From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 648CE18C03F for ; Mon, 7 Apr 2025 04:44:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744001061; cv=none; b=iLB95SpbXZcIx50kdkzrRdK5mGZo4c+T9GlaHjRYqpXqOhbML9TxcOJMyI1serkaPnH0otfP2fJQRGeqVzkEtusSsbgEy7kD8Fk1autoYuHQGpx/NawzZweV+NXQA9pa+DY/T9IHaq+x/wy2hLahtQ4C8q9Zasyxa7/Leemctbs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744001061; c=relaxed/simple; bh=4PkO7QQU5/6KafjQ+mQWr74Cvr+u2N3uHlAv6+RHjtA=; h=Date:To:From:Subject:Message-Id; b=En/3QiZvqE/SCaeQ9Wftkx4LekFqOiIGAl1Uf9LK/QNGBaPnvMi+YuheMFDtTj8X7gwG/qAQ6DufoumcqHi6PeRczrcRixkuoC3oIWqiS3t8KWrvrUi9QIar8nU6wgyR4w1hRenbEfe6PjmVaFBmdiKNoj7djm4VWcPVb+HnGaA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=0uRuobvy; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="0uRuobvy" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C637EC4CEDD; Mon, 7 Apr 2025 04:44:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1744001059; bh=4PkO7QQU5/6KafjQ+mQWr74Cvr+u2N3uHlAv6+RHjtA=; h=Date:To:From:Subject:From; b=0uRuobvy/UcKWLZYLWN5EJu41kzZlkyow/b7YB7ziI0Jemyeb5GeqGYV2XWu+A2Mw pS2hzkGatUgUZivMsI3X2h9jAId8Pu5by7ocM1DSVO89vPTlsh77avV0mT8UzTrdXu qqOyq9hGerLJ4FcxHWBTIgD3f6wqHRsjLKNBlmeU= Date: Sun, 06 Apr 2025 21:44:19 -0700 To: mm-commits@vger.kernel.org,yanjun.zhu@linux.dev,osalvador@suse.de,mingo@kernel.org,david@redhat.com,bhe@redhat.com,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-gup-remove-gup_fast_pgd_leaf-and-clean-up-the-relevant-codes.patch added to mm-new branch Message-Id: <20250407044419.C637EC4CEDD@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm/gup: remove gup_fast_pgd_leaf() and clean up the relevant codes has been added to the -mm mm-new branch. Its filename is mm-gup-remove-gup_fast_pgd_leaf-and-clean-up-the-relevant-codes.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-gup-remove-gup_fast_pgd_leaf-and-clean-up-the-relevant-codes.patch This patch will later appear in the mm-new branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: Baoquan He Subject: mm/gup: remove gup_fast_pgd_leaf() and clean up the relevant codes Date: Mon, 7 Apr 2025 11:03:06 +0800 In the current kernel, only pud huge page is supported in some architectures. P4d and pgd huge pages haven't been supported yet. And in mm/gup.c, there's no pgd huge page handling in the follow_page_mask() code path. Hence it doesn't make sense to only have gup_fast_pgd_leaf() in gup_fast code path. Here remove gup_fast_pgd_leaf() and clean up the relevant codes. Link: https://lkml.kernel.org/r/20250407030306.411977-4-bhe@redhat.com Signed-off-by: Baoquan He Reviewed-by: Oscar Salvador Acked-by: David Hildenbrand Cc: Ingo Molnar Cc: Yanjun.Zhu Signed-off-by: Andrew Morton --- mm/gup.c | 49 +++---------------------------------------------- 1 file changed, 3 insertions(+), 46 deletions(-) --- a/mm/gup.c~mm-gup-remove-gup_fast_pgd_leaf-and-clean-up-the-relevant-codes +++ a/mm/gup.c @@ -3172,46 +3172,6 @@ static int gup_fast_pud_leaf(pud_t orig, return 1; } -static int gup_fast_pgd_leaf(pgd_t orig, pgd_t *pgdp, unsigned long addr, - unsigned long end, unsigned int flags, struct page **pages, - int *nr) -{ - int refs; - struct page *page; - struct folio *folio; - - if (!pgd_access_permitted(orig, flags & FOLL_WRITE)) - return 0; - - BUILD_BUG_ON(pgd_devmap(orig)); - - page = pgd_page(orig); - refs = record_subpages(page, PGDIR_SIZE, addr, end, pages + *nr); - - folio = try_grab_folio_fast(page, refs, flags); - if (!folio) - return 0; - - if (unlikely(pgd_val(orig) != pgd_val(*pgdp))) { - gup_put_folio(folio, refs, flags); - return 0; - } - - if (!pgd_write(orig) && gup_must_unshare(NULL, flags, &folio->page)) { - gup_put_folio(folio, refs, flags); - return 0; - } - - if (!gup_fast_folio_allowed(folio, flags)) { - gup_put_folio(folio, refs, flags); - return 0; - } - - *nr += refs; - folio_set_referenced(folio); - return 1; -} - static int gup_fast_pmd_range(pud_t *pudp, pud_t pud, unsigned long addr, unsigned long end, unsigned int flags, struct page **pages, int *nr) @@ -3306,12 +3266,9 @@ static void gup_fast_pgd_range(unsigned next = pgd_addr_end(addr, end); if (pgd_none(pgd)) return; - if (unlikely(pgd_leaf(pgd))) { - if (!gup_fast_pgd_leaf(pgd, pgdp, addr, next, flags, - pages, nr)) - return; - } else if (!gup_fast_p4d_range(pgdp, pgd, addr, next, flags, - pages, nr)) + BUILD_BUG_ON(pgd_leaf(pgd)); + if (!gup_fast_p4d_range(pgdp, pgd, addr, next, flags, + pages, nr)) return; } while (pgdp++, addr = next, addr != end); } _ Patches currently in -mm which might be from bhe@redhat.com are maintainers-add-andrew-and-myself-as-kexec-maintainer.patch mm-gup-fix-wrongly-calculated-returned-value-in-fault_in_safe_writeable.patch mm-gup-remove-unneeded-checking-in-follow_page_pte.patch mm-gup-remove-gup_fast_pgd_leaf-and-clean-up-the-relevant-codes.patch