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b=ofv89aVIYd0IbAdoYRts6tCrlsW/biaOf5xmsUAwpzPSRpgIs9Li1GKDDfQWI14Yb nnk6MDzcjK6R/FR4tB182JY1qKk1vs1549StOht7tUz4YeFuUfI5tDZtBna2CypCHe DGaLH/qRgrcC9PFGGGqARc8lR9t/QlmRJIASssB3Q4dKhmEjK+uwKCnACmz1E2yH++ mQFJWyWDCvdmRZbQgzbIFDjJxNzRl+TnuGvQClRTpbZDiNB4o8t6JDTkkuLDvvN+OE 6NOeWUCD05UHfY5cw5lGV9UEYz4qDnESis6u7yBZ2djBgHEi3AObxBKRtyjD0SDu2j aWA/dW27t3FGA== From: SJ Park To: Andrew Morton Cc: Enze Li , SJ Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 7/7] samples/damon/mtier: add comment for struct region_range Date: Mon, 31 Aug 2026 07:26:09 -0700 Message-ID: <20260831142611.77572-8-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260831142611.77572-1-sj@kernel.org> References: <20260831142611.77572-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: 1sgs3obemuz63je48i85pebppt1e8zkz X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 08D3140004 X-Rspam-User: X-HE-Tag: 1788186386-595335 X-HE-Meta: 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 0DEgU5de GNg/7IPTq4zVWxO+AZ1M4Jul95iidhNoGeqnYJEp9OZ4WJu0j6UdVlmLELFSsrbqrH50wsuTGtaefX6jBSgdltq/goyt5OtYIMm5DPw2P6gaKDnmeLofQOnGIC3z+gIUAUKBmsuG940umaHuNZw+EkLE5wQGL4t//uOohj4uUWd+PjGSP4YUO5B1io+ghWwVGhAAJqv7p6ZnKlkqB546YjLTmGWSIti/pw1ug5ch1OxIHW6WEu5B7uwo+pvWxU1E+rC/0huyyAcf2aAYL9O0BjbvfNA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Enze Li The mtier sample defines a local struct region_range using phys_addr_t instead of damon_addr_range which uses unsigned long. Add a comment explaining the rationale: on 32-bit systems with more than 4GiB memory, phys_addr_t will be 64-bit while unsigned long is 32-bit. Signed-off-by: Enze Li Reviewed-by: SJ Park Signed-off-by: SJ Park --- Changes from v1 - v1: https://lore.kernel.org/20260721070756.54435-1-lienze@kylinos.cn - Collect R-b: from SJ. - Rebase to latest mm-new. samples/damon/mtier.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/samples/damon/mtier.c b/samples/damon/mtier.c index d1123ebbfab90..bea45c87cc9be 100644 --- a/samples/damon/mtier.c +++ b/samples/damon/mtier.c @@ -52,6 +52,11 @@ module_param(detect_node_addresses, bool, 0600); static struct damon_ctx *ctxs[2]; +/* + * Use phys_addr_t instead of damon_addr_range (unsigned long) for physical + * addresses. On 32-bit systems with more than 4GB memory, phys_addr_t will + * be 64-bit while unsigned long is 32-bit. + */ struct region_range { phys_addr_t start; phys_addr_t end; -- 2.47.3