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[2003:d8:2f23:c700:d8ae:41bf:492a:9e4c]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3bb6475857dsm4748985f8f.2.2025.08.16.00.28.24 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 16 Aug 2025 00:28:24 -0700 (PDT) Message-ID: Date: Sat, 16 Aug 2025 09:28:23 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH V2] mm/migrate: Fix NULL movable_ops if CONFIG_ZSMALLOC=m To: Huacai Chen , Huacai Chen , Andrew Morton Cc: linux-mm@kvack.org, Zi Yan , Lorenzo Stoakes , Harry Yoo , linux-kernel@vger.kernel.org References: <20250816072149.1952348-1-chenhuacai@loongson.cn> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK 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get such an error message if CONFIG_ZSMALLOC=m: > > WARNING: CPU: 3 PID: 42 at mm/migrate.c:142 isolate_movable_ops_page+0xa8/0x1c0 > CPU: 3 UID: 0 PID: 42 Comm: kcompactd0 Not tainted 6.16.0-rc5+ #2133 PREEMPT > pc 9000000000540bd8 ra 9000000000540b84 tp 9000000100420000 sp 9000000100423a60 > a0 9000000100193a80 a1 000000000000000c a2 000000000000001b a3 ffffffffffffffff > a4 ffffffffffffffff a5 0000000000000267 a6 0000000000000000 a7 9000000100423ae0 > t0 00000000000000f1 t1 00000000000000f6 t2 0000000000000000 t3 0000000000000001 > t4 ffffff00010eb834 t5 0000000000000040 t6 900000010c89d380 t7 90000000023fcc70 > t8 0000000000000018 u0 0000000000000000 s9 ffffff00010eb800 s0 ffffff00010eb800 > s1 000000000000000c s2 0000000000043ae0 s3 0000800000000000 s4 900000000219cc40 > s5 0000000000000000 s6 ffffff00010eb800 s7 0000000000000001 s8 90000000025b4000 > ra: 9000000000540b84 isolate_movable_ops_page+0x54/0x1c0 > ERA: 9000000000540bd8 isolate_movable_ops_page+0xa8/0x1c0 > CRMD: 000000b0 (PLV0 -IE -DA +PG DACF=CC DACM=CC -WE) > PRMD: 00000004 (PPLV0 +PIE -PWE) > EUEN: 00000000 (-FPE -SXE -ASXE -BTE) > ECFG: 00071c1d (LIE=0,2-4,10-12 VS=7) > ESTAT: 000c0000 [BRK] (IS= ECode=12 EsubCode=0) > PRID: 0014c010 (Loongson-64bit, Loongson-3A5000) > CPU: 3 UID: 0 PID: 42 Comm: kcompactd0 Not tainted 6.16.0-rc5+ #2133 PREEMPT > Stack : 90000000021fd000 0000000000000000 9000000000247720 9000000100420000 > 90000001004236a0 90000001004236a8 0000000000000000 90000001004237e8 > 90000001004237e0 90000001004237e0 9000000100423550 0000000000000001 > 0000000000000001 90000001004236a8 725a84864a19e2d9 90000000023fcc58 > 9000000100420000 90000000024c6848 9000000002416848 0000000000000001 > 0000000000000000 000000000000000a 0000000007fe0000 ffffff00010eb800 > 0000000000000000 90000000021fd000 0000000000000000 900000000205cf30 > 000000000000008e 0000000000000009 ffffff00010eb800 0000000000000001 > 90000000025b4000 0000000000000000 900000000024773c 00007ffff103d748 > 00000000000000b0 0000000000000004 0000000000000000 0000000000071c1d > ... > Call Trace: > [<900000000024773c>] show_stack+0x5c/0x190 > [<90000000002415e0>] dump_stack_lvl+0x70/0x9c > [<90000000004abe6c>] isolate_migratepages_block+0x3bc/0x16e0 > [<90000000004af408>] compact_zone+0x558/0x1000 > [<90000000004b0068>] compact_node+0xa8/0x1e0 > [<90000000004b0aa4>] kcompactd+0x394/0x410 > [<90000000002b3c98>] kthread+0x128/0x140 > [<9000000001779148>] ret_from_kernel_thread+0x28/0xc0 > [<9000000000245528>] ret_from_kernel_thread_asm+0x10/0x88 > > The reason is that defined(CONFIG_ZSMALLOC) evaluates to 1 only when > CONFIG_ZSMALLOC=y, we should use IS_ENABLED(CONFIG_ZSMALLOC) instead. > But when I use IS_ENABLED(CONFIG_ZSMALLOC), page_movable_ops() cannot > access zsmalloc_mops because zsmalloc_mops is in a module. > > To solve this problem, we define a movable_ops[] array in mm/migrate.c, > initialise its elements at mm/balloon_compaction.c & mm/zsmalloc.c, and > let the page_movable_ops() function return elements from movable_ops[]. > > Fixes: 84caf98838a3e5f ("mm: stop storing migration_ops in page->mapping") > Acked-by: Zi Yan > Signed-off-by: Huacai Chen > --- > V2: Use EXPORT_SYMBOL_GPL_FOR_MODULES instead of EXPORT_SYMBOL and fix build. See my review. Please wait longer for a resend, so we don't have to do this weird review dance. -- Cheers David / dhildenb