linux-kernel - [PATCH] lib/Kconfig.debug: TEST_IOV

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Date: Thu,  8 Feb 2024 07:30:10 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org,
	Guenter Roeck <linux@...ck-us.net>,
	David Howells <dhowells@...hat.com>
Subject: [PATCH] lib/Kconfig.debug: TEST_IOV_ITER depends on MMU

Trying to run the iov_iter unit test on a nommu system such as the qemu
kc705-nommu emulation results in a crash.

    KTAP version 1
    # Subtest: iov_iter
    # module: kunit_iov_iter
    1..9
BUG: failure at mm/nommu.c:318/vmap()!
Kernel panic - not syncing: BUG!

The test calls vmap() directly, but vmap() is not supported on nommu
systems, causing the crash. TEST_IOV_ITER therefore needs to depend
on MMU.

Fixes: 2d71340ff1d4 ("iov_iter: Kunit tests for copying to/from an iterator")
Cc: David Howells <dhowells@...hat.com>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 lib/Kconfig.debug | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 975a07f9f1cc..ef36b829ae1f 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -2235,6 +2235,7 @@ config TEST_DIV64
 config TEST_IOV_ITER
 	tristate "Test iov_iter operation" if !KUNIT_ALL_TESTS
 	depends on KUNIT
+	depends on MMU
 	default KUNIT_ALL_TESTS
 	help
 	  Enable this to turn on testing of the operation of the I/O iterator
-- 
2.39.2