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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: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Server: rspam01 X-Stat-Signature: jywdgbrok9ggmnfuf3dmnjexbsshawqb X-Rspamd-Queue-Id: CE8D980004 X-Rspam-User: X-HE-Tag: 1750041025-211445 X-HE-Meta: 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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; static struct codetag_type *alloc_tag_cttype; +#ifdef CONFIG_ARCH_NEEDS_WEAK_PER_CPU DEFINE_PER_CPU(struct alloc_tag_counters, _shared_alloc_tag); EXPORT_SYMBOL(_shared_alloc_tag); +#endif DEFINE_STATIC_KEY_MAYBE(CONFIG_MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT, mem_alloc_profiling_key); -- 2.25.1