Re: [RFC PATCH v2] checkpatch: add shebang check to EXECUTE_PERMISSIONS

[Joe Perches]

On Wed, 2020-10-14 at 09:17 +0200, Lukas Bulwahn wrote:
> $ clang-format-10 --version
> Ubuntu clang-format version 
> 10.0.1-++20200928083909+ef32c611aa2-1~exp1~20200928185400.194
> 
> $ clang-format-10 --help | grep 'dry-run'
>   --dry-run                  - If set, do not actually make the formatting 
> changes
>   --ferror-limit=<uint>      - Set the maximum number of clang-format
>     errors to emit before stopping (0 = no limit). Used only with --dry-run or -n
>   -n                         - Alias for --dry-run

OK, maybe so.

However I think the clang-format --dry-run output doesn't
currently contain particularly useful information.  Maybe
later versions are better than version 10.

For instance:

$ /usr/bin/clang-format-10 --version
clang-format version 10.0.0-4ubuntu1 

$ /usr/bin/clang-format-10 --dry-run drivers/net/ethernet/intel/igb/igb_main.c 2>&1 | head -25
drivers/net/ethernet/intel/igb/igb_main.c:54:40: warning: code should be clang-formatted [-Wclang-format-violations]
static const char igb_driver_string[] =
                                       ^
drivers/net/ethernet/intel/igb/igb_main.c:56:36: warning: code should be clang-formatted [-Wclang-format-violations]
static const char igb_copyright[] =
                                   ^
drivers/net/ethernet/intel/igb/igb_main.c:100:3: warning: code should be clang-formatted [-Wclang-format-violations]
        {0, }
         ^
drivers/net/ethernet/intel/igb/igb_main.c:100:5: warning: code should be clang-formatted [-Wclang-format-violations]
        {0, }
           ^
drivers/net/ethernet/intel/igb/igb_main.c:163:58: warning: code should be clang-formatted [-Wclang-format-violations]
static int igb_ndo_set_vf_vlan(struct net_device *netdev,
                                                         ^
drivers/net/ethernet/intel/igb/igb_main.c:164:28: warning: code should be clang-formatted [-Wclang-format-violations]
                               int vf, u16 vlan, u8 qos, __be16 vlan_proto);
                                                ^
drivers/net/ethernet/intel/igb/igb_main.c:189:50: warning: code should be clang-formatted [-Wclang-format-violations]
        SET_SYSTEM_SLEEP_PM_OPS(igb_suspend, igb_resume)
                                                        ^
drivers/net/ethernet/intel/igb/igb_main.c:190:21: warning: code should be clang-formatted [-Wclang-format-violations]
        SET_RUNTIME_PM_OPS(igb_runtime_suspend, igb_runtime_resume,
                           ^
drivers/net/ethernet/intel/igb/igb_main.c:190:61: warning: code should be clang-formatted [-Wclang-format-violations]

vs

$ ./scripts/checkpatch.pl -f drivers/net/ethernet/intel/igb/igb_main.c 2>&1 | head -25
WARNING: externs should be avoided in .c files
#113: FILE: drivers/net/ethernet/intel/igb/igb_main.c:113:
+int igb_open(struct net_device *);

WARNING: function definition argument 'struct net_device *' should also have an identifier name
#113: FILE: drivers/net/ethernet/intel/igb/igb_main.c:113:
+int igb_open(struct net_device *);

WARNING: externs should be avoided in .c files
#114: FILE: drivers/net/ethernet/intel/igb/igb_main.c:114:
+int igb_close(struct net_device *);

WARNING: function definition argument 'struct net_device *' should also have an identifier name
#114: FILE: drivers/net/ethernet/intel/igb/igb_main.c:114:
+int igb_close(struct net_device *);

CHECK: Alignment should match open parenthesis
#191: FILE: drivers/net/ethernet/intel/igb/igb_main.c:191:
+	SET_RUNTIME_PM_OPS(igb_runtime_suspend, igb_runtime_resume,
+			igb_runtime_idle)

CHECK: Please use a blank line after function/struct/union/enum declarations
#193: FILE: drivers/net/ethernet/intel/igb/igb_main.c:193:
+};
+static void igb_shutdown(struct pci_dev *);