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Message-Id: <20190227103726.15163-1-andriy.shevchenko@linux.intel.com> Date: Wed, 27 Feb 2019 13:37:26 +0300 From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com> To: "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com> Subject: [PATCH v1] net: dev: Use unsigned integer as an argument to left-shift 1 << 31 is Undefined Behaviour according to the C standard. Use U type modifier to avoid theoretical overflow. Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com> --- include/linux/netdevice.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 86dbb3e29139..848b54b7ec91 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -3861,7 +3861,7 @@ static inline u32 netif_msg_init(int debug_value, int default_msg_enable_bits) if (debug_value == 0) /* no output */ return 0; /* set low N bits */ - return (1 << debug_value) - 1; + return (1U << debug_value) - 1; } static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu) -- 2.20.1
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