netdev - [RFC PATCH v2 4/9] iov_iter: Consolidate bvec pattern checking

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Date: Wed, 20 Sep 2023 14:03:55 +0100
From: David Howells <dhowells@...hat.com>
To: Jens Axboe <axboe@...nel.dk>
Cc: David Howells <dhowells@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Christoph Hellwig <hch@....de>,
	Christian Brauner <christian@...uner.io>,
	David Laight <David.Laight@...LAB.COM>,
	Matthew Wilcox <willy@...radead.org>,
	Brendan Higgins <brendanhiggins@...gle.com>,
	David Gow <davidgow@...gle.com>,
	linux-fsdevel@...r.kernel.org,
	linux-block@...r.kernel.org,
	linux-mm@...ck.org,
	netdev@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	kunit-dev@...glegroups.com,
	linux-kernel@...r.kernel.org,
	Christian Brauner <brauner@...nel.org>,
	David Hildenbrand <david@...hat.com>,
	John Hubbard <jhubbard@...dia.com>
Subject: [RFC PATCH v2 4/9] iov_iter: Consolidate bvec pattern checking

Make the BVEC-testing functions use the consolidated pattern checking
functions to reduce the amount of duplicated code.

Signed-off-by: David Howells <dhowells@...hat.com>
cc: Christoph Hellwig <hch@....de>
cc: Christian Brauner <brauner@...nel.org>
cc: Jens Axboe <axboe@...nel.dk>
cc: Al Viro <viro@...iv.linux.org.uk>
cc: David Hildenbrand <david@...hat.com>
cc: John Hubbard <jhubbard@...dia.com>
cc: Brendan Higgins <brendanhiggins@...gle.com>
cc: David Gow <davidgow@...gle.com>
cc: linux-kselftest@...r.kernel.org
cc: kunit-dev@...glegroups.com
cc: linux-mm@...ck.org
cc: linux-fsdevel@...r.kernel.org
---
 lib/kunit_iov_iter.c | 42 +++++++++++-------------------------------
 1 file changed, 11 insertions(+), 31 deletions(-)

diff --git a/lib/kunit_iov_iter.c b/lib/kunit_iov_iter.c
index 4925ca37cde6..eb86371b67d0 100644
--- a/lib/kunit_iov_iter.c
+++ b/lib/kunit_iov_iter.c
@@ -107,9 +107,11 @@ static void iov_kunit_build_to_reference_pattern(struct kunit *test, u8 *scratch
 	int i, patt = 0;
 
 	memset(scratch, 0, bufsize);
-	for (; pr->page >= 0; pr++)
+	for (; pr->page >= 0; pr++) {
+		u8 *p = scratch + pr->page * PAGE_SIZE;
 		for (i = pr->from; i < pr->to; i++)
-			scratch[i] = pattern(patt++);
+			p[i] = pattern(patt++);
+	}
 }
 
 /*
@@ -124,8 +126,10 @@ static void iov_kunit_build_from_reference_pattern(struct kunit *test, u8 *buffe
 
 	memset(buffer, 0, bufsize);
 	for (; pr->page >= 0; pr++) {
+		size_t patt = pr->page * PAGE_SIZE;
+
 		for (j = pr->from; j < pr->to; j++) {
-			buffer[i++] = pattern(j);
+			buffer[i++] = pattern(patt + j);
 			if (i >= bufsize)
 				return;
 		}
@@ -287,13 +291,12 @@ static void __init iov_kunit_load_bvec(struct kunit *test,
  */
 static void __init iov_kunit_copy_to_bvec(struct kunit *test)
 {
-	const struct iov_kunit_range *pr;
 	struct iov_iter iter;
 	struct bio_vec bvec[8];
 	struct page **spages, **bpages;
 	u8 *scratch, *buffer;
 	size_t bufsize, npages, size, copied;
-	int i, patt;
+	int i;
 
 	bufsize = 0x100000;
 	npages = bufsize / PAGE_SIZE;
@@ -315,16 +318,7 @@ static void __init iov_kunit_copy_to_bvec(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 = bvec_test_ranges; pr->page >= 0; pr++) {
-		u8 *p = scratch + pr->page * PAGE_SIZE;
-
-		for (i = pr->from; i < pr->to; i++)
-			p[i] = pattern(patt++);
-	}
-
+	iov_kunit_build_to_reference_pattern(test, scratch, bufsize, bvec_test_ranges);
 	iov_kunit_check_pattern(test, buffer, scratch, bufsize);
 	KUNIT_SUCCEED();
 }
@@ -334,13 +328,12 @@ static void __init iov_kunit_copy_to_bvec(struct kunit *test)
  */
 static void __init iov_kunit_copy_from_bvec(struct kunit *test)
 {
-	const struct iov_kunit_range *pr;
 	struct iov_iter iter;
 	struct bio_vec bvec[8];
 	struct page **spages, **bpages;
 	u8 *scratch, *buffer;
 	size_t bufsize, npages, size, copied;
-	int i, j;
+	int i;
 
 	bufsize = 0x100000;
 	npages = bufsize / PAGE_SIZE;
@@ -362,20 +355,7 @@ static void __init iov_kunit_copy_from_bvec(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 = bvec_test_ranges; pr->page >= 0; pr++) {
-		size_t patt = pr->page * PAGE_SIZE;
-
-		for (j = pr->from; j < pr->to; j++) {
-			buffer[i++] = pattern(patt + j);
-			if (i >= bufsize)
-				goto stop;
-		}
-	}
-stop:
-
+	iov_kunit_build_from_reference_pattern(test, buffer, bufsize, bvec_test_ranges);
 	iov_kunit_check_pattern(test, buffer, scratch, bufsize);
 	KUNIT_SUCCEED();
 }