linux-kernel - [PATCH v2] dmaengine: pl330: rename

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Message-Id: <20230524045310.27923-1-rdunlap@infradead.org>
Date:   Tue, 23 May 2023 21:53:10 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Jaswinder Singh <jassisinghbrar@...il.com>,
        Boojin Kim <boojin.kim@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Russell King <rmk+kernel@....linux.org.uk>,
        Vinod Koul <vkoul@...nel.org>, dmaengine@...r.kernel.org,
        linux-riscv@...ts.infradead.org
Subject: [PATCH v2] dmaengine: pl330: rename _start to prevent build error

"_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 "pl330_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@...radead.org>
Cc: Jaswinder Singh <jassisinghbrar@...il.com>
Cc: Boojin Kim <boojin.kim@...sung.com>
Cc: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Russell King <rmk+kernel@....linux.org.uk>
Cc: Vinod Koul <vkoul@...nel.org>
Cc: dmaengine@...r.kernel.org
Cc: linux-riscv@...ts.infradead.org
---
v2: make new function name pl330-specific (Vinod)
    drop Jaswinder Singh @samsung.com from Cc: list

 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 pl330_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);
+			pl330_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);
+		pl330_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);
+				pl330_start_thread(pch->thread);
 				spin_unlock(&pch->thread->dmac->lock);
 				power_down = false;
 			}