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From:   Randy Dunlap <rdunlap@infradead.org>
To:     linux-kernel@vger.kernel.org
Cc:     Randy Dunlap <rdunlap@infradead.org>,
        Jaswinder Singh <jassisinghbrar@gmail.com>,
        Jaswinder Singh <jassi.brar@samsung.com>,
        Boojin Kim <boojin.kim@samsung.com>,
        Krzysztof Kozlowski <krzk@kernel.org>,
        Russell King <rmk+kernel@arm.linux.org.uk>,
        Vinod Koul <vkoul@kernel.org>, dmaengine@vger.kernel.org,
        linux-riscv@lists.infradead.org
Subject: [PATCH] dmaengine: pl330: rename _start to prevent build error
Date:   Mon, 22 May 2023 17:06:06 -0700
Message-Id: <20230523000606.9405-1-rdunlap@infradead.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

"_start" is used in several arches and proably should be reserved
for ARCH usage. Using it in a driver for a private symbol can cause
a build error when it conflicts with ARCH usage of the same symbol.

Therefore rename pl330's "_start" to "_start_thread" so that there
is no conflict and no build error.

drivers/dma/pl330.c:1053:13: error: '_start' redeclared as different kind of symbol
 1053 | static bool _start(struct pl330_thread *thrd)
      |             ^~~~~~
In file included from ../include/linux/interrupt.h:21,
                 from ../drivers/dma/pl330.c:18:
arch/riscv/include/asm/sections.h:11:13: note: previous declaration of '_start' with type 'char[]'
   11 | extern char _start[];
      |             ^~~~~~

Fixes: b7d861d93945 ("DMA: PL330: Merge PL330 driver into drivers/dma/")
Fixes: ae43b3289186 ("ARM: 8202/1: dmaengine: pl330: Add runtime Power Management support v12")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Jaswinder Singh <jassisinghbrar@gmail.com>
Cc: Jaswinder Singh <jassi.brar@samsung.com>
Cc: Boojin Kim <boojin.kim@samsung.com>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Vinod Koul <vkoul@kernel.org>
Cc: dmaengine@vger.kernel.org
Cc: linux-riscv@lists.infradead.org
---
 drivers/dma/pl330.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff -- a/drivers/dma/pl330.c b/drivers/dma/pl330.c
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -1050,7 +1050,7 @@ static bool _trigger(struct pl330_thread
 	return true;
 }
 
-static bool _start(struct pl330_thread *thrd)
+static bool _start_thread(struct pl330_thread *thrd)
 {
 	switch (_state(thrd)) {
 	case PL330_STATE_FAULT_COMPLETING:
@@ -1702,7 +1702,7 @@ static int pl330_update(struct pl330_dma
 			thrd->req_running = -1;
 
 			/* Get going again ASAP */
-			_start(thrd);
+			_start_thread(thrd);
 
 			/* For now, just make a list of callbacks to be done */
 			list_add_tail(&descdone->rqd, &pl330->req_done);
@@ -2089,7 +2089,7 @@ static void pl330_tasklet(struct tasklet
 	} else {
 		/* Make sure the PL330 Channel thread is active */
 		spin_lock(&pch->thread->dmac->lock);
-		_start(pch->thread);
+		_start_thread(pch->thread);
 		spin_unlock(&pch->thread->dmac->lock);
 	}
 
@@ -2107,7 +2107,7 @@ static void pl330_tasklet(struct tasklet
 			if (power_down) {
 				pch->active = true;
 				spin_lock(&pch->thread->dmac->lock);
-				_start(pch->thread);
+				_start_thread(pch->thread);
 				spin_unlock(&pch->thread->dmac->lock);
 				power_down = false;
 			}