[PATCH 7/7] Skip the entry if the sys_func field is NULL

[Denys Vlasenko]

On 02/06/2012 04:43 PM, H.J. Lu wrote:
> On Mon, Feb 6, 2012 at 7:24 AM, Dmitry V. Levin<ldv at altlinux.org>  wrote:
>> Hi,
>>
>> On Fri, Feb 03, 2012 at 10:19:55AM -0800, H.J. Lu wrote:
>>> Hi,
>>>
>>> This patch avoids segfault when there are holes in system call table.
>>> It can happen with syscall (number, ...) and number is in those holes.
>>
>> We don't have sysent tables with holes yet, do we?
>
> I am working on such a target, x32.

How many holes are in its syscall table?

Even though the performance hit of checking sysent[scno].sys_func != NULL
is small, I would prefer to not take it, by ensuring that
all sysent[i].sys_func are non-NULL.

Currently, only ia64 and mips have largish gaps in syscall numbers.
They simply added lots of

         { MA,   0,      printargs,              "SYS_926"       }, /* 926 */
         { MA,   0,      printargs,              "SYS_927"       }, /* 927 */
         { MA,   0,      printargs,              "SYS_928"       }, /* 928 */
         { MA,   0,      printargs,              "SYS_929"       }, /* 929 */

lines to fill them. Can x32 do the same?

-- 
vda