From nobody Fri Oct 10 09:22:48 2025 Received: from out-187.mta1.migadu.com (out-187.mta1.migadu.com [95.215.58.187]) (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 84373296153 for ; Mon, 16 Jun 2025 02:30:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.187 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750041028; cv=none; b=rCfk4xTaQBzy6stDQ3tCCDd4SaHhmHzsrRnlL9V/3hnBJv0U65iIFaxbkFD2p8UksOymN+pug2r2/94qMraCjw2h9qhJsQQppUfl7QmQ4kMuM65zeE30fWYZIznlxwuPPC2Q431+r0fiwZAQ1cViZgu5mUneTd179XSP6BZnaGU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750041028; c=relaxed/simple; bh=K6Lvk3lCdv4M+F3hTNjTrtGNVvzF0n8odBOG6Q3Tp4k=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=BqYd0wmqvbb5Vgr8u2wpi1xhbKRjmIWrOG1idqpq0aqGEjma40piSL6SIH8I+cl1Bl+hSA1Z89A3lygfkvec5jrsZvaS5SE/slRtttcAB8s72m1Ysv+j8yKf+LvXTRE321L8vGqQXPBN4daSGzRdQMZga4JfOQk88SyMc8G9rBQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=ovwn9yIL; arc=none smtp.client-ip=95.215.58.187 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="ovwn9yIL" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1750041024; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=hz18ocd/uSYiTes8KSvGTUaH79rqlEUDMw44khNO0b8=; b=ovwn9yILg7Ld/EV2cpX+yCktmX9NPFhFTkL7UBJuwOWxR6IpOsktL/W+xgQkSTJCcKQh9v JI01sD8DujrTD/KOB2P6oLNChagB8pDmUAfvKDzDcEuKcs4I/XzZozZid4bpFpU+e1NqTQ n2/IvX36dhEGHi81Fn9cIbXZtgGVh0o= From: Hao Ge To: Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Suren Baghdasaryan , Mike Rapoport , Richard Henderson , Matt Turner , Dennis Zhou , Tejun Heo , Christoph Lameter , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Kent Overstreet Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, linux-s390@vger.kernel.org, Hao Ge , Hao Ge Subject: [PATCH v3 2/2] mm/alloc_tag: add the CONFIG_ARCH_NEEDS_WEAK_PER_CPU macro when statically defining the percpu variable _shared_alloc_tag Date: Mon, 16 Jun 2025 10:29:18 +0800 Message-Id: In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset="utf-8" From: Hao Ge Given the introduction of the CONFIG_ARCH_NEEDS_WEAK_PER_CPU macro, we can now conditionally define the perpcu variable _shared_alloc_tag based on its value. This allows architectures(such as s390/alpha) that require weak definitions for percpu variables in modules to include the definition,while others can omit it via compile-time exclusion. Suggested-by: Suren Baghdasaryan Signed-off-by: Hao Ge --- lib/alloc_tag.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/lib/alloc_tag.c b/lib/alloc_tag.c index c7f602fa7b23..14fd66f26e42 100644 --- a/lib/alloc_tag.c +++ b/lib/alloc_tag.c @@ -24,8 +24,10 @@ static bool mem_profiling_support; =20 static struct codetag_type *alloc_tag_cttype; =20 +#ifdef CONFIG_ARCH_NEEDS_WEAK_PER_CPU DEFINE_PER_CPU(struct alloc_tag_counters, _shared_alloc_tag); EXPORT_SYMBOL(_shared_alloc_tag); +#endif =20 DEFINE_STATIC_KEY_MAYBE(CONFIG_MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT, mem_alloc_profiling_key); --=20 2.25.1