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[76.210.143.223]) by smtp.gmail.com with ESMTPSA id y6sm672139pfm.99.2021.02.26.12.18.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 26 Feb 2021 12:18:19 -0800 (PST) Subject: [PATCH 1/2] mm: Guard a use of node_reclaim_distance with CONFIFG_NUMA Date: Fri, 26 Feb 2021 12:17:20 -0800 Message-Id: <20210226201721.510177-1-palmer@dabbelt.com> X-Mailer: git-send-email 2.30.1.766.gb4fecdf3b7-goog MIME-Version: 1.0 Cc: peterz@infradead.org, srikar@linux.vnet.ibm.com, valentin.schneider@arm.com, vbabka@suse.cz, mpe@ellerman.id.au, Palmer Dabbelt , linux-kernel@vger.kernel.org, linux-mm@kvack.org, kernel-team@android.com From: Palmer Dabbelt To: akpm@linux-foundation.org, atishp@atishpatra.org X-Stat-Signature: bj46wtaww3oz7n8ohpop7is8kw1epiyy X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 2BA53C0001FE Received-SPF: none (dabbelt.com>: No applicable sender policy available) receiver=imf03; identity=mailfrom; envelope-from=""; helo=mail-pj1-f49.google.com; client-ip=209.85.216.49 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1614370698-585775 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Palmer Dabbelt This is only useful under CONFIG_NUMA. IIUC skipping the check is the right thing to do here, as without CONFIG_NUMA there will never be any large node distances on non-NUMA systems. I expected this to manifest as a link failure under (!CONFIG_NUMA && CONFIG_TRANSPARENT_HUGE_PAGES), but I'm not actually seeing that. I think the reference is just getting pruned before it's checked, but I didn't get that from reading the code so I'm worried I'm missing something. Either way, this is necessary to guard the definition of node_reclaim_distance with CONFIG_NUMA. Signed-off-by: Palmer Dabbelt --- mm/khugepaged.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index a7d6cb912b05..b1bf191c3a54 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -819,8 +819,10 @@ static bool khugepaged_scan_abort(int nid) for (i = 0; i < MAX_NUMNODES; i++) { if (!khugepaged_node_load[i]) continue; +#ifdef CONFIG_NUMA if (node_distance(nid, i) > node_reclaim_distance) return true; +#endif } return false; }