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Wed, 02 Sep 2026 00:59:54 -0700 (PDT) Received: from PC-2B0BA31200898.company.local ([122.11.210.25]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-39ae0f28b19sm4496659a91.6.2026.09.02.00.59.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Sep 2026 00:59:53 -0700 (PDT) From: Meijing Zhao To: Mike Rapoport , Andrew Morton Cc: Meijing Zhao , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Wandun Chen Subject: [PATCH v3] mm: memblock: show all region flags in debugfs Date: Wed, 2 Sep 2026 15:59:44 +0800 Message-Id: <20260902075944.3742866-1-zhaomeijing100@gmail.com> X-Mailer: git-send-email 2.25.1 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: 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 the remaining flags are hidden from debugfs. Walk all bits in the region flags and print every set flag separated by "|". Keep walking beyond flagname[] so that a set flag without a known name is reported as UNKNOWN rather than silently ignored. Fixes: 493f349e38d0 ("memblock: Add flags and nid info in memblock debugfs") Signed-off-by: Meijing Zhao --- Changes in v3: - Rebase onto v7.3-rc1 and send the former patch 2/3 as a standalone patch. - Move flags and first into the reg->flags block. - Remove the redundant flagname[j] NULL check. - Keep the existing NONE output unchanged. - Drop the debugfs synchronization change. As discussed during the v2 review, proper locking for runtime memblock accesses needs a broader design and will be addressed separately. v2: https://lore.kernel.org/linux-mm/20260821020910.3428585-1-zhaomeijing10= 0@gmail.com/ mm/memblock.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-) diff --git a/mm/memblock.c b/mm/memblock.c index 9ce86349a29f..021db49eb7fc 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -2908,14 +2908,18 @@ static int memblock_debug_show(struct seq_file *m, = void *private) else seq_printf(m, "%4c ", 'x'); if (reg->flags) { - for (j =3D 0; j < count; j++) { - if (reg->flags & (1U << j)) { - seq_printf(m, "%s\n", flagname[j]); - break; - } + unsigned int flags =3D reg->flags; + bool first =3D true; + + for (j =3D 0; flags; j++, flags >>=3D 1) { + if (!(flags & 1)) + continue; + if (!first) + seq_putc(m, '|'); + seq_puts(m, j < count ? flagname[j] : "UNKNOWN"); + first =3D false; } - if (j =3D=3D count) - seq_printf(m, "%s\n", "UNKNOWN"); + seq_putc(m, '\n'); } else { seq_printf(m, "%s\n", "NONE"); } --=20 2.25.1