linux-kernel - [PATCH 1/4] amba: Export amba

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Date:   Tue, 8 May 2018 14:06:28 -0500
From:   Kim Phillips <kim.phillips@....com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Howells <dhowells@...hat.com>,
        Eric Auger <eric.auger@...hat.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        Gargi Sharma <gs051095@...il.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Kim Phillips <kim.phillips@....com>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        Rik van Riel <riel@...hat.com>,
        Robin Murphy <robin.murphy@....com>,
        Russell King <linux@...linux.org.uk>,
        Thierry Reding <treding@...dia.com>,
        Todd Kjos <tkjos@...gle.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] amba: Export amba_bustype

This patch is provided in the context of allowing the Coresight driver
subsystem to be loaded as modules.  Coresight uses amba_bus in its call
to bus_find_device() in of_coresight_get_endpoint_device() when
searching for a configurable endpoint device.  This patch allows
Coresight to reference amba_bustype when built as a module.

Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
Cc: Alex Williamson <alex.williamson@...hat.com>
Cc: Eric Auger <eric.auger@...hat.com>
Cc: Russell King <linux@...linux.org.uk>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Todd Kjos <tkjos@...gle.com>
Cc: Geert Uytterhoeven <geert+renesas@...der.be>
Cc: Thierry Reding <treding@...dia.com>
Cc: Robin Murphy <robin.murphy@....com>
Signed-off-by: Kim Phillips <kim.phillips@....com>
---
There was a prior patch submitted by Alex W. here:

https://lkml.org/lkml/2017/6/19/811

But I can't tell its fate - presume simply delayed?

Coresight uses amba_bus in its call to bus_find_device() here:

https://lxr.missinglinkelectronics.com/linux/drivers/hwtracing/coresight/of_coresight.c#L51

Grepping for bus_type and EXPORT shows other busses exporting their
type, so I don't think this is the wrong approach.  If, OTOH, Coresight
needs to do something differently, please comment.

 drivers/amba/bus.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
index 594c228d2f02..12283bd06733 100644
--- a/drivers/amba/bus.c
+++ b/drivers/amba/bus.c
@@ -197,6 +197,7 @@ struct bus_type amba_bustype = {
 	.pm		= &amba_pm,
 	.force_dma	= true,
 };
+EXPORT_SYMBOL_GPL(amba_bustype);
 
 static int __init amba_init(void)
 {
-- 
2.16.2