Re: [PATCH 4/9v2] usb: host: ehci.h: fix single statement macros

From: Sergei Shtylyov
Date: Thu Dec 10 2015 - 06:55:43 EST


Hello.

On 12/10/2015 1:32 AM, Geyslan G. Bem wrote:

Don't use the 'do {} while (0)' wrapper in a single statement macro.

Caught by checkpatch: "WARNING: Single statement macros should not
use a do {} while (0) loop"

Signed-off-by: Geyslan G. Bem <geyslan@xxxxxxxxx>
---
drivers/usb/host/ehci.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index cfeebd8..945000a 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -244,9 +244,9 @@ struct ehci_hcd { /* one per controller */
/* irq statistics */
#ifdef EHCI_STATS
struct ehci_stats stats;
-# define COUNT(x) do { (x)++; } while (0)
+# define COUNT(x) ((x)++)
#else
-# define COUNT(x) do {} while (0)
+# define COUNT(x) ((void) 0)

Why not just empty #define?

[...]

MBR, Sergei

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