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See http://www.infradead.org/rpr.html X-Rspam-User: X-Rspamd-Queue-Id: 3CDA9A0008 X-Rspamd-Server: rspam04 X-Stat-Signature: tmjdn7x9t3yxe6he3x51s1kxcmpw6jua X-HE-Tag: 1745353545-556586 X-HE-Meta: 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 eTBrNTJB 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 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: List-Subscribe: List-Unsubscribe: --=-Ur9cZciEJ7G6ugZkCBza Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2025-04-22 at 13:20 -0700, Andrew Morton wrote: > On Tue, 22 Apr 2025 17:08:06 +0800 Ruihan Li wrote: >=20 > > Hi Mike, > >=20 > > Thanks for your review! > >=20 > > On Mon, Apr 21, 2025 at 07:41:43PM +0300, Mike Rapoport wrote: > > > On Sat, Apr 19, 2025 at 08:28:01PM +0800, Ruihan Li wrote: > > > > Currently, memmap_init initializes pfn_hole with 0 instead of > > > > ARCH_PFN_OFFSET. Then init_unavailable_range will start iterating e= ach > > > > page from the page at address zero to the first available page, but= it > > > > won't do anything for pages below ARCH_PFN_OFFSET because pfn_valid > > > > won't pass. > > > >=20 > > > > If ARCH_PFN_OFFSET is very large (e.g., something like 2^64-2GiB if= the > > > > kernel is used as a library and loaded at a very high address), the > > > > pointless iteration for pages below ARCH_PFN_OFFSET will take a ver= y > > > > long time, and the kernel will look stuck at boot time. > > > >=20 > > > > This commit sets the initial value of pfn_hole to ARCH_PFN_OFFSET, = which > > > > avoids the problematic and useless iteration mentioned above. > > > >=20 > > > > This problem has existed since commit 907ec5fca3dc ("mm: zero remai= ning > > > > unavailable struct pages"). > > > >=20 > > > > Signed-off-by: Ruihan Li > > > > --- > > > > Link to v1: > > > > =C2=A0 - https://lore.kernel.org/linux-mm/20250418162727.1535335-1-= lrh2000@pku.edu.cn/ > > > > Changes since v1: > > > > =C2=A0 - Removed the unnecessary Fixes tag. > > > > =C2=A0 - Fixed the build issue for CONFIG_SPARSEMEM. > > > >=20 > > > > =C2=A0 mm/mm_init.c | 9 +++++++++ > > > > =C2=A0 1 file changed, 9 insertions(+) > > > >=20 > > > > diff --git a/mm/mm_init.c b/mm/mm_init.c > > > > index 84f14fa12..a697a83ff 100644 > > > > --- a/mm/mm_init.c > > > > +++ b/mm/mm_init.c > > > > @@ -969,6 +969,15 @@ static void __init memmap_init(void) > > > > =C2=A0=C2=A0 unsigned long hole_pfn =3D 0; > > > > =C2=A0=C2=A0 int i, j, zone_id =3D 0, nid; > > > > =C2=A0=20 > > > > +#ifdef CONFIG_FLATMEM > > > > + /* > > > > + * Pages below ARCH_PFN_OFFSET are invalid as far as pfn_valid is > > > > + * concerned, so don't waste time iterating on them when looking > > > > + * for holes. > > > > + */ > > > > + hole_pfn =3D ARCH_PFN_OFFSET; > > > > +#endif > > > > + > > >=20 > > > I'd prefer a solution for both FLATMEM and SPARSMEM.=20 > > >=20 > > > David Woodhouse proposed a for_each_valid_pfn() a while ago: > > >=20 > > > https://lore.kernel.org/all/20250404155959.3442111-1-dwmw2@infradead.= org > > >=20 > > > It can be used in init_unavailable_range() and will essentially skip = the > > > unpopulated memory map. > >=20 > > for_each_valid_pfn sounds much better. Thanks for your input. > >=20 > > However, the problem is that David's patch is not showing up in the > > mainline, so what can I do to move forward with my patch? > >=20 > > Perhaps you mean that I should wait until David's patch is merged and > > send another patch to fix the problem? >=20 > (cc David) Want to add a patch on top of my tree at https://git.infradead.org/users/dwmw2/linux.git/shortlog/refs/heads/for_eac= h_valid_pfn and I'll send it on with the rest? --=-Ur9cZciEJ7G6ugZkCBza Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCD9Aw ggSOMIIDdqADAgECAhAOmiw0ECVD4cWj5DqVrT9PMA0GCSqGSIb3DQEBCwUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBDQTAeFw0yNDAxMzAwMDAwMDBaFw0zMTEx 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