linux-kernel - [PATCH] clocksource: arc_timer: eliminate redefined macro error

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Date:   Wed, 22 Sep 2021 20:18:08 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Vineet Gupta <vgupta@...nel.org>,
        linux-snps-arc@...ts.infradead.org,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH] clocksource: arc_timer: eliminate redefined macro error

In drivers/clocksource/, 3 drivers use "TIMER_CTRL_IE" with 3 different
values.  Two of them (mps2-timer.c and timer-sp804.c/timer-sp.h) are
localized and left unmodifed.

One of them uses a shared header file (<soc/arc/timers.h>), which is
what is causing the "redefined" warnings, so change the macro name in
that driver only.

In file included from ../drivers/clocksource/timer-sp804.c:24:
../drivers/clocksource/timer-sp.h:25: error: "TIMER_CTRL_IE" redefined [-Werror]
   25 | #define TIMER_CTRL_IE           (1 << 5)        /*   VR */
../include/soc/arc/timers.h:20: note: this is the location of the previous definition
   20 | #define TIMER_CTRL_IE           (1 << 0) /* Interrupt when Count reaches limit */

Fixes: b26c2e3823ba ("ARC: breakout timer include code into separate header")
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Cc: Vineet Gupta <vgupta@...nel.org>
Cc: linux-snps-arc@...ts.infradead.org
Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
---
 drivers/clocksource/arc_timer.c |    2 +-
 include/soc/arc/timers.h        |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

--- linux-next-20210917.orig/include/soc/arc/timers.h
+++ linux-next-20210917/include/soc/arc/timers.h
@@ -17,7 +17,7 @@
 #define ARC_REG_TIMER1_CNT	0x100	/* timer 1 count */
 
 /* CTRL reg bits */
-#define TIMER_CTRL_IE	        (1 << 0) /* Interrupt when Count reaches limit */
+#define TIMER_CTRL_IEN	        (1 << 0) /* Interrupt when Count reaches limit */
 #define TIMER_CTRL_NH	        (1 << 1) /* Count only when CPU NOT halted */
 
 #define ARC_TIMERN_MAX		0xFFFFFFFF
--- linux-next-20210917.orig/drivers/clocksource/arc_timer.c
+++ linux-next-20210917/drivers/clocksource/arc_timer.c
@@ -245,7 +245,7 @@ static void arc_timer_event_setup(unsign
 	write_aux_reg(ARC_REG_TIMER0_LIMIT, cycles);
 	write_aux_reg(ARC_REG_TIMER0_CNT, 0);	/* start from 0 */
 
-	write_aux_reg(ARC_REG_TIMER0_CTRL, TIMER_CTRL_IE | TIMER_CTRL_NH);
+	write_aux_reg(ARC_REG_TIMER0_CTRL, TIMER_CTRL_IEN | TIMER_CTRL_NH);
 }