cxl: don't manipulate the mm.mm_users field directly

It is better to rely on the API provided by the MM layer instead of
directly manipulating the mm_users field.

Signed-off-by: Laurent Dufour <ldufour@linux.ibm.com>
Acked-by: Frederic Barrat <fbarrat@linux.ibm.com>
Acked-by: Andrew Donnellan <ajd@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210310174405.51044-1-ldufour@linux.ibm.com

diff --git a/drivers/misc/cxl/fault.c b/drivers/misc/cxl/fault.c
index 01153b7..60c8291 100644 (file)
--- a/drivers/misc/cxl/fault.c
+++ b/drivers/misc/cxl/fault.c
@@ -200,7 +200,7 @@ static struct mm_struct *get_mem_context(struct cxl_context *ctx)
        if (ctx->mm == NULL)
                return NULL;
 
-       if (!atomic_inc_not_zero(&ctx->mm->mm_users))
+       if (!mmget_not_zero(ctx->mm))
                return NULL;
 
        return ctx->mm;