linux-kernel - [PATCH 2/4] lib/test_vmalloc.c: Allow built-in execution

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Message-Id: <20250417161216.88318-2-urezki@gmail.com>
Date: Thu, 17 Apr 2025 18:12:14 +0200
From: "Uladzislau Rezki (Sony)" <urezki@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>,
	Baoquan He <bhe@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Uladzislau Rezki <urezki@...il.com>,
	Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>
Subject: [PATCH 2/4] lib/test_vmalloc.c: Allow built-in execution

This patch removes the dependency on module loading ("m")
for the vmalloc test suite, enabling it to be built directly
into the kernel, so both ("=m") and ("=y") are supported.

Motivation:
- Faster debugging/testing of vmalloc code;
- It allows to configure the test via kernel-boot parameters.

Configuration example:
  test_vmalloc.nr_threads=64
  test_vmalloc.run_test_mask=7
  test_vmalloc.sequential_test_order=1

Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
---
 lib/Kconfig.debug  | 3 +--
 lib/test_vmalloc.c | 5 +++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index f9051ab610d54..166b9d830a85a 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -2574,8 +2574,7 @@ config TEST_BITOPS
 config TEST_VMALLOC
 	tristate "Test module for stress/performance analysis of vmalloc allocator"
 	default n
-       depends on MMU
-	depends on m
+	depends on MMU
 	help
 	  This builds the "test_vmalloc" module that should be used for
 	  stress and performance analysis. So, any new change for vmalloc
diff --git a/lib/test_vmalloc.c b/lib/test_vmalloc.c
index 4ab23e5e772d0..6d65ef725d42c 100644
--- a/lib/test_vmalloc.c
+++ b/lib/test_vmalloc.c
@@ -591,10 +591,11 @@ static void do_concurrent_test(void)
 	kvfree(tdriver);
 }
 
-static int vmalloc_test_init(void)
+static int __init vmalloc_test_init(void)
 {
 	do_concurrent_test();
-	return -EAGAIN; /* Fail will directly unload the module */
+	/* Fail will directly unload the module */
+	return IS_BUILTIN(CONFIG_TEST_VMALLOC) ? 0:-EAGAIN;
 }
 
 module_init(vmalloc_test_init)
-- 
2.39.5