[{"id":3679664,"web_url":"http://patchwork.ozlabs.org/comment/3679664/","msgid":"","date":"2026-04-21T04:15:14","subject":"Re: [PATCH v3 4/4] mm/mm_init: Fix pageblock migratetype for\n ZONE_DEVICE compound pages","submitter":{"id":76330,"url":"http://patchwork.ozlabs.org/api/people/76330/","name":"Oscar Salvador","email":"osalvador@suse.de"},"content":"On Tue, Apr 21, 2026 at 10:20:44AM +0800, Muchun Song wrote:\n> The memmap_init_zone_device() function only initializes the migratetype\n> of the first pageblock of a compound page. If the compound page size\n> exceeds pageblock_nr_pages (e.g., 1GB hugepages with 2MB pageblocks),\n> subsequent pageblocks in the compound page remain uninitialized.\n> \n> Move the migratetype initialization out of __init_zone_device_page()\n> and into a separate pageblock_migratetype_init_range() function. This\n> iterates over the entire PFN range of the memory, ensuring that all\n> pageblocks are correctly initialized.\n> \n> Fixes: c4386bd8ee3a (\"mm/memremap: add ZONE_DEVICE support for compound pages\")\n> Signed-off-by: Muchun Song \n> Reviewed-by: Mike Rapoport (Microsoft) \n\nWould not the call to __init_zone_device_page() from\nmemmap_init_compound() take care of the subsequent pageblocks?","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=suse.de header.i=@suse.de header.a=rsa-sha256\n header.s=susede2_rsa header.b=uS9iGCHG;\n\tdkim=pass header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=p7mef9cN;\n\tdkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de\n header.a=rsa-sha256 header.s=susede2_rsa header.b=cpuTQ+E+;\n\tdkim=neutral header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=kOVwBphL;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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Howlett\" ,\n\tVlastimil Babka ,\n\tSuren Baghdasaryan ,\n\tMichal Hocko , Nicholas Piggin ,\n\tChristophe Leroy , aneesh.kumar@linux.ibm.com,\n\tjoao.m.martins@oracle.com, linux-mm@kvack.org,\n\tlinuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org","Subject":"Re: [PATCH v3 4/4] mm/mm_init: Fix pageblock migratetype for\n ZONE_DEVICE compound pages","Message-ID":"","References":"<20260421022044.1217503-1-songmuchun@bytedance.com>\n <20260421022044.1217503-5-songmuchun@bytedance.com>","X-Mailing-List":"linuxppc-dev@lists.ozlabs.org","List-Id":"","List-Help":"","List-Owner":"","List-Post":"","List-Archive":",\n ","List-Subscribe":",\n ,\n ","List-Unsubscribe":"","Precedence":"list","MIME-Version":"1.0","Content-Type":"text/plain; charset=us-ascii","Content-Disposition":"inline","In-Reply-To":"<20260421022044.1217503-5-songmuchun@bytedance.com>","X-Rspamd-Action":"no action","X-Rspamd-Server":"rspamd2.dmz-prg2.suse.org","X-Spamd-Result":"default: False [-4.51 / 50.00];\n\tBAYES_HAM(-3.00)[100.00%];\n\tNEURAL_HAM_LONG(-1.00)[-1.000];\n\tR_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519];\n\tNEURAL_HAM_SHORT(-0.20)[-1.000];\n\tMIME_GOOD(-0.10)[text/plain];\n\tMX_GOOD(-0.01)[];\n\tDKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519];\n\tRBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from];\n\tFUZZY_RATELIMITED(0.00)[rspamd.com];\n\tARC_NA(0.00)[];\n\tRCPT_COUNT_TWELVE(0.00)[19];\n\tTO_MATCH_ENVRCPT_ALL(0.00)[];\n\tMIME_TRACE(0.00)[0:+];\n\tSPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from];\n\tFREEMAIL_ENVRCPT(0.00)[gmail.com];\n\tFREEMAIL_CC(0.00)[linux-foundation.org,kernel.org,linux.dev,ellerman.id.au,linux.ibm.com,oracle.com,google.com,suse.com,gmail.com,kvack.org,lists.ozlabs.org,vger.kernel.org];\n\tRCVD_TLS_ALL(0.00)[];\n\tRCVD_COUNT_TWO(0.00)[2];\n\tFROM_EQ_ENVFROM(0.00)[];\n\tFROM_HAS_DN(0.00)[];\n\tTO_DN_SOME(0.00)[];\n\tDNSWL_BLOCKED(0.00)[2a07:de40:b281:106:10:150:64:167:received,2a07:de40:b281:104:10:150:64:97:from];\n\tRCVD_VIA_SMTP_AUTH(0.00)[];\n\tRECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received];\n\tDKIM_TRACE(0.00)[suse.de:+];\n\tMISSING_XM_UA(0.00)[];\n\tDBL_BLOCKED_OPENRESOLVER(0.00)[bytedance.com:email,suse.de:dkim,imap1.dmz-prg2.suse.org:helo,imap1.dmz-prg2.suse.org:rdns,localhost.localdomain:mid]","X-Rspamd-Queue-Id":"081445BCDE","X-Spam-Score":"-4.51","X-Spam-Level":"","X-Spam-Status":"No, score=-2.5 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tDKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_PASS\n\tautolearn=disabled version=4.0.1 OzLabs 8","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org"}},{"id":3679698,"web_url":"http://patchwork.ozlabs.org/comment/3679698/","msgid":"<9343F329-BCD4-4D64-94CB-A94F0E9E4400@linux.dev>","date":"2026-04-21T06:54:35","subject":"Re: [PATCH v3 4/4] mm/mm_init: Fix pageblock migratetype for\n ZONE_DEVICE compound pages","submitter":{"id":84878,"url":"http://patchwork.ozlabs.org/api/people/84878/","name":"Muchun Song","email":"muchun.song@linux.dev"},"content":"> On Apr 21, 2026, at 12:15, Oscar Salvador wrote:\n> \n> On Tue, Apr 21, 2026 at 10:20:44AM +0800, Muchun Song wrote:\n>> The memmap_init_zone_device() function only initializes the migratetype\n>> of the first pageblock of a compound page. If the compound page size\n>> exceeds pageblock_nr_pages (e.g., 1GB hugepages with 2MB pageblocks),\n>> subsequent pageblocks in the compound page remain uninitialized.\n>> \n>> Move the migratetype initialization out of __init_zone_device_page()\n>> and into a separate pageblock_migratetype_init_range() function. This\n>> iterates over the entire PFN range of the memory, ensuring that all\n>> pageblocks are correctly initialized.\n>> \n>> Fixes: c4386bd8ee3a (\"mm/memremap: add ZONE_DEVICE support for compound pages\")\n>> Signed-off-by: Muchun Song \n>> Reviewed-by: Mike Rapoport (Microsoft) \n> \n> Would not the call to __init_zone_device_page() from\n> memmap_init_compound() take care of the subsequent pageblocks?\n> \n\nNo, it won't handle them automatically, as the page count from\ncompound_nr_pages doesn't cover the following pageblocks.\n\nThanks.\nMuchun\n\n> \n> -- \n> Oscar Salvador\n> SUSE Labs","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256\n header.s=key1 header.b=pk7L4Wn0;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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Howlett\" ,\n Vlastimil Babka ,\n Suren Baghdasaryan ,\n Michal Hocko ,\n Nicholas Piggin ,\n Christophe Leroy ,\n aneesh.kumar@linux.ibm.com,\n joao.m.martins@oracle.com,\n linux-mm@kvack.org,\n linuxppc-dev@lists.ozlabs.org,\n linux-kernel@vger.kernel.org","Content-Transfer-Encoding":"quoted-printable","Message-Id":"<9343F329-BCD4-4D64-94CB-A94F0E9E4400@linux.dev>","References":"<20260421022044.1217503-1-songmuchun@bytedance.com>\n <20260421022044.1217503-5-songmuchun@bytedance.com>\n ","To":"Oscar Salvador ","X-Migadu-Flow":"FLOW_OUT","X-Spam-Status":"No, score=-0.2 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tDKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_PASS,SPF_PASS autolearn=disabled\n\tversion=4.0.1 OzLabs 8","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org"}},{"id":3679708,"web_url":"http://patchwork.ozlabs.org/comment/3679708/","msgid":"","date":"2026-04-21T07:29:43","subject":"Re: [PATCH v3 4/4] mm/mm_init: Fix pageblock migratetype for\n ZONE_DEVICE compound pages","submitter":{"id":76330,"url":"http://patchwork.ozlabs.org/api/people/76330/","name":"Oscar Salvador","email":"osalvador@suse.de"},"content":"On Tue, Apr 21, 2026 at 02:54:35PM +0800, Muchun Song wrote:\n> \n> \n> > On Apr 21, 2026, at 12:15, Oscar Salvador wrote:\n> > \n> > On Tue, Apr 21, 2026 at 10:20:44AM +0800, Muchun Song wrote:\n> >> The memmap_init_zone_device() function only initializes the migratetype\n> >> of the first pageblock of a compound page. If the compound page size\n> >> exceeds pageblock_nr_pages (e.g., 1GB hugepages with 2MB pageblocks),\n> >> subsequent pageblocks in the compound page remain uninitialized.\n> >> \n> >> Move the migratetype initialization out of __init_zone_device_page()\n> >> and into a separate pageblock_migratetype_init_range() function. This\n> >> iterates over the entire PFN range of the memory, ensuring that all\n> >> pageblocks are correctly initialized.\n> >> \n> >> Fixes: c4386bd8ee3a (\"mm/memremap: add ZONE_DEVICE support for compound pages\")\n> >> Signed-off-by: Muchun Song \n> >> Reviewed-by: Mike Rapoport (Microsoft) \n\nReviewed-by: Oscar Salvador \n\n> > Would not the call to __init_zone_device_page() from\n> > memmap_init_compound() take care of the subsequent pageblocks?\n> > \n> \n> No, it won't handle them automatically, as the page count from\n> compound_nr_pages doesn't cover the following pageblocks.\n\nOk, I see.","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=suse.de header.i=@suse.de header.a=rsa-sha256\n header.s=susede2_rsa header.b=xEksfWTK;\n\tdkim=pass header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=qUQJoihJ;\n\tdkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de\n header.a=rsa-sha256 header.s=susede2_rsa header.b=xEksfWTK;\n\tdkim=neutral header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=qUQJoihJ;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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Howlett\" ,\n\tVlastimil Babka ,\n\tSuren Baghdasaryan ,\n\tMichal Hocko , Nicholas Piggin ,\n\tChristophe Leroy , aneesh.kumar@linux.ibm.com,\n\tjoao.m.martins@oracle.com, linux-mm@kvack.org,\n\tlinuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org","Subject":"Re: [PATCH v3 4/4] mm/mm_init: Fix pageblock migratetype for\n ZONE_DEVICE compound pages","Message-ID":"","References":"<20260421022044.1217503-1-songmuchun@bytedance.com>\n <20260421022044.1217503-5-songmuchun@bytedance.com>\n \n <9343F329-BCD4-4D64-94CB-A94F0E9E4400@linux.dev>","X-Mailing-List":"linuxppc-dev@lists.ozlabs.org","List-Id":"","List-Help":"","List-Owner":"","List-Post":"","List-Archive":",\n ","List-Subscribe":",\n ,\n ","List-Unsubscribe":"","Precedence":"list","MIME-Version":"1.0","Content-Type":"text/plain; charset=us-ascii","Content-Disposition":"inline","In-Reply-To":"<9343F329-BCD4-4D64-94CB-A94F0E9E4400@linux.dev>","X-Spamd-Result":"default: False [-4.51 / 50.00];\n\tBAYES_HAM(-3.00)[100.00%];\n\tNEURAL_HAM_LONG(-1.00)[-1.000];\n\tR_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519];\n\tNEURAL_HAM_SHORT(-0.20)[-1.000];\n\tMIME_GOOD(-0.10)[text/plain];\n\tMX_GOOD(-0.01)[];\n\tFREEMAIL_ENVRCPT(0.00)[gmail.com];\n\tDKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519];\n\tFUZZY_RATELIMITED(0.00)[rspamd.com];\n\tRBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from];\n\tSPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from];\n\tARC_NA(0.00)[];\n\tRCPT_COUNT_TWELVE(0.00)[19];\n\tMIME_TRACE(0.00)[0:+];\n\tTO_MATCH_ENVRCPT_ALL(0.00)[];\n\tFREEMAIL_CC(0.00)[bytedance.com,linux-foundation.org,kernel.org,ellerman.id.au,linux.ibm.com,oracle.com,google.com,suse.com,gmail.com,kvack.org,lists.ozlabs.org,vger.kernel.org];\n\tRCVD_TLS_ALL(0.00)[];\n\tRCVD_COUNT_TWO(0.00)[2];\n\tFROM_EQ_ENVFROM(0.00)[];\n\tFROM_HAS_DN(0.00)[];\n\tTO_DN_SOME(0.00)[];\n\tRECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received];\n\tMISSING_XM_UA(0.00)[];\n\tRCVD_VIA_SMTP_AUTH(0.00)[];\n\tDKIM_TRACE(0.00)[suse.de:+];\n\tDBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:dkim,suse.de:email,imap1.dmz-prg2.suse.org:helo,imap1.dmz-prg2.suse.org:rdns]","X-Rspamd-Action":"no action","X-Spam-Score":"-4.51","X-Spam-Level":"","X-Rspamd-Server":"rspamd1.dmz-prg2.suse.org","X-Rspamd-Queue-Id":"1D01F5BCDE","X-Spam-Status":"No, score=-2.5 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tDKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_PASS\n\tautolearn=disabled version=4.0.1 OzLabs 8","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org"}},{"id":3679770,"web_url":"http://patchwork.ozlabs.org/comment/3679770/","msgid":"<67CABBD2-FA75-40D0-909D-9B6A523CCC8C@linux.dev>","date":"2026-04-21T09:31:36","subject":"Re: [PATCH v3 4/4] mm/mm_init: Fix pageblock migratetype for\n ZONE_DEVICE compound pages","submitter":{"id":84878,"url":"http://patchwork.ozlabs.org/api/people/84878/","name":"Muchun Song","email":"muchun.song@linux.dev"},"content":"> On Apr 21, 2026, at 10:20, Muchun Song wrote:\n> \n> The memmap_init_zone_device() function only initializes the migratetype\n> of the first pageblock of a compound page. If the compound page size\n> exceeds pageblock_nr_pages (e.g., 1GB hugepages with 2MB pageblocks),\n> subsequent pageblocks in the compound page remain uninitialized.\n> \n> Move the migratetype initialization out of __init_zone_device_page()\n> and into a separate pageblock_migratetype_init_range() function. This\n> iterates over the entire PFN range of the memory, ensuring that all\n> pageblocks are correctly initialized.\n> \n> Fixes: c4386bd8ee3a (\"mm/memremap: add ZONE_DEVICE support for compound pages\")\n> Signed-off-by: Muchun Song \n> Reviewed-by: Mike Rapoport (Microsoft) \n> ---\n> mm/mm_init.c | 43 ++++++++++++++++++++++++++++---------------\n> 1 file changed, 28 insertions(+), 15 deletions(-)\n> \n> diff --git a/mm/mm_init.c b/mm/mm_init.c\n> index f9f8e1af921c..e2d8eae23aa3 100644\n> --- a/mm/mm_init.c\n> +++ b/mm/mm_init.c\n> @@ -674,6 +674,19 @@ static inline void fixup_hashdist(void)\n> static inline void fixup_hashdist(void) {}\n> #endif /* CONFIG_NUMA */\n> \n> +static __meminit void pageblock_migratetype_init_range(unsigned long pfn,\n> + unsigned long nr_pages,\n> + int migratetype)\n> +{\n> + \tunsigned long end = pfn + nr_pages;\n> +\n> + \tfor (pfn = pageblock_align(pfn); pfn < end; pfn += pageblock_nr_pages) {\n> + \t\tinit_pageblock_migratetype(pfn_to_page(pfn), migratetype, false);\n> + \t\tif (IS_ALIGNED(pfn, PAGES_PER_SECTION))\n> + \t\t\tcond_resched();\n> + \t}\n> +}\n\nI found a positive comment from AI review:\n\nThis trigger a -Wunused-function warning when CONFIG_ZONE_DEVICE is\ndisabled.\n\nI'll fix it in the next version.\n\nThanks.","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256\n header.s=key1 header.b=bF6yocuu;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=112.213.38.117; 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Howlett\" ,\n Vlastimil Babka ,\n Suren Baghdasaryan ,\n Michal Hocko ,\n Nicholas Piggin ,\n Christophe Leroy ,\n aneesh.kumar@linux.ibm.com,\n joao.m.martins@oracle.com,\n linux-mm@kvack.org,\n linuxppc-dev@lists.ozlabs.org,\n linux-kernel@vger.kernel.org","Content-Transfer-Encoding":"quoted-printable","Message-Id":"<67CABBD2-FA75-40D0-909D-9B6A523CCC8C@linux.dev>","References":"<20260421022044.1217503-1-songmuchun@bytedance.com>\n <20260421022044.1217503-5-songmuchun@bytedance.com>","To":"Muchun Song ","X-Migadu-Flow":"FLOW_OUT","X-Spam-Status":"No, score=-0.2 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tDKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_PASS,SPF_PASS autolearn=disabled\n\tversion=4.0.1 OzLabs 8","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org"}}]