On Thu, 2 Apr 2015 10:04:43 +0800 kbuild test robot <fengguang.wu@xxxxxxxxx> wrote:
> tree: git://git.cmpxchg.org/linux-mmotm.git master
> head: c226e49f30453de9c6d82b001a985254990b32e0
> commit: 3de343256baf44761d580e5bec367065d8f361f1 [481/507] prctl: avoid using mmap_sem for exe_file serialization
> reproduce:
> # apt-get install sparse
> git checkout 3de343256baf44761d580e5bec367065d8f361f1
> make ARCH=x86_64 allmodconfig
> make C=1 CF=-D__CHECK_ENDIAN__
>
>
> sparse warnings: (new ones prefixed by >>)
>
> kernel/sys.c:886:49: sparse: incorrect type in argument 2 (different modifiers)
> kernel/sys.c:886:49: expected unsigned long [nocast] [usertype] *ut
> kernel/sys.c:886:49: got unsigned long *<noident>
> kernel/sys.c:886:49: sparse: implicit cast to nocast type
> kernel/sys.c:886:59: sparse: incorrect type in argument 3 (different modifiers)
> kernel/sys.c:886:59: expected unsigned long [nocast] [usertype] *st
> kernel/sys.c:886:59: got unsigned long *<noident>
> kernel/sys.c:886:59: sparse: implicit cast to nocast type
>
> ...
>
> 1547 unsigned long maxrss = 0;
> 1548
> 1549 memset((char *)r, 0, sizeof (*r));
> 1550 utime = stime = 0;
> 1551
> 1552 if (who == RUSAGE_THREAD) {
> > 1553 task_cputime_adjusted(current, &utime, &stime);
> 1554 accumulate_thread_rusage(p, r);
> 1555 maxrss = p->signal->maxrss;
> 1556 goto out;
> 1557 }
The warnings seem bogus - everything is using cputime_t?
And I don't see how "prctl: avoid using mmap_sem for exe_file
serialization" could have caused this even if it is wrong.
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