On Tue, Jun 13, 2017 at 11:55:26AM +0200, Charlemagne Lasse wrote:
Hi,
I have following code which generates a warning when compiling with "make C=1".
~~~~~~~ struct task_struct *kthread; kthread = kthread_create(xxxxx, yyyyy, "zzzzz"); if (IS_ERR(kthread)) { ~~~~~~~
The warning is
./include/linux/err.h:35:16: warning: dereference of noderef expression
And disappears when I remove the IS_ERR. How do I correctly work around this incorrect warning?
Btw. I am using Debian stretch amd64. It seems like this is related to the __force used in the parameter list of IS_ERR. Removing it also removes the warning.
The warning is indeed related to '__force' but it should be the other way around. Anyway, by just reading your three lines of code, you shouldn't receive this warning, with or without the __force.
If it is fixed in sparse's git then when will there be a new release of it?
I can't reproduce your problem even on a three years old version of sparse (more exactly git version d917662d5 of sparse, anything older has build problems with half-recent kernels). The pre-processed version of your file could be interesting as well as the output of the make command but with the 'V=1' option added. Regards, -- Luc Van Oostenryck