From: Michael Olbrich <m.olbrich@pengutronix.de>
To: ptxdist@pengutronix.de
Cc: Roland Hieber <rhi@pengutronix.de>
Subject: Re: [ptxdist] [APPLIED] doc: add section about kconfig diffs
Date: Fri, 7 May 2021 08:07:08 +0200 [thread overview]
Message-ID: <20210507060708.3947345-1-m.olbrich@pengutronix.de> (raw)
In-Reply-To: <20210427083030.7632-1-rhi@pengutronix.de>
Thanks, applied as 2b3d8affa79e8b5603c6cfe31d195e1ef5672a9f.
Michael
[sent from post-receive hook]
On Fri, 07 May 2021 08:07:08 +0200, Roland Hieber <rhi@pengutronix.de> wrote:
> Signed-off-by: Roland Hieber <rhi@pengutronix.de>
>
> Message-Id: <20210427083030.7632-1-rhi@pengutronix.de>
> Signed-off-by: Michael Olbrich <m.olbrich@pengutronix.de>
>
> diff --git a/doc/dev_kconfig_diffs.rst b/doc/dev_kconfig_diffs.rst
> new file mode 100644
> index 000000000000..5673bd2d2dd6
> --- /dev/null
> +++ b/doc/dev_kconfig_diffs.rst
> @@ -0,0 +1,79 @@
> +.. _kconfig-diffs:
> +
> +Kconfig Diffs
> +-------------
> +
> +For packages using Kconfig as their configuration system, PTXdist can generate
> +their config file from another *reference config file* and a *Kconfig diff* on
> +the fly.
> +This mechanism can be used to build configuration variants of a kernel or
> +barebox package.
> +For example, a "debug" kernel package can refer to the config file of the
> +"production" kernel as its reference config file, and its Kconfig diff then
> +only contains the Kconfig symbols that were changed in the "debug" variant:
> +
> ++-----------------------------------+-------------------------------------+-----------------------------------+
> +| release config symbol | debug kconfig diff | resulting debug config symbol |
> ++===================================+=====================================+===================================+
> +| CONFIG_LOCALVERSION="release" | CONFIG_LOCALVERSION="debug" | CONFIG_LOCALVERSION="debug" |
> ++-----------------------------------+-------------------------------------+-----------------------------------+
> +| # CONFIG_ARCH_MULTI_V6 is not set | | # CONFIG_ARCH_MULTI_V6 is not set |
> ++-----------------------------------+-------------------------------------+-----------------------------------+
> +| CONFIG_ARCH_MULTI_V7=y | | CONFIG_ARCH_MULTI_V7=y |
> ++-----------------------------------+-------------------------------------+-----------------------------------+
> +| # CONFIG_CGROUP_DEBUG is not set | CONFIG_CGROUP_DEBUG=y | CONFIG_CGROUP_DEBUG=y |
> ++-----------------------------------+-------------------------------------+-----------------------------------+
> +| # CONFIG_DEBUG_PREEMPT is not set | CONFIG_DEBUG_PREEMPT=y | CONFIG_DEBUG_PREEMPT=y |
> ++-----------------------------------+-------------------------------------+-----------------------------------+
> +| CONFIG_WATCHDOG=y | # CONFIG_WATCHDOG is not set | # CONFIG_WATCHDOG is not set |
> ++-----------------------------------+-------------------------------------+-----------------------------------+
> +| CONFIG_WATCHDOG_CORE=y | # CONFIG_WATCHDOG_CORE is undefined | |
> ++-----------------------------------+-------------------------------------+-----------------------------------+
> +| CONFIG_BCM2835_WDT=y | # CONFIG_BCM2835_WDT is undefined | |
> ++-----------------------------------+-------------------------------------+-----------------------------------+
> +
> +Kconfig does not write symbols to the config file that have unfulfilled dependencies (e.g., in the
> +above example ``CONFIG_WATCHDOG_CORE`` and ``CONFIG_BCM2835_WDT`` depend on ``CONFIG_WATCHDOG``).
> +Those symbols that are not present in the resulting debug config file are represented as ``… is
> +undefined`` in the diff.
> +
> +The first line of the Kconfig diff file contains the MD5 sum of the reference config file.
> +PTXdist uses this checksum to detect when the reference config has changed,
> +in which case the diff needs to be regenerated from the package's config file,
> +and to make sure that the diff is applicable to the reference config.
> +
> +Using Kconfig diffs
> +~~~~~~~~~~~~~~~~~~~
> +
> +The main part is setting the ``<PKG>_REF_CONFIG`` variable of a package to the reference config
> +file, for example::
> +
> + # rules/kernel.make:
> + KERNEL_CONFIG := $(call ptx/in-platformconfigdir, kernelconfig-release)
> +
> +::
> +
> + # rules/kernel-debug.make:
> + KERNEL_DEBUG_CONFIG := $(call ptx/in-platformconfigdir, kernelconfig-debug)
> + KERNEL_DEBUG_REF_CONFIG := $(call ptx/in-platformconfigdir, kernelconfig-release)
> +
> +PTXdist will now automatically generate ``kernelconfig-debug`` from ``kernelconfig-release`` and
> +``kernelconfig-debug.diff`` whenever doing and *oldconfig* or *menuconfig* on the *kernel-debug*
> +package.
> +If any symbols were changed by that operation, both the ``kernelconfig-debug.diff`` and the
> +``kernelconfig-debug`` are updated afterwards.
> +
> +Kconfig diffs and layers
> +~~~~~~~~~~~~~~~~~~~~~~~~
> +
> +PTXdist uses the same diff mechanism whenever the config file of a Kconfig-style package is changed
> +in an inherited layer (see :ref:`layers-in-ptxdist`).
> +In that case, the diff is calculated between the package's config file in the base layer and the
> +package's (adapted) config file in the current layer.
> +
> +.. note::
> + When using both ``<PKG>_REF_CONFIG`` and inter-layer Kconfig diffs, the inter-layer diff takes
> + precedence, and the reference config file in the inherited layer is ignored.
> + In the following example, arrows represent the config diff relation:
> +
> + .. image:: dev_kconfig_diffs_layer_precedence.svg
> diff --git a/doc/dev_kconfig_diffs_layer_precedence.svg b/doc/dev_kconfig_diffs_layer_precedence.svg
> new file mode 100644
> index 000000000000..babd0db3fd6d
> --- /dev/null
> +++ b/doc/dev_kconfig_diffs_layer_precedence.svg
> @@ -0,0 +1,315 @@
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> + </g>
> + <g
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> + </g>
> + </g>
> + <text
> + xml:space="preserve"
> + style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:4.23333px;line-height:1.2;font-family:'Roboto Slab';-inkscape-font-specification:'Roboto Slab, Normal';font-variant-ligatures:discretionary-ligatures;font-variant-position:super;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal;text-decoration:none;text-decoration-line:none;text-decoration-color:#000000;letter-spacing:-0.0185208px;word-spacing:0px;writing-mode:lr-tb;fill:#000000;fill-rule:evenodd;stroke-width:0.2;stroke-dasharray:1.2, 1.2;stop-color:#000000"
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> + y="118.56184"
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> + id="tspan845"
> + x="52.98016"
> + y="118.56184"
> + style="stroke-width:0.2" /></text>
> + <path
> + style="font-variation-settings:normal;opacity:1;vector-effect:none;fill:none;fill-opacity:1;fill-rule:evenodd;stroke:#000000;stroke-width:0.529167;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:2.11667, 2.11667;stroke-dashoffset:0;stroke-opacity:1;stop-color:#000000;stop-opacity:1"
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> diff --git a/doc/dev_layers_in_ptxdist.rst b/doc/dev_layers_in_ptxdist.rst
> index ec92c8c8a86c..a1066396ca28 100644
> --- a/doc/dev_layers_in_ptxdist.rst
> +++ b/doc/dev_layers_in_ptxdist.rst
> @@ -98,7 +98,8 @@ Packages with kconfig Based Config Files
>
> For packages such as the Linux kernel that have kconfig based config files,
> a lot of the infrastructure to handle config files and deltas across
> -multiple layers can be reused. Consistency validation is done implicitly
> +multiple layers can be reused (see :ref:`kconfig-diffs`).
> +Consistency validation is done implicitly
> and ``menuconfig`` and other kconfig commands will use config files and
> deltas as expected.
>
> diff --git a/doc/dev_manual.rst b/doc/dev_manual.rst
> index 03a05a661a97..c232cc91428a 100644
> --- a/doc/dev_manual.rst
> +++ b/doc/dev_manual.rst
> @@ -14,4 +14,5 @@ This chapter shows all (or most) of the details of how PTXdist works.
> dev_add_bin_only_files
> dev_create_new_pkg_templates
> dev_layers_in_ptxdist
> + dev_kconfig_diffs
> dev_code_signing
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prev parent reply other threads:[~2021-05-07 6:08 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-26 21:59 [ptxdist] [PATCH] " Roland Hieber
2021-04-27 8:30 ` [ptxdist] [PATCH v2] " Roland Hieber
2021-04-27 11:49 ` Roland Hieber
2021-05-07 6:42 ` [ptxdist] [PATCH] ptxd_make_world_package_info: improve rev config handling when layers are involved Michael Olbrich
2021-05-07 6:07 ` Michael Olbrich [this message]
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