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kunit: test: Export kunit_attach_mm()

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Tests can allocate from virtual memory using kunit_vm_mmap(), which
transparently creates and attaches an mm_struct to the test runner if
one is not already attached. This is suitable for most cases, except for
when the code under test must access a task's mm before performing an
mmap. Expose kunit_attach_mm() as part of the interface for those
cases. This does not change the existing behavior.

Cc: David Gow <davidgow@google.com>
Signed-off-by: Tiffany Yang <ynaffit@google.com>
Reviewed-by: Carlos Llamas <cmllamas@google.com>
Link: https://lore.kernel.org/r/20250714185321.2417234-4-ynaffit@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tiffany Yang 2025-07-14 11:53:16 -07:00 committed by Greg Kroah-Hartman
parent 4328a52642
commit bdfa89c489
2 changed files with 14 additions and 2 deletions
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12
include/kunit/test.h
View File

@ -531,6 +531,18 @@ static inline char *kunit_kstrdup(struct kunit *test, const char *str, gfp_t gfp
*/
const char *kunit_kstrdup_const(struct kunit *test, const char *str, gfp_t gfp);
/**
* kunit_attach_mm() - Create and attach a new mm if it doesn't already exist.
*
* Allocates a &struct mm_struct and attaches it to @current. In most cases, call
* kunit_vm_mmap() without calling kunit_attach_mm() directly. Only necessary when
* code under test accesses the mm before executing the mmap (e.g., to perform
* additional initialization beforehand).
*
* Return: 0 on success, -errno on failure.
*/
int kunit_attach_mm(void);
/**
* kunit_vm_mmap() - Allocate KUnit-tracked vm_mmap() area
* @test: The test context object.

4
lib/kunit/user_alloc.c
View File

@ -22,8 +22,7 @@ struct kunit_vm_mmap_params {
unsigned long offset;
};
/* Create and attach a new mm if it doesn't already exist. */
static int kunit_attach_mm(void)
int kunit_attach_mm(void)
{
struct mm_struct *mm;
@ -49,6 +48,7 @@ static int kunit_attach_mm(void)
return 0;
}
EXPORT_SYMBOL_GPL(kunit_attach_mm);
static int kunit_vm_mmap_init(struct kunit_resource *res, void *context)
{