* [PATCH] validation: add check for typeof() and address spaces
@ 2025-10-28 13:32 Dan Carpenter
2025-12-01 15:24 ` Chris Li
0 siblings, 1 reply; 2+ messages in thread
From: Dan Carpenter @ 2025-10-28 13:32 UTC (permalink / raw)
To: Chris Li, Uros Bizjak; +Cc: Sparse Mailing-list
The typeof() key word should preserve the address space and
typeof_unqual() should not. Add a check to verify this works as
expected.
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
---
validation/typeof-as.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
create mode 100644 validation/typeof-as.c
diff --git a/validation/typeof-as.c b/validation/typeof-as.c
new file mode 100644
index 000000000000..563685281d92
--- /dev/null
+++ b/validation/typeof-as.c
@@ -0,0 +1,32 @@
+#define __seg_gs __attribute__((address_space(__seg_gs)))
+static int __seg_gs m;
+
+static int __seg_gs bad_manual (void)
+{
+ return (*(int *)&m);
+}
+
+static int __seg_gs good_manual (void)
+{
+ return (*(int __seg_gs *)&m);
+}
+
+static int bad_typeof (void)
+{
+ return (*(typeof_unqual(m) *)&m);
+}
+
+static int __seg_gs good_typeof (void)
+{
+ return (*(volatile typeof(m) *)&m);
+}
+
+/*
+ * check-name: typeof address space
+ * check-command: ./sparse typeof-as.c
+ *
+ * check-error-start
+typeof-as.c:6:19: warning: cast removes address space '__seg_gs' of expression
+typeof-as.c:16:19: warning: cast removes address space '__seg_gs' of expression
+ * check-error-end
+ */
--
2.51.0
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [PATCH] validation: add check for typeof() and address spaces
2025-10-28 13:32 [PATCH] validation: add check for typeof() and address spaces Dan Carpenter
@ 2025-12-01 15:24 ` Chris Li
0 siblings, 0 replies; 2+ messages in thread
From: Chris Li @ 2025-12-01 15:24 UTC (permalink / raw)
To: Dan Carpenter; +Cc: Uros Bizjak, Sparse Mailing-list
On Tue, Oct 28, 2025 at 5:32 PM Dan Carpenter <dan.carpenter@linaro.org> wrote:
>
> The typeof() key word should preserve the address space and
> typeof_unqual() should not. Add a check to verify this works as
> expected.
>
> Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Applied to sparse-dev.
Chris
> ---
> validation/typeof-as.c | 32 ++++++++++++++++++++++++++++++++
> 1 file changed, 32 insertions(+)
> create mode 100644 validation/typeof-as.c
>
> diff --git a/validation/typeof-as.c b/validation/typeof-as.c
> new file mode 100644
> index 000000000000..563685281d92
> --- /dev/null
> +++ b/validation/typeof-as.c
> @@ -0,0 +1,32 @@
> +#define __seg_gs __attribute__((address_space(__seg_gs)))
> +static int __seg_gs m;
> +
> +static int __seg_gs bad_manual (void)
> +{
> + return (*(int *)&m);
> +}
> +
> +static int __seg_gs good_manual (void)
> +{
> + return (*(int __seg_gs *)&m);
> +}
> +
> +static int bad_typeof (void)
> +{
> + return (*(typeof_unqual(m) *)&m);
> +}
> +
> +static int __seg_gs good_typeof (void)
> +{
> + return (*(volatile typeof(m) *)&m);
> +}
> +
> +/*
> + * check-name: typeof address space
> + * check-command: ./sparse typeof-as.c
> + *
> + * check-error-start
> +typeof-as.c:6:19: warning: cast removes address space '__seg_gs' of expression
> +typeof-as.c:16:19: warning: cast removes address space '__seg_gs' of expression
> + * check-error-end
> + */
> --
> 2.51.0
>
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