From nobody Tue Dec 30 14:35:37 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BCF5DC54FB9 for ; Wed, 15 Nov 2023 15:50:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232277AbjKOPuV (ORCPT ); Wed, 15 Nov 2023 10:50:21 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37366 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231829AbjKOPuL (ORCPT ); Wed, 15 Nov 2023 10:50:11 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6471E1A5 for ; Wed, 15 Nov 2023 07:50:05 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1700063404; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=4ut+h9nLVtpMfUa14begCRaPNr+Lp71R8/RKDVqE44g=; b=BKvegH2iAe/Ii2eH+0cuMS8pjwbk/RCy8fbc48Kv4GC7Ys6xWyQMr2xOvaTQW/ac4V5bWr Wr5cVyteEbwgO2nguTgJ35O9+WqaKstXMeDdIRJIv8l3SCm/pEDsU/t6MuI8pY8qB62p5s XutVaOG4KBCVmtl7LDsnW/+V5Jvwub0= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-81-Uwpo4MoJOvqOauyzpGI_Bw-1; Wed, 15 Nov 2023 10:50:01 -0500 X-MC-Unique: Uwpo4MoJOvqOauyzpGI_Bw-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 1715F811E82; Wed, 15 Nov 2023 15:50:00 +0000 (UTC) Received: from warthog.procyon.org.com (unknown [10.42.28.16]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8503F40C6EB9; Wed, 15 Nov 2023 15:49:57 +0000 (UTC) From: David Howells To: Christian Brauner Cc: David Howells , Jens Axboe , Al Viro , Linus Torvalds , Christoph Hellwig , David Laight , Matthew Wilcox , Brendan Higgins , David Gow , linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, kunit-dev@googlegroups.com, linux-kernel@vger.kernel.org, Christian Brauner , David Hildenbrand , John Hubbard Subject: [PATCH v3 02/10] iov_iter: Consolidate some of the repeated code into helpers Date: Wed, 15 Nov 2023 15:49:38 +0000 Message-ID: <20231115154946.3933808-3-dhowells@redhat.com> In-Reply-To: <20231115154946.3933808-1-dhowells@redhat.com> References: <20231115154946.3933808-1-dhowells@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.2 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Consolidate some of the repeated code snippets into helper functions to reduce the line count. Signed-off-by: David Howells cc: Christoph Hellwig cc: Christian Brauner cc: Jens Axboe cc: Al Viro cc: David Hildenbrand cc: John Hubbard cc: Brendan Higgins cc: David Gow cc: linux-kselftest@vger.kernel.org cc: kunit-dev@googlegroups.com cc: linux-mm@kvack.org cc: linux-fsdevel@vger.kernel.org --- lib/kunit_iov_iter.c | 189 +++++++++++++++++++------------------------ 1 file changed, 84 insertions(+), 105 deletions(-) diff --git a/lib/kunit_iov_iter.c b/lib/kunit_iov_iter.c index 4a6c0efd33f5..ee586eb652b4 100644 --- a/lib/kunit_iov_iter.c +++ b/lib/kunit_iov_iter.c @@ -19,18 +19,18 @@ MODULE_AUTHOR("David Howells "); MODULE_LICENSE("GPL"); =20 struct kvec_test_range { - int from, to; + int page, from, to; }; =20 static const struct kvec_test_range kvec_test_ranges[] =3D { - { 0x00002, 0x00002 }, - { 0x00027, 0x03000 }, - { 0x05193, 0x18794 }, - { 0x20000, 0x20000 }, - { 0x20000, 0x24000 }, - { 0x24000, 0x27001 }, - { 0x29000, 0xffffb }, - { 0xffffd, 0xffffe }, + { 0, 0x00002, 0x00002 }, + { 0, 0x00027, 0x03000 }, + { 0, 0x05193, 0x18794 }, + { 0, 0x20000, 0x20000 }, + { 0, 0x20000, 0x24000 }, + { 0, 0x24000, 0x27001 }, + { 0, 0x29000, 0xffffb }, + { 0, 0xffffd, 0xffffe }, { -1 } }; =20 @@ -69,6 +69,57 @@ static void *__init iov_kunit_create_buffer(struct kunit= *test, return buffer; } =20 +/* + * Build the reference pattern in the scratch buffer that we expect to see= in + * the iterator buffer (ie. the result of copy *to*). + */ +static void iov_kunit_build_to_reference_pattern(struct kunit *test, u8 *s= cratch, + size_t bufsize, + const struct kvec_test_range *pr) +{ + int i, patt =3D 0; + + memset(scratch, 0, bufsize); + for (; pr->page >=3D 0; pr++) + for (i =3D pr->from; i < pr->to; i++) + scratch[i] =3D pattern(patt++); +} + +/* + * Build the reference pattern in the iterator buffer that we expect to se= e in + * the scratch buffer (ie. the result of copy *from*). + */ +static void iov_kunit_build_from_reference_pattern(struct kunit *test, u8 = *buffer, + size_t bufsize, + const struct kvec_test_range *pr) +{ + size_t i =3D 0, j; + + memset(buffer, 0, bufsize); + for (; pr->page >=3D 0; pr++) { + for (j =3D pr->from; j < pr->to; j++) { + buffer[i++] =3D pattern(j); + if (i >=3D bufsize) + return; + } + } +} + +/* + * Compare two kernel buffers to see that they're the same. + */ +static void iov_kunit_check_pattern(struct kunit *test, const u8 *buffer, + const u8 *scratch, size_t bufsize) +{ + size_t i; + + for (i =3D 0; i < bufsize; i++) { + KUNIT_EXPECT_EQ_MSG(test, buffer[i], scratch[i], "at i=3D%x", i); + if (buffer[i] !=3D scratch[i]) + return; + } +} + static void __init iov_kunit_load_kvec(struct kunit *test, struct iov_iter *iter, int dir, struct kvec *kvec, unsigned int kvmax, @@ -79,7 +130,7 @@ static void __init iov_kunit_load_kvec(struct kunit *tes= t, int i; =20 for (i =3D 0; i < kvmax; i++, pr++) { - if (pr->from < 0) + if (pr->page < 0) break; KUNIT_ASSERT_GE(test, pr->to, pr->from); KUNIT_ASSERT_LE(test, pr->to, bufsize); @@ -97,13 +148,12 @@ static void __init iov_kunit_load_kvec(struct kunit *t= est, */ static void __init iov_kunit_copy_to_kvec(struct kunit *test) { - const struct kvec_test_range *pr; struct iov_iter iter; struct page **spages, **bpages; struct kvec kvec[8]; u8 *scratch, *buffer; size_t bufsize, npages, size, copied; - int i, patt; + int i; =20 bufsize =3D 0x100000; npages =3D bufsize / PAGE_SIZE; @@ -125,20 +175,8 @@ static void __init iov_kunit_copy_to_kvec(struct kunit= *test) KUNIT_EXPECT_EQ(test, iter.count, 0); KUNIT_EXPECT_EQ(test, iter.nr_segs, 0); =20 - /* Build the expected image in the scratch buffer. */ - patt =3D 0; - memset(scratch, 0, bufsize); - for (pr =3D kvec_test_ranges; pr->from >=3D 0; pr++) - for (i =3D pr->from; i < pr->to; i++) - scratch[i] =3D pattern(patt++); - - /* Compare the images */ - for (i =3D 0; i < bufsize; i++) { - KUNIT_EXPECT_EQ_MSG(test, buffer[i], scratch[i], "at i=3D%x", i); - if (buffer[i] !=3D scratch[i]) - return; - } - + iov_kunit_build_to_reference_pattern(test, scratch, bufsize, kvec_test_ra= nges); + iov_kunit_check_pattern(test, buffer, scratch, bufsize); KUNIT_SUCCEED(); } =20 @@ -147,13 +185,12 @@ static void __init iov_kunit_copy_to_kvec(struct kuni= t *test) */ static void __init iov_kunit_copy_from_kvec(struct kunit *test) { - const struct kvec_test_range *pr; struct iov_iter iter; struct page **spages, **bpages; struct kvec kvec[8]; u8 *scratch, *buffer; size_t bufsize, npages, size, copied; - int i, j; + int i; =20 bufsize =3D 0x100000; npages =3D bufsize / PAGE_SIZE; @@ -175,25 +212,8 @@ static void __init iov_kunit_copy_from_kvec(struct kun= it *test) KUNIT_EXPECT_EQ(test, iter.count, 0); KUNIT_EXPECT_EQ(test, iter.nr_segs, 0); =20 - /* Build the expected image in the main buffer. */ - i =3D 0; - memset(buffer, 0, bufsize); - for (pr =3D kvec_test_ranges; pr->from >=3D 0; pr++) { - for (j =3D pr->from; j < pr->to; j++) { - buffer[i++] =3D pattern(j); - if (i >=3D bufsize) - goto stop; - } - } -stop: - - /* Compare the images */ - for (i =3D 0; i < bufsize; i++) { - KUNIT_EXPECT_EQ_MSG(test, scratch[i], buffer[i], "at i=3D%x", i); - if (scratch[i] !=3D buffer[i]) - return; - } - + iov_kunit_build_from_reference_pattern(test, buffer, bufsize, kvec_test_r= anges); + iov_kunit_check_pattern(test, buffer, scratch, bufsize); KUNIT_SUCCEED(); } =20 @@ -210,7 +230,7 @@ static const struct bvec_test_range bvec_test_ranges[] = =3D { { 5, 0x0000, 0x1000 }, { 6, 0x0000, 0x0ffb }, { 6, 0x0ffd, 0x0ffe }, - { -1, -1, -1 } + { -1 } }; =20 static void __init iov_kunit_load_bvec(struct kunit *test, @@ -225,7 +245,7 @@ static void __init iov_kunit_load_bvec(struct kunit *te= st, int i; =20 for (i =3D 0; i < bvmax; i++, pr++) { - if (pr->from < 0) + if (pr->page < 0) break; KUNIT_ASSERT_LT(test, pr->page, npages); KUNIT_ASSERT_LT(test, pr->page * PAGE_SIZE, bufsize); @@ -288,20 +308,14 @@ static void __init iov_kunit_copy_to_bvec(struct kuni= t *test) b =3D 0; patt =3D 0; memset(scratch, 0, bufsize); - for (pr =3D bvec_test_ranges; pr->from >=3D 0; pr++, b++) { + for (pr =3D bvec_test_ranges; pr->page >=3D 0; pr++, b++) { u8 *p =3D scratch + pr->page * PAGE_SIZE; =20 for (i =3D pr->from; i < pr->to; i++) p[i] =3D pattern(patt++); } =20 - /* Compare the images */ - for (i =3D 0; i < bufsize; i++) { - KUNIT_EXPECT_EQ_MSG(test, buffer[i], scratch[i], "at i=3D%x", i); - if (buffer[i] !=3D scratch[i]) - return; - } - + iov_kunit_check_pattern(test, buffer, scratch, bufsize); KUNIT_SUCCEED(); } =20 @@ -341,7 +355,7 @@ static void __init iov_kunit_copy_from_bvec(struct kuni= t *test) /* Build the expected image in the main buffer. */ i =3D 0; memset(buffer, 0, bufsize); - for (pr =3D bvec_test_ranges; pr->from >=3D 0; pr++) { + for (pr =3D bvec_test_ranges; pr->page >=3D 0; pr++) { size_t patt =3D pr->page * PAGE_SIZE; =20 for (j =3D pr->from; j < pr->to; j++) { @@ -352,13 +366,7 @@ static void __init iov_kunit_copy_from_bvec(struct kun= it *test) } stop: =20 - /* Compare the images */ - for (i =3D 0; i < bufsize; i++) { - KUNIT_EXPECT_EQ_MSG(test, scratch[i], buffer[i], "at i=3D%x", i); - if (scratch[i] !=3D buffer[i]) - return; - } - + iov_kunit_check_pattern(test, buffer, scratch, bufsize); KUNIT_SUCCEED(); } =20 @@ -409,7 +417,7 @@ static void __init iov_kunit_copy_to_xarray(struct kuni= t *test) struct page **spages, **bpages; u8 *scratch, *buffer; size_t bufsize, npages, size, copied; - int i, patt; + int i; =20 bufsize =3D 0x100000; npages =3D bufsize / PAGE_SIZE; @@ -426,7 +434,7 @@ static void __init iov_kunit_copy_to_xarray(struct kuni= t *test) iov_kunit_load_xarray(test, &iter, READ, xarray, bpages, npages); =20 i =3D 0; - for (pr =3D kvec_test_ranges; pr->from >=3D 0; pr++) { + for (pr =3D kvec_test_ranges; pr->page >=3D 0; pr++) { size =3D pr->to - pr->from; KUNIT_ASSERT_LE(test, pr->to, bufsize); =20 @@ -439,20 +447,8 @@ static void __init iov_kunit_copy_to_xarray(struct kun= it *test) i +=3D size; } =20 - /* Build the expected image in the scratch buffer. */ - patt =3D 0; - memset(scratch, 0, bufsize); - for (pr =3D kvec_test_ranges; pr->from >=3D 0; pr++) - for (i =3D pr->from; i < pr->to; i++) - scratch[i] =3D pattern(patt++); - - /* Compare the images */ - for (i =3D 0; i < bufsize; i++) { - KUNIT_EXPECT_EQ_MSG(test, buffer[i], scratch[i], "at i=3D%x", i); - if (buffer[i] !=3D scratch[i]) - return; - } - + iov_kunit_build_to_reference_pattern(test, scratch, bufsize, kvec_test_ra= nges); + iov_kunit_check_pattern(test, buffer, scratch, bufsize); KUNIT_SUCCEED(); } =20 @@ -467,7 +463,7 @@ static void __init iov_kunit_copy_from_xarray(struct ku= nit *test) struct page **spages, **bpages; u8 *scratch, *buffer; size_t bufsize, npages, size, copied; - int i, j; + int i; =20 bufsize =3D 0x100000; npages =3D bufsize / PAGE_SIZE; @@ -484,7 +480,7 @@ static void __init iov_kunit_copy_from_xarray(struct ku= nit *test) iov_kunit_load_xarray(test, &iter, READ, xarray, bpages, npages); =20 i =3D 0; - for (pr =3D kvec_test_ranges; pr->from >=3D 0; pr++) { + for (pr =3D kvec_test_ranges; pr->page >=3D 0; pr++) { size =3D pr->to - pr->from; KUNIT_ASSERT_LE(test, pr->to, bufsize); =20 @@ -497,25 +493,8 @@ static void __init iov_kunit_copy_from_xarray(struct k= unit *test) i +=3D size; } =20 - /* Build the expected image in the main buffer. */ - i =3D 0; - memset(buffer, 0, bufsize); - for (pr =3D kvec_test_ranges; pr->from >=3D 0; pr++) { - for (j =3D pr->from; j < pr->to; j++) { - buffer[i++] =3D pattern(j); - if (i >=3D bufsize) - goto stop; - } - } -stop: - - /* Compare the images */ - for (i =3D 0; i < bufsize; i++) { - KUNIT_EXPECT_EQ_MSG(test, scratch[i], buffer[i], "at i=3D%x", i); - if (scratch[i] !=3D buffer[i]) - return; - } - + iov_kunit_build_from_reference_pattern(test, buffer, bufsize, kvec_test_r= anges); + iov_kunit_check_pattern(test, buffer, scratch, bufsize); KUNIT_SUCCEED(); } =20 @@ -573,7 +552,7 @@ static void __init iov_kunit_extract_pages_kvec(struct = kunit *test) while (from =3D=3D pr->to) { pr++; from =3D pr->from; - if (from < 0) + if (pr->page < 0) goto stop; } ix =3D from / PAGE_SIZE; @@ -651,7 +630,7 @@ static void __init iov_kunit_extract_pages_bvec(struct = kunit *test) while (from =3D=3D pr->to) { pr++; from =3D pr->from; - if (from < 0) + if (pr->page < 0) goto stop; } ix =3D pr->page + from / PAGE_SIZE; @@ -698,7 +677,7 @@ static void __init iov_kunit_extract_pages_xarray(struc= t kunit *test) iov_kunit_create_buffer(test, &bpages, npages); iov_kunit_load_xarray(test, &iter, READ, xarray, bpages, npages); =20 - for (pr =3D kvec_test_ranges; pr->from >=3D 0; pr++) { + for (pr =3D kvec_test_ranges; pr->page >=3D 0; pr++) { from =3D pr->from; size =3D pr->to - from; KUNIT_ASSERT_LE(test, pr->to, bufsize);