Re: [PATCH bpf-next v2] bpf: handle MADV_PAGEOUT error in uprobe_multi.c

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On Mon, Oct 21, 2024 at 3:41 PM Jiri Olsa <olsajiri@xxxxxxxxx> wrote:
>
> On Mon, Oct 21, 2024 at 01:07:06PM +0800, Jason Xing wrote:
> > From: Jason Xing <kernelxing@xxxxxxxxxxx>
> >
> > When I compiled the tools/testing/selftests/bpf, the following error
> > pops out:
> > uprobe_multi.c: In function ‘trigger_uprobe’:
> > uprobe_multi.c:109:26: error: ‘MADV_PAGEOUT’ undeclared (first use in this function); did you mean ‘MADV_RANDOM’?
> >    madvise(addr, page_sz, MADV_PAGEOUT);
> >                           ^~~~~~~~~~~~
> >                           MADV_RANDOM
> >
> > Including the <linux/linux/mman.h> header file solves this compilation error.
>
> hi,
> strange, uprobe_multi.c even has:
>
> #ifndef MADV_PAGEOUT
> #define MADV_PAGEOUT 21
> #endif
>
> and '#include <sys/mman.h>' should be all that's needed
>
> could you please share more details (extra flags) on how you compile?

OMG, thanks for reminding me. The net-next branch that I compiled
doesn't have those three lines. Now I can see them in bpf-next. So I
think the issue has been fixed already :)





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