b53..d1dd7f892514 100644 --- a/arch/x86/kernel/cpu/mce/core.c +++ b/arch/x86/kernel/cpu/mce/core.c @@ -1398,13 +1398,6 @@ static void kill_me_maybe(struct callback_head *cb) return; } - /* - * -EHWPOISON from memory_failure() means that it already sent SIGBUS - * to the current process with the proper error info, - * -EOPNOTSUPP means hwpoison_filter() filtered the error event, - * - * In both cases, no further processing is required. - */ if (ret == -EHWPOISON || ret == -EOPNOTSUPP) return; diff --git a/mm/memory-failure.c b/mm/memory-failure.c index a7b8ccd29b6f..14c316d7d38d 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -2211,9 +2211,13 @@ static void kill_procs_now(struct page *p, unsigned long pfn, int flags, * Must run in process context (e.g. a work queue) with interrupts * enabled and no spinlocks held. * - * Return: 0 for successfully handled the memory error, - * -EOPNOTSUPP for hwpoison_filter() filtered the error event, - * < 0(except -EOPNOTSUPP) on failure. + * Return: + * 0 - success, + * -ENXIO - memory not managed by the kernel + * -EOPNOTSUPP - hwpoison_filter() filtered the error event, + * -EHWPOISON - the page was already poisoned, potentially + * kill process, + * other negative values - failure. */ int memory_failure(unsigned long pfn, int flags) {