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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: 8bit 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, void *private) int i, j, nid; unsigned int count = ARRAY_SIZE(flagname); phys_addr_t end; + bool first; for (i = 0; i < type->cnt; i++) { reg = &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 = true; for (j = 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 = false; } - if (j == count) - seq_printf(m, "%s\n", "UNKNOWN"); + if (first) + seq_puts(m, "UNKNOWN"); + seq_putc(m, '\n'); } else { seq_printf(m, "%s\n", "NONE"); } -- 2.25.1