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Sat, 21 Mar 2026 05:08:55 -0700 (PDT) Received: from localhost.localdomain ([113.218.252.54]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2b08366b9aesm66243445ad.58.2026.03.21.05.08.51 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Sat, 21 Mar 2026 05:08:54 -0700 (PDT) From: Chengkaitao To: rppt@kernel.org, akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org, Liam.Howlett@oracle.com, vbabka@kernel.org, surenb@google.com, mhocko@suse.com Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Kaitao Cheng Subject: [PATCH] mm: Mark early-init static variables with __meminitdata Date: Sat, 21 Mar 2026 20:08:47 +0800 Message-ID: <20260321120847.8159-1-pilgrimtao@gmail.com> X-Mailer: git-send-email 2.50.1 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 Content-Type: text/plain; charset="utf-8" From: Kaitao Cheng Static variables defined inside __meminit functions should also be marked with __meminitdata, so that their storage is placed in the .init.data section and reclaimed with free_initmem(), thereby reducing permanent .bss memory usage when CONFIG_MEMORY_HOTPLUG is disabled. Signed-off-by: Kaitao Cheng --- mm/mm_init.c | 2 +- mm/sparse-vmemmap.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/mm_init.c b/mm/mm_init.c index df34797691bd..24420217522f 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -801,7 +801,7 @@ void __meminit reserve_bootmem_region(phys_addr_t start, static bool __meminit overlap_memmap_init(unsigned long zone, unsigned long *pfn) { - static struct memblock_region *r; + static struct memblock_region *r __meminitdata; =20 if (mirrored_kernelcore && zone =3D=3D ZONE_MOVABLE) { if (!r || *pfn >=3D memblock_region_memory_end_pfn(r)) { diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c index 37522d6cb398..ca05941463f4 100644 --- a/mm/sparse-vmemmap.c +++ b/mm/sparse-vmemmap.c @@ -62,7 +62,7 @@ void * __meminit vmemmap_alloc_block(unsigned long size, = int node) if (slab_is_available()) { gfp_t gfp_mask =3D GFP_KERNEL|__GFP_RETRY_MAYFAIL|__GFP_NOWARN; int order =3D get_order(size); - static bool warned; + static bool warned __meminitdata; struct page *page; =20 page =3D alloc_pages_node(node, gfp_mask, order); --=20 2.50.1 (Apple Git-155)