linux-kernel - Re: [PATCH v2 2/2] of: Add unit tests for applying overlays

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Date:   Tue, 25 Apr 2017 11:44:36 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     Frank Rowand <frowand.list@...il.com>
Cc:     Stephen Boyd <stephen.boyd@...aro.org>,
        Michal Marek <mmarek@...e.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] of: Add unit tests for applying overlays

On Mon, Apr 24, 2017 at 6:05 PM,  <frowand.list@...il.com> wrote:
> From: Frank Rowand <frank.rowand@...y.com>
>
> Existing overlay unit tests examine individual pieces of the overlay
> code.  The new tests target the entire process of applying an overlay.

Just a few nits.

> Signed-off-by: Frank Rowand <frank.rowand@...y.com>

[...]

> diff --git a/drivers/of/of_private.h b/drivers/of/of_private.h
> index 18bbb4517e25..cc76b3b81eab 100644
> --- a/drivers/of/of_private.h
> +++ b/drivers/of/of_private.h
> @@ -55,6 +55,17 @@ static inline int of_property_notify(int action, struct device_node *np,
>  }
>  #endif /* CONFIG_OF_DYNAMIC */
>
> +#ifdef CONFIG_OF_UNITTEST
> +extern void __init unittest_unflatten_overlay_base(void);
> +extern void *__unflatten_device_tree(const void *blob,

This can and should be outside the ifdef.

> +                             struct device_node *dad,
> +                             struct device_node **mynodes,
> +                             void *(*dt_alloc)(u64 size, u64 align),
> +                             bool detached);
> +#else
> +static inline void unittest_unflatten_overlay_base(void) {};
> +#endif
> +
>  /**
>   * General utilities for working with live trees.
>   *

[...]

> diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
> index 62db55b97c10..884f6c1f8ae9 100644
> --- a/drivers/of/unittest.c
> +++ b/drivers/of/unittest.c
> @@ -8,6 +8,7 @@
>  #include <linux/err.h>
>  #include <linux/errno.h>
>  #include <linux/hashtable.h>
> +#include <linux/libfdt.h>
>  #include <linux/of.h>
>  #include <linux/of_fdt.h>
>  #include <linux/of_irq.h>
> @@ -1925,6 +1926,320 @@ static void __init of_unittest_overlay(void)
>  static inline void __init of_unittest_overlay(void) { }
>  #endif
>
> +#ifdef CONFIG_OF_OVERLAY

This can move down to...

> +
> +/*
> + * __dtb_ot_begin[] and __dtb_ot_end[] are created by cmd_dt_S_dtb
> + * in scripts/Makefile.lib
> + */
> +
> +#define OVERLAY_INFO_EXTERN(name) \
> +       extern uint8_t __dtb_##name##_begin[]; \
> +       extern uint8_t __dtb_##name##_end[]
> +
> +#define OVERLAY_INFO(name, expected) \
> +{      .dtb_begin       = __dtb_##name##_begin, \
> +       .dtb_end         = __dtb_##name##_end, \
> +       .expected_result = expected, \
> +}
> +
> +struct overlay_info {
> +       uint8_t            *dtb_begin;
> +       uint8_t            *dtb_end;
> +       void               *data;
> +       struct device_node *np_overlay;
> +       int                expected_result;
> +       int                overlay_id;
> +};
> +
> +OVERLAY_INFO_EXTERN(overlay_base);
> +OVERLAY_INFO_EXTERN(overlay);
> +OVERLAY_INFO_EXTERN(overlay_bad_phandle);

...here. Maybe we want to move all this to a separate file instead.

> +
> +/* order of entries is hard-coded into users of overlays[] */
> +struct overlay_info overlays[] = {

static?

> +       OVERLAY_INFO(overlay_base, -9999),
> +       OVERLAY_INFO(overlay, 0),
> +       OVERLAY_INFO(overlay_bad_phandle, -EINVAL),
> +       {}
> +};

[...]

> @@ -1962,6 +2277,9 @@ static int __init of_unittest(void)
>         /* Double check linkage after removing testcase data */
>         of_unittest_check_tree_linkage();
>
> +

Extra blank line.

> +       of_unittest_overlay_high_level();
> +
>         pr_info("end of unittest - %i passed, %i failed\n",
>                 unittest_results.passed, unittest_results.failed);
>
> --
> Frank Rowand <frank.rowand@...y.com>
>