From nobody Mon Jun 8 20:54:16 2026 Received: from todd.t-8ch.de (todd.t-8ch.de [159.69.126.157]) (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 EEAA63F86F4 for ; Tue, 26 May 2026 16:43:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.69.126.157 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779813836; cv=none; b=prpzKa6HuGbU7U2ru3DdgFAcPpm1iT0kVC80H14Uz1bPs9OpvH9zKumtZ3HcqRI5ZvxX3kuRAkTSaEWyzhKwknsMIXYZLuV2KDy4u1qNkJGdM0BVWjJU9WpPkZ5g0rY6w3PnlbcjAxCpjL4rYlb6cNF0SPAFuop/hGbB4DLBQcg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779813836; c=relaxed/simple; bh=nho1EikHJQuuzgUtxGKP2/iBJa27J165GKKuz5niGzE=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:To:Cc; b=RRrE+8JwFf0Qq8L06UedjOM1mMDa9SCamfMo0nnsp6x5ZQlIDCztfvJoNQCIvnsB7ULf9O14sxUjlP5SWdiMg0uDClA5hjYJOFOe2UCZ5H4BMAbxEZF+8K2RFpG2I6h0Eyol/QqMXz+onPdt/alkQku7s1RIvfes9xrMTEmXZJY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=weissschuh.net; spf=pass smtp.mailfrom=weissschuh.net; dkim=pass (1024-bit key) header.d=weissschuh.net header.i=@weissschuh.net header.b=oElydY24; arc=none smtp.client-ip=159.69.126.157 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=weissschuh.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=weissschuh.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=weissschuh.net header.i=@weissschuh.net header.b="oElydY24" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=weissschuh.net; s=mail; t=1779813832; bh=nho1EikHJQuuzgUtxGKP2/iBJa27J165GKKuz5niGzE=; h=From:Date:Subject:To:Cc:From; b=oElydY24q1+JCusM7Dm58RP5f+OtmMk03dDmQINih4wMQjaSwB6kt0rPC9F+DTsMq cA/lzHQNrl019gRJe0XMBi5HJJYq105K+RXFowROZu9M2RZOMVYkKT4Vyx3i0pWMqz bP55FToIAZWDlEo8F1XQulxnLg3BYv0VWxC4ng7Q= From: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= Date: Tue, 26 May 2026 18:43:40 +0200 Subject: [PATCH v2] lib: kunit_iov_iter: repeatedly call alloc_pages_bulk() Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260526-kunit_iov_iter-alloc_bulk-v2-1-24fbcd995c61@weissschuh.net> X-B4-Tracking: v=1; b=H4sIAAAAAAAC/32NwQ6CMBAFf4X0bA2tWKIn/8MQ0i6rXSWtaUvVE P5dwHj1OMl7MyOLGAgjOxYjC5gpknczyE3BwGp3RU7dzEyWUpV7ueP3wVFqyeeWEgau+95Da4b +zmtVC6mUVAjA5v8j4IVeq/vcfDkO5oaQFuGysBSTD+81nsWy+3WqP50suOCV7mowGow4wOmJF GMEO9itw8SaaZo+QtDoytkAAAA= X-Change-ID: 20260523-kunit_iov_iter-alloc_bulk-767126626ecc To: "Christian A. Ehrhardt" , Andrew Morton Cc: linux-kernel@vger.kernel.org, =?utf-8?q?Thomas_Wei=C3=9Fschuh?= X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1779813832; l=1614; i=linux@weissschuh.net; s=20221212; h=from:subject:message-id; bh=nho1EikHJQuuzgUtxGKP2/iBJa27J165GKKuz5niGzE=; b=IM8vFjueMV1XzLvPyvQbpH1UezmdfnVJ7LqoKzIta3I9ZpbFkdPCi1FMALN+4Hudw9sBZo9cE jvHONBF2AetBDTzakhm8RSG2/T3aRVNh+B4VLY6mOdsC6KEpHS2G1x8 X-Developer-Key: i=linux@weissschuh.net; a=ed25519; pk=KcycQgFPX2wGR5azS7RhpBqedglOZVgRPfdFSPB1LNw= alloc_pages_bulk() is not guaranteed to return all requested pages in a single call. Call it repeatedly until all pages have been allocated or no more progress is being made. Fixes: 2d71340ff1d4 ("iov_iter: Kunit tests for copying to/from an iterator= ") Signed-off-by: Thomas Wei=C3=9Fschuh --- Changes in v2: - Use correct Fixes tag. - Link to v1: https://patch.msgid.link/20260524-kunit_iov_iter-alloc_bulk-v= 1-1-4ad7cbacb19c@weissschuh.net --- lib/tests/kunit_iov_iter.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/lib/tests/kunit_iov_iter.c b/lib/tests/kunit_iov_iter.c index f02f7b7aa796..1e6fce9cb255 100644 --- a/lib/tests/kunit_iov_iter.c +++ b/lib/tests/kunit_iov_iter.c @@ -53,7 +53,7 @@ static void *__init iov_kunit_create_buffer(struct kunit = *test, size_t npages) { struct page **pages; - unsigned long got; + unsigned long got, last; void *buffer; unsigned int i; =20 @@ -61,7 +61,15 @@ static void *__init iov_kunit_create_buffer(struct kunit= *test, KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pages); *ppages =3D pages; =20 - got =3D alloc_pages_bulk(GFP_KERNEL, npages, pages); + got =3D 0; + while (true) { + last =3D got; + got =3D alloc_pages_bulk(GFP_KERNEL, npages, pages); + + if (last =3D=3D got || got =3D=3D npages) + break; + } + if (got !=3D npages) { release_pages(pages, got); kvfree(pages); --- base-commit: 79bd2dded182b1d458b18e62684b7f82ffc682e5 change-id: 20260523-kunit_iov_iter-alloc_bulk-767126626ecc Best regards, -- =20 Thomas Wei=C3=9Fschuh