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Wed, 19 Aug 2026 00:54:31 -0700 (PDT) From: Meijing Zhao To: Mike Rapoport , Andrew Morton Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Wandun Chen , Meijing Zhao Subject: [PATCH 1/2] mm: memblock: add missing HugeTLB flag name Date: Wed, 19 Aug 2026 15:54:21 +0800 Message-Id: <20260819075422.2387980-2-zhaomeijing100@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260819075422.2387980-1-zhaomeijing100@gmail.com> References: <20260819075422.2387980-1-zhaomeijing100@gmail.com> 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: Meijing Zhao Commit 7d163a75f821 ("memblock: make HugeTLB bootmem allocation work with KHO") added MEMBLOCK_RSRV_HUGETLB but did not add the corresponding entry to flagname[]. As a result, memblock debugfs cannot report the flag by name. Add the missing RSV_HUGETLB entry. Fixes: 7d163a75f821 ("memblock: make HugeTLB bootmem allocation work with K= HO") Signed-off-by: Meijing Zhao --- mm/memblock.c | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/memblock.c b/mm/memblock.c index 9ce86349a29f..f2952d725c10 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -2886,6 +2886,7 @@ static const char * const flagname[] =3D { [ilog2(MEMBLOCK_RSRV_NOINIT)] =3D "RSV_NIT", [ilog2(MEMBLOCK_RSRV_KERN)] =3D "RSV_KERN", [ilog2(MEMBLOCK_KHO_SCRATCH)] =3D "KHO_SCRATCH", + [ilog2(MEMBLOCK_RSRV_HUGETLB)] =3D "RSV_HUGETLB", }; =20 static int memblock_debug_show(struct seq_file *m, void *private) --=20 2.25.1 From nobody Mon Sep 28 17:49:00 2026 Received: from mail-pj1-f44.google.com (mail-pj1-f44.google.com [209.85.216.44]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 71EFD3F4DD6 for ; Wed, 19 Aug 2026 07:54:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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Wed, 19 Aug 2026 00:54:35 -0700 (PDT) Received: from PC-2B0BA31200898.company.local ([122.11.210.25]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3957faf596fsm1668929a91.11.2026.08.19.00.54.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 19 Aug 2026 00:54:35 -0700 (PDT) From: Meijing Zhao To: Mike Rapoport , Andrew Morton Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Wandun Chen , Meijing Zhao Subject: [PATCH 2/2] mm: memblock: show all region flags in debugfs Date: Wed, 19 Aug 2026 15:54:22 +0800 Message-Id: <20260819075422.2387980-3-zhaomeijing100@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260819075422.2387980-1-zhaomeijing100@gmail.com> References: <20260819075422.2387980-1-zhaomeijing100@gmail.com> 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: Meijing Zhao Commit 493f349e38d0 ("memblock: Add flags and nid info in memblock debugfs") made memblock_debug_show() stop after finding the first set flag. A memblock region can carry multiple flags, so debugfs hides all but the lowest set bit. In particular, memory allocated for HugeTLB pages is reserved with both MEMBLOCK_RSRV_KERN and MEMBLOCK_RSRV_HUGETLB, but debugfs only reports RSV_KERN. Print every set flag separated by '|'. A HugeTLB reservation is now shown as: RSV_KERN|RSV_HUGETLB instead of: RSV_KERN Fixes: 493f349e38d0 ("memblock: Add flags and nid info in memblock debugfs") Signed-off-by: Meijing Zhao --- mm/memblock.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) diff --git a/mm/memblock.c b/mm/memblock.c index f2952d725c10..5d806fe92cd7 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -2896,6 +2896,7 @@ static int memblock_debug_show(struct seq_file *m, vo= id *private) int i, j, nid; unsigned int count =3D ARRAY_SIZE(flagname); phys_addr_t end; + bool first; =20 for (i =3D 0; i < type->cnt; i++) { reg =3D &type->regions[i]; @@ -2909,14 +2910,18 @@ static int memblock_debug_show(struct seq_file *m, = void *private) else seq_printf(m, "%4c ", 'x'); if (reg->flags) { + first =3D true; for (j =3D 0; j < count; j++) { - if (reg->flags & (1U << j)) { - seq_printf(m, "%s\n", flagname[j]); - break; - } + if (!(reg->flags & (1U << j))) + continue; + if (!first) + seq_putc(m, '|'); + seq_puts(m, flagname[j] ?: "UNKNOWN"); + first =3D false; } - if (j =3D=3D count) - seq_printf(m, "%s\n", "UNKNOWN"); + if (first) + seq_puts(m, "UNKNOWN"); + seq_putc(m, '\n'); } else { seq_printf(m, "%s\n", "NONE"); } --=20 2.25.1