[PATCH] mlxsw: core: mlxsw: core: avoid -Wint-in-bool-context warning

[PATCH] mlxsw: core: mlxsw: core: avoid -Wint-in-bool-context warning

[Arnd Bergmann]

A recently added function in mlxsw triggers a harmless compiler warning:

In file included from drivers/net/ethernet/mellanox/mlxsw/core.h:17,
                 from drivers/net/ethernet/mellanox/mlxsw/core_env.c:7:
drivers/net/ethernet/mellanox/mlxsw/core_env.c: In function 'mlxsw_env_module_temp_thresholds_get':
drivers/net/ethernet/mellanox/mlxsw/reg.h:8015:45: error: '*' in boolean context, suggest '&&' instead [-Werror=int-in-bool-context]
 #define MLXSW_REG_MTMP_TEMP_TO_MC(val) (val * 125)
                                        ~~~~~^~~~~~
drivers/net/ethernet/mellanox/mlxsw/core_env.c:116:8: note: in expansion of macro 'MLXSW_REG_MTMP_TEMP_TO_MC'
   if (!MLXSW_REG_MTMP_TEMP_TO_MC(module_temp)) {
        ^~~~~~~~~~~~~~~~~~~~~~~~~

The warning is normally disabled, but it would be nice to enable
it to find real bugs, and there are no other known instances at
the moment.

Replace the negation with a zero-comparison, which also matches
the comment above it.

Fixes: d93c19a1d95c ("mlxsw: core: Add API for QSFP module temperature thresholds reading")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/net/ethernet/mellanox/mlxsw/core_env.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_env.c b/drivers/net/ethernet/mellanox/mlxsw/core_env.c
index 7a15e932ed2f..c1c1965d7acc 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core_env.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core_env.c
@@ -113,7 +113,7 @@ int mlxsw_env_module_temp_thresholds_get(struct mlxsw_core *core, int module,
 		return 0;
 	default:
 		/* Do not consider thresholds for zero temperature. */
-		if (!MLXSW_REG_MTMP_TEMP_TO_MC(module_temp)) {
+		if (MLXSW_REG_MTMP_TEMP_TO_MC(module_temp) == 0) {
 			*temp = 0;
 			return 0;
 		}
-- 
2.20.0

Re: [PATCH] mlxsw: core: mlxsw: core: avoid -Wint-in-bool-context warning

[Jiri Pirko]

Mon, Mar 18, 2019 at 05:35:11PM CET, arnd@arndb.de wrote:
>A recently added function in mlxsw triggers a harmless compiler warning:
>
>In file included from drivers/net/ethernet/mellanox/mlxsw/core.h:17,
>                 from drivers/net/ethernet/mellanox/mlxsw/core_env.c:7:
>drivers/net/ethernet/mellanox/mlxsw/core_env.c: In function 'mlxsw_env_module_temp_thresholds_get':
>drivers/net/ethernet/mellanox/mlxsw/reg.h:8015:45: error: '*' in boolean context, suggest '&&' instead [-Werror=int-in-bool-context]
> #define MLXSW_REG_MTMP_TEMP_TO_MC(val) (val * 125)
>                                        ~~~~~^~~~~~
>drivers/net/ethernet/mellanox/mlxsw/core_env.c:116:8: note: in expansion of macro 'MLXSW_REG_MTMP_TEMP_TO_MC'
>   if (!MLXSW_REG_MTMP_TEMP_TO_MC(module_temp)) {
>        ^~~~~~~~~~~~~~~~~~~~~~~~~
>
>The warning is normally disabled, but it would be nice to enable
>it to find real bugs, and there are no other known instances at
>the moment.
>
>Replace the negation with a zero-comparison, which also matches
>the comment above it.
>
>Fixes: d93c19a1d95c ("mlxsw: core: Add API for QSFP module temperature thresholds reading")
>Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Acked-by: Jiri Pirko <jiri@mellanox.com>

Re: [PATCH] mlxsw: core: mlxsw: core: avoid -Wint-in-bool-context warning

[David Miller]

From: Arnd Bergmann <arnd@arndb.de>
Date: Mon, 18 Mar 2019 17:35:11 +0100

> A recently added function in mlxsw triggers a harmless compiler warning:
> 
> In file included from drivers/net/ethernet/mellanox/mlxsw/core.h:17,
>                  from drivers/net/ethernet/mellanox/mlxsw/core_env.c:7:
> drivers/net/ethernet/mellanox/mlxsw/core_env.c: In function 'mlxsw_env_module_temp_thresholds_get':
> drivers/net/ethernet/mellanox/mlxsw/reg.h:8015:45: error: '*' in boolean context, suggest '&&' instead [-Werror=int-in-bool-context]
>  #define MLXSW_REG_MTMP_TEMP_TO_MC(val) (val * 125)
>                                         ~~~~~^~~~~~
> drivers/net/ethernet/mellanox/mlxsw/core_env.c:116:8: note: in expansion of macro 'MLXSW_REG_MTMP_TEMP_TO_MC'
>    if (!MLXSW_REG_MTMP_TEMP_TO_MC(module_temp)) {
>         ^~~~~~~~~~~~~~~~~~~~~~~~~
> 
> The warning is normally disabled, but it would be nice to enable
> it to find real bugs, and there are no other known instances at
> the moment.
> 
> Replace the negation with a zero-comparison, which also matches
> the comment above it.
> 
> Fixes: d93c19a1d95c ("mlxsw: core: Add API for QSFP module temperature thresholds reading")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Applied, thanks Arnd.