Hello! On 6/1/2017 12:19 AM, Jeff Kirsher wrote:
From: Tony Nguyen <anthony.l.ngu...@intel.com> The following warning is now shown as a result of new checks added for gcc 7: drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c: In function ‘ixgbevf_open’: drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c:1363:13: warning: ‘%d’ directive output may be truncated writing between 1 and 10 bytes into a region of size between 3 and 18 [-Wformat-truncation=] "%s-%s-%d", netdev->name, "TxRx", ri++); ^~ drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c:1363:6: note: directive argument in the range [0, 2147483647] "%s-%s-%d", netdev->name, "TxRx", ri++); ^~~~~~~~~~ drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c:1362:4: note: ‘snprintf’ output between 8 and 32 bytes into a destination of size 24 snprintf(q_vector->name, sizeof(q_vector->name) - 1, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ "%s-%s-%d", netdev->name, "TxRx", ri++); ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Resolve this warning by making a couple of changes. - Don't reserve space for the null terminator. Since snprintf adds the null terminator automatically, there is no need for us to reserve a byte for it. - Change a couple variables that can never be negative from int to unsigned int. While we're making changes to the format string, move the constant strings into the format string instead of providing them as specifiers.
I suspect that trick saved some data space due to using the identical (and so merged) format strings...
Signed-off-by: Tony Nguyen <anthony.l.ngu...@intel.com> Tested-by: Andrew Bowers <andrewx.bow...@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirs...@intel.com>
[...] MBR, Sergei