Re: [Xen-devel] [Patch v2] common/initcall: Extern linker symbols with correct types.

[Keir Fraser <keir.xen@xxxxxxxxx>]

On 22/10/2013 17:34, "Andrew Cooper" <andrew.cooper3@xxxxxxxxxx> wrote:

> On 18/10/13 15:06, Andrew Cooper wrote:
>> Coverity IDs 1054956, 1054957
>> 
>> Coverity pointed out that we applying array operations based on an expression
>> which yielded singleton pointers.  The problem is actually that the externs
>> were typed incorrectly.
>> 
>> Correct the extern declaration to prevent straying into undefined behaviour,
>> and relying on the lenience of GCC to work.
>> 
>> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>> CC: Keir Fraser <keir@xxxxxxx>
>> CC: Jan Beulich <JBeulich@xxxxxxxx>
> 
> Ping?

Acked-by: Keir Fraser <keir@xxxxxxx>

>> 
>> ---
>> 
>> Changes in v2: apply const correctness as well.
>> ---
>>  xen/common/kernel.c |   11 ++++++-----
>>  1 file changed, 6 insertions(+), 5 deletions(-)
>> 
>> diff --git a/xen/common/kernel.c b/xen/common/kernel.c
>> index b8707d9..4ca50c4 100644
>> --- a/xen/common/kernel.c
>> +++ b/xen/common/kernel.c
>> @@ -196,19 +196,20 @@ void add_taint(unsigned flag)
>>      tainted |= flag;
>>  }
>>  
>> -extern initcall_t __initcall_start, __presmp_initcall_end, __initcall_end;
>> +extern const initcall_t __initcall_start[], __presmp_initcall_end[],
>> +    __initcall_end[];
>>  
>>  void __init do_presmp_initcalls(void)
>>  {
>> -    initcall_t *call;
>> -    for ( call = &__initcall_start; call < &__presmp_initcall_end; call++ )
>> +    const initcall_t *call;
>> +    for ( call = __initcall_start; call < __presmp_initcall_end; call++ )
>>          (*call)();
>>  }
>>  
>>  void __init do_initcalls(void)
>>  {
>> -    initcall_t *call;
>> -    for ( call = &__presmp_initcall_end; call < &__initcall_end; call++ )
>> +    const initcall_t *call;
>> +    for ( call = __presmp_initcall_end; call < __initcall_end; call++ )
>>          (*call)();
>>  }
>>  
> 



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