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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 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.2 X-Rspamd-Queue-Id: 494C240020 X-Rspam-User: X-Rspamd-Server: rspam04 X-Stat-Signature: redkny33hu3u4m5pogpn9zw8rm5nxexz X-HE-Tag: 1700063407-896925 X-HE-Meta: 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 /HMCz1Pm 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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"); struct kvec_test_range { - int from, to; + int page, from, to; }; static const struct kvec_test_range kvec_test_ranges[] = { - { 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 } }; @@ -69,6 +69,57 @@ static void *__init iov_kunit_create_buffer(struct kunit *test, return buffer; } +/* + * 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 *scratch, + size_t bufsize, + const struct kvec_test_range *pr) +{ + int i, patt = 0; + + memset(scratch, 0, bufsize); + for (; pr->page >= 0; pr++) + for (i = pr->from; i < pr->to; i++) + scratch[i] = pattern(patt++); +} + +/* + * Build the reference pattern in the iterator buffer that we expect to see 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 = 0, j; + + memset(buffer, 0, bufsize); + for (; pr->page >= 0; pr++) { + for (j = pr->from; j < pr->to; j++) { + buffer[i++] = pattern(j); + if (i >= 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 = 0; i < bufsize; i++) { + KUNIT_EXPECT_EQ_MSG(test, buffer[i], scratch[i], "at i=%x", i); + if (buffer[i] != 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 *test, int i; for (i = 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 *test, */ 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; bufsize = 0x100000; npages = 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); - /* Build the expected image in the scratch buffer. */ - patt = 0; - memset(scratch, 0, bufsize); - for (pr = kvec_test_ranges; pr->from >= 0; pr++) - for (i = pr->from; i < pr->to; i++) - scratch[i] = pattern(patt++); - - /* Compare the images */ - for (i = 0; i < bufsize; i++) { - KUNIT_EXPECT_EQ_MSG(test, buffer[i], scratch[i], "at i=%x", i); - if (buffer[i] != scratch[i]) - return; - } - + iov_kunit_build_to_reference_pattern(test, scratch, bufsize, kvec_test_ranges); + iov_kunit_check_pattern(test, buffer, scratch, bufsize); KUNIT_SUCCEED(); } @@ -147,13 +185,12 @@ static void __init iov_kunit_copy_to_kvec(struct kunit *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; bufsize = 0x100000; npages = bufsize / PAGE_SIZE; @@ -175,25 +212,8 @@ static void __init iov_kunit_copy_from_kvec(struct kunit *test) KUNIT_EXPECT_EQ(test, iter.count, 0); KUNIT_EXPECT_EQ(test, iter.nr_segs, 0); - /* Build the expected image in the main buffer. */ - i = 0; - memset(buffer, 0, bufsize); - for (pr = kvec_test_ranges; pr->from >= 0; pr++) { - for (j = pr->from; j < pr->to; j++) { - buffer[i++] = pattern(j); - if (i >= bufsize) - goto stop; - } - } -stop: - - /* Compare the images */ - for (i = 0; i < bufsize; i++) { - KUNIT_EXPECT_EQ_MSG(test, scratch[i], buffer[i], "at i=%x", i); - if (scratch[i] != buffer[i]) - return; - } - + iov_kunit_build_from_reference_pattern(test, buffer, bufsize, kvec_test_ranges); + iov_kunit_check_pattern(test, buffer, scratch, bufsize); KUNIT_SUCCEED(); } @@ -210,7 +230,7 @@ static const struct bvec_test_range bvec_test_ranges[] = { { 5, 0x0000, 0x1000 }, { 6, 0x0000, 0x0ffb }, { 6, 0x0ffd, 0x0ffe }, - { -1, -1, -1 } + { -1 } }; static void __init iov_kunit_load_bvec(struct kunit *test, @@ -225,7 +245,7 @@ static void __init iov_kunit_load_bvec(struct kunit *test, int i; for (i = 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 kunit *test) b = 0; patt = 0; memset(scratch, 0, bufsize); - for (pr = bvec_test_ranges; pr->from >= 0; pr++, b++) { + for (pr = bvec_test_ranges; pr->page >= 0; pr++, b++) { u8 *p = scratch + pr->page * PAGE_SIZE; for (i = pr->from; i < pr->to; i++) p[i] = pattern(patt++); } - /* Compare the images */ - for (i = 0; i < bufsize; i++) { - KUNIT_EXPECT_EQ_MSG(test, buffer[i], scratch[i], "at i=%x", i); - if (buffer[i] != scratch[i]) - return; - } - + iov_kunit_check_pattern(test, buffer, scratch, bufsize); KUNIT_SUCCEED(); } @@ -341,7 +355,7 @@ static void __init iov_kunit_copy_from_bvec(struct kunit *test) /* Build the expected image in the main buffer. */ i = 0; memset(buffer, 0, bufsize); - for (pr = bvec_test_ranges; pr->from >= 0; pr++) { + for (pr = bvec_test_ranges; pr->page >= 0; pr++) { size_t patt = pr->page * PAGE_SIZE; for (j = pr->from; j < pr->to; j++) { @@ -352,13 +366,7 @@ static void __init iov_kunit_copy_from_bvec(struct kunit *test) } stop: - /* Compare the images */ - for (i = 0; i < bufsize; i++) { - KUNIT_EXPECT_EQ_MSG(test, scratch[i], buffer[i], "at i=%x", i); - if (scratch[i] != buffer[i]) - return; - } - + iov_kunit_check_pattern(test, buffer, scratch, bufsize); KUNIT_SUCCEED(); } @@ -409,7 +417,7 @@ static void __init iov_kunit_copy_to_xarray(struct kunit *test) struct page **spages, **bpages; u8 *scratch, *buffer; size_t bufsize, npages, size, copied; - int i, patt; + int i; bufsize = 0x100000; npages = bufsize / PAGE_SIZE; @@ -426,7 +434,7 @@ static void __init iov_kunit_copy_to_xarray(struct kunit *test) iov_kunit_load_xarray(test, &iter, READ, xarray, bpages, npages); i = 0; - for (pr = kvec_test_ranges; pr->from >= 0; pr++) { + for (pr = kvec_test_ranges; pr->page >= 0; pr++) { size = pr->to - pr->from; KUNIT_ASSERT_LE(test, pr->to, bufsize); @@ -439,20 +447,8 @@ static void __init iov_kunit_copy_to_xarray(struct kunit *test) i += size; } - /* Build the expected image in the scratch buffer. */ - patt = 0; - memset(scratch, 0, bufsize); - for (pr = kvec_test_ranges; pr->from >= 0; pr++) - for (i = pr->from; i < pr->to; i++) - scratch[i] = pattern(patt++); - - /* Compare the images */ - for (i = 0; i < bufsize; i++) { - KUNIT_EXPECT_EQ_MSG(test, buffer[i], scratch[i], "at i=%x", i); - if (buffer[i] != scratch[i]) - return; - } - + iov_kunit_build_to_reference_pattern(test, scratch, bufsize, kvec_test_ranges); + iov_kunit_check_pattern(test, buffer, scratch, bufsize); KUNIT_SUCCEED(); } @@ -467,7 +463,7 @@ static void __init iov_kunit_copy_from_xarray(struct kunit *test) struct page **spages, **bpages; u8 *scratch, *buffer; size_t bufsize, npages, size, copied; - int i, j; + int i; bufsize = 0x100000; npages = bufsize / PAGE_SIZE; @@ -484,7 +480,7 @@ static void __init iov_kunit_copy_from_xarray(struct kunit *test) iov_kunit_load_xarray(test, &iter, READ, xarray, bpages, npages); i = 0; - for (pr = kvec_test_ranges; pr->from >= 0; pr++) { + for (pr = kvec_test_ranges; pr->page >= 0; pr++) { size = pr->to - pr->from; KUNIT_ASSERT_LE(test, pr->to, bufsize); @@ -497,25 +493,8 @@ static void __init iov_kunit_copy_from_xarray(struct kunit *test) i += size; } - /* Build the expected image in the main buffer. */ - i = 0; - memset(buffer, 0, bufsize); - for (pr = kvec_test_ranges; pr->from >= 0; pr++) { - for (j = pr->from; j < pr->to; j++) { - buffer[i++] = pattern(j); - if (i >= bufsize) - goto stop; - } - } -stop: - - /* Compare the images */ - for (i = 0; i < bufsize; i++) { - KUNIT_EXPECT_EQ_MSG(test, scratch[i], buffer[i], "at i=%x", i); - if (scratch[i] != buffer[i]) - return; - } - + iov_kunit_build_from_reference_pattern(test, buffer, bufsize, kvec_test_ranges); + iov_kunit_check_pattern(test, buffer, scratch, bufsize); KUNIT_SUCCEED(); } @@ -573,7 +552,7 @@ static void __init iov_kunit_extract_pages_kvec(struct kunit *test) while (from == pr->to) { pr++; from = pr->from; - if (from < 0) + if (pr->page < 0) goto stop; } ix = from / PAGE_SIZE; @@ -651,7 +630,7 @@ static void __init iov_kunit_extract_pages_bvec(struct kunit *test) while (from == pr->to) { pr++; from = pr->from; - if (from < 0) + if (pr->page < 0) goto stop; } ix = pr->page + from / PAGE_SIZE; @@ -698,7 +677,7 @@ static void __init iov_kunit_extract_pages_xarray(struct kunit *test) iov_kunit_create_buffer(test, &bpages, npages); iov_kunit_load_xarray(test, &iter, READ, xarray, bpages, npages); - for (pr = kvec_test_ranges; pr->from >= 0; pr++) { + for (pr = kvec_test_ranges; pr->page >= 0; pr++) { from = pr->from; size = pr->to - from; KUNIT_ASSERT_LE(test, pr->to, bufsize);