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 5hPEcIZv 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+1857,17 @@ static struct folio *compaction_alloc(struct= folio *src, unsigned long data) >>>>> static void compaction_free(struct folio *dst, unsigned long data)= >>>>> { >>>>> struct compact_control *cc =3D (struct compact_control *)data; >>>>> + int order =3D folio_order(dst); >>>>> + struct page *page =3D &dst->page; >>>>> + >>>>> + folio_set_count(dst, 0); >>>> >>>> We can't change refcount to 0 like this, after it was already set to= 1 and >>>> somebody else might have done get_page_unless_zero(). You need to ei= ther >>>> put_page_testzero() and if it's false, consider the page lost, or le= ave it >>>> refcounted and adjust the code to handle both refcounted and non-ref= counted >>>> pages on the lists (the first option is simpler and shouldn't be too= bad). >>> Got it. Will fix it with the first option. Thanks. >> >> Do you think we should have a WARN or WARN_ONCE if we lose a page here= ? > > No, no WARN, it all happens legitimately. It's only our compaction losi= ng > the page - whoever would do the get_page_unless_zero() to inspect that = page > would then have to put_page() which will free it back to page allocator= =2E Got it. Thanks for the explanation. -- Best Regards, Yan, Zi --=_MailMate_40B1309B-C45A-48CC-9A08-24B5DC789F4F_= Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iQJDBAEBCgAtFiEE6rR4j8RuQ2XmaZol4n+egRQHKFQFAmXGj2QPHHppeUBudmlk aWEuY29tAAoJEOJ/noEUByhU55YP/3bCxavjUh0cBZ5rgFbgSEQNJi7vabDHlKeS XPuEfd4NDZiGU3313jG5aZAeB03y2p4Cv+K+xr0fv0vI8Ut+E4QXzApmLE/85T5i B5L0qAMbRWjYx5CVwpyWkoMs6k87Iz4KEXwp9wFbvpiEvpQl+nb6md1PdSBZEcp1 f4ukNapBscfditJounJttNJDtlpxgFX/JOael2ajib0I7fU+7mIeAoZtp3iUQyCp PaCFWrj65wuBq/dcykyJD6zZmHUe1EsFj41EGj1rje2sy60ad/4XIjv3De9ilObY Szuq3AfnpJYj5pTtIAm1csbhOosT3J/N54vtiDWG4zsmlM+0LvFwSrytbC271MdZ UvjNu41GAzn1jGt0rNUaAUYIZVnH3ejtkbFIaZr8kWXbkX5pYTBB9lujl7Hiags+ hBP6xICbzE2dpX0eHWcgJbzAc2mR9aTQ8vPU6xlI7fqaOffC7DY42kHuRIh1lku4 a93Ynh15yTdDMxfeNecL2k2i34n0hIc/i9P1mk4T7O+8y0p1qSavkSxx/v3+ax/S M5PAdlIkRnbEHFlCqT7uQiwMjp3/lE7PPD9QiPa8qCkJs21s5uxpF51HWp5mtZjF qB+SD5rhledDnYsecdhWMXvAZnma2mV6fHe7V3dQSkncMbhlXaQ01i2YBpuD7V8/ ZmQHL2yX =OxvX -----END PGP SIGNATURE----- --=_MailMate_40B1309B-C45A-48CC-9A08-24B5DC789F4F_=--