linux-kernel - [PATCH bpf-next v7 12/24] HID: Kconfig: split HID support and hid-core compilation

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Message-Id: <20220721153625.1282007-13-benjamin.tissoires@redhat.com>
Date:   Thu, 21 Jul 2022 17:36:13 +0200
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     Greg KH <gregkh@...uxfoundation.org>,
        Jiri Kosina <jikos@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Kumar Kartikeya Dwivedi <memxor@...il.com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, Shuah Khan <shuah@...nel.org>,
        Dave Marchevsky <davemarchevsky@...com>,
        Joe Stringer <joe@...ium.io>, Jonathan Corbet <corbet@....net>
Cc:     Tero Kristo <tero.kristo@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-doc@...r.kernel.org,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>
Subject: [PATCH bpf-next v7 12/24] HID: Kconfig: split HID support and hid-core compilation

Currently, we step into drivers/hid/ based on the value of
CONFIG_HID.

However, that value is a tristate, meaning that it can be a module.

As per the documentation, if we jump into the subdirectory by
following an obj-m, we can not compile anything inside that
subdirectory in vmlinux. It is considered as a bug.

To make things more friendly to HID-BPF, split HID (the HID core
parameter) from HID_SUPPORT (do we want any kind of HID support in the
system?), and make this new config a boolean.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>

---

new in v7
---
 drivers/Makefile    |  2 +-
 drivers/hid/Kconfig | 20 +++++++++++---------
 2 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/drivers/Makefile b/drivers/Makefile
index 9a30842b22c5..7832431aa173 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -137,7 +137,7 @@ obj-$(CONFIG_CRYPTO)		+= crypto/
 obj-$(CONFIG_SUPERH)		+= sh/
 obj-y				+= clocksource/
 obj-$(CONFIG_DCA)		+= dca/
-obj-$(CONFIG_HID)		+= hid/
+obj-$(CONFIG_HID_SUPPORT)	+= hid/
 obj-$(CONFIG_PPC_PS3)		+= ps3/
 obj-$(CONFIG_OF)		+= of/
 obj-$(CONFIG_SSB)		+= ssb/
diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 70da5931082f..9fa21583c709 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -2,12 +2,18 @@
 #
 # HID driver configuration
 #
-menu "HID support"
-     depends on INPUT
+menuconfig HID_SUPPORT
+	bool "HID bus support"
+	default y
+	depends on INPUT
+	help
+	  This option adds core support for human interface device (HID).
+	  You will also need drivers from the following menu to make use of it.
+
+if HID_SUPPORT
 
 config HID
-	tristate "HID bus support"
-	depends on INPUT
+	tristate "HID bus core support"
 	default y
 	help
 	  A human interface device (HID) is a type of computer device that
@@ -24,8 +30,6 @@ config HID
 
 	  If unsure, say Y.
 
-if HID
-
 config HID_BATTERY_STRENGTH
 	bool "Battery level reporting for HID devices"
 	depends on HID
@@ -1308,8 +1312,6 @@ config HID_MCP2221
 
 endmenu
 
-endif # HID
-
 source "drivers/hid/usbhid/Kconfig"
 
 source "drivers/hid/i2c-hid/Kconfig"
@@ -1320,4 +1322,4 @@ source "drivers/hid/amd-sfh-hid/Kconfig"
 
 source "drivers/hid/surface-hid/Kconfig"
 
-endmenu
+endif # HID_SUPPORT
-- 
2.36.1