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 BDCBF3C3BFB; Mon, 20 Apr 2026 19:29:04 +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=1776713344; cv=none; b=nHIbK+Y/lk2/+09HjESinahUk7QQOhsqBvrl+M6foJf3w0MsK1/lBg8TN1zb59TtRjdBIrCkXf68qHdGXM2OK4TFW73luUxu56fuRdO3dNc2g9TnqrIdcF2BjqQx8N3UK9lBmZ0d5jGxEvuZkXHOhZovY30IL8wnOeqdd1EXCcs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776713344; c=relaxed/simple; bh=QdgAajlf6kAwRHtkgflL6wCDhjveKOc9T3w7CaJc3Ac=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=CUD5lXvy/qBF2b6sxsdlKsuZkIDEPpwSCQ/LQVib5YnEJ7lFTzOSxN/dIL+2/Rt+SPa9sZ232vMnucidwpWlADAnlP8ry1qPcfSCMGCTWQFELreK3e43Bm2ZnQaZnhjOPGdq8itFAaVvthoBJ1i9OBmzJwzGgzQZnxegoEX4DIw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=hJH6Mnra; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="hJH6Mnra" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6018AC19425; Mon, 20 Apr 2026 19:29:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776713344; bh=QdgAajlf6kAwRHtkgflL6wCDhjveKOc9T3w7CaJc3Ac=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=hJH6MnrayH7tH7XZNu4+MSSVAtDe6/j7JkTnUkZ0vRtSmV6VgsTR719xNXjz+vuae bG7WsXAbqdu9ujKzv4fC/pGW1a6KxsqJdlftGLAUSHU6jkkY0/zTvjjwPZ6m/nRUc/ qkn0wyAkW1gNLhWsnHGbK2KOkFz+cXC1sQvZRxR14c9ssIVBO18l1ZH+U1B9/KUkdh 8WUbGg4Uh3JvLzI3RHfBzNg0CCXVUzTVXGZKHpYsky2nuIdsnZbRyWwrk65SzNw1hP o5Pqr/LfmAROKXeF+HX5+mxZ+gUe2vI/KXisxiSnBMs3UfHIKBMIoEi8wUwlqLph/0 oL1GZBpyWKvgg== Message-ID: <2809fac6-44ef-426a-923d-01661e2f428c@kernel.org> Date: Mon, 20 Apr 2026 21:28:59 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH 1/2] mm/gup: add missing pXdp_get() conversions To: Alexander Gordeev , Kevin Brodsky , Ryan Roberts , Andrew Morton Cc: linux-s390@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Gerald Schaefer , Heiko Carstens , Vasily Gorbik References: <3d0213714273d83c07cb7681119b799ca77984b9.1776684344.git.agordeev@linux.ibm.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 4/20/26 14:13, Alexander Gordeev wrote: > PMD and PUD entries revalidation has the same semantics as > PTE entry revalidation. Convert the remaining direct entry > dereferences to the corresponding pXdp_get() accessors. > > Signed-off-by: Alexander Gordeev > --- > mm/gup.c | 6 +++--- > 1 file changed, 3 insertions(+), 3 deletions(-) > > diff --git a/mm/gup.c b/mm/gup.c > index 8e7dc2c6ee73..d149a4b0df71 100644 > --- a/mm/gup.c > +++ b/mm/gup.c > @@ -2865,7 +2865,7 @@ static int gup_fast_pte_range(pmd_t pmd, pmd_t *pmdp, unsigned long addr, > if (!folio) > goto pte_unmap; > > - if (unlikely(pmd_val(pmd) != pmd_val(*pmdp)) || > + if (unlikely(pmd_val(pmd) != pmd_val(pmdp_get(pmdp))) || > unlikely(pte_val(pte) != pte_val(ptep_get(ptep)))) { > gup_put_folio(folio, 1, flags); > goto pte_unmap; > @@ -2942,7 +2942,7 @@ static int gup_fast_pmd_leaf(pmd_t orig, pmd_t *pmdp, unsigned long addr, > if (!folio) > return 0; > > - if (unlikely(pmd_val(orig) != pmd_val(*pmdp))) { > + if (unlikely(pmd_val(orig) != pmd_val(pmdp_get(pmdp)))) { > gup_put_folio(folio, refs, flags); > return 0; > } > @@ -2985,7 +2985,7 @@ static int gup_fast_pud_leaf(pud_t orig, pud_t *pudp, unsigned long addr, > if (!folio) > return 0; > > - if (unlikely(pud_val(orig) != pud_val(*pudp))) { > + if (unlikely(pud_val(orig) != pud_val(pudp_get(pudp)))) { > gup_put_folio(folio, refs, flags); > return 0; > } These are all on lockless code paths. Shouldn't we be using the lockless pte/pmd variants? (not a matter of correctness, rather a matter of semantics) -- Cheers, David