lib/test_vmalloc.c: allow built-in execution

Remove 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

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Uladzislau Rezki (Sony) <[email protected]>
Reviewed-by: Baoquan He <[email protected]>
Reviewed-by: Adrian Huang <[email protected]>
Tested-by: Adrian Huang <[email protected]>
Cc: Christop Hellwig <[email protected]>
Cc: Mateusz Guzik <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

1 files changed, 3 insertions, 2 deletions

diff --git a/lib/test_vmalloc.c b/lib/test_vmalloc.c
index 399751022eea..1b0b59549aaf 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)