linux-kernel - [PATCH v2 5/7] agp/nvidia: Declare value returned by readl() as unused

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Message-Id: <20211201114645.15384-6-tzimmermann@suse.de>
Date:   Wed,  1 Dec 2021 12:46:43 +0100
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     airlied@...ux.ie, daniel.vetter@...ll.ch, arnd@...db.de,
        gregkh@...uxfoundation.org, James.Bottomley@...senPartnership.com,
        deller@....de
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Thomas Zimmermann <tzimmermann@...e.de>
Subject: [PATCH v2 5/7] agp/nvidia: Declare value returned by readl() as unused

Fix the compiler warning

  drivers/char/agp/nvidia-agp.c: In function 'nvidia_tlbflush':
  drivers/char/agp/nvidia-agp.c:264:22: warning: variable 'temp' set but not used [-Wunused-but-set-variable]
    264 |         u32 wbc_reg, temp;

by marking the temp variable with __maybe_unused. The affected readl()
is only required for flushing caches, but the returned value is not of
interest.

v2:
	* declare temp as __maybe_unused (Helge)

Signed-off-by: Thomas Zimmermann <tzimmermann@...e.de>
---
 drivers/char/agp/nvidia-agp.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/char/agp/nvidia-agp.c b/drivers/char/agp/nvidia-agp.c
index f78e756157db..826dbd06f6bb 100644
--- a/drivers/char/agp/nvidia-agp.c
+++ b/drivers/char/agp/nvidia-agp.c
@@ -261,7 +261,8 @@ static int nvidia_remove_memory(struct agp_memory *mem, off_t pg_start, int type
 static void nvidia_tlbflush(struct agp_memory *mem)
 {
 	unsigned long end;
-	u32 wbc_reg, temp;
+	u32 wbc_reg;
+	u32 __maybe_unused temp;
 	int i;
 
 	/* flush chipset */
-- 
2.34.0