selftests/bpf: Fix uprobe_multi compilation error

When building selftests, the following was seen:

uprobe_multi.c: In function ‘trigger_uprobe’:
uprobe_multi.c:108:40: error: ‘MADV_PAGEOUT’ undeclared (first use in this function)
  108 |                 madvise(addr, page_sz, MADV_PAGEOUT);
      |                                        ^~~~~~~~~~~~
uprobe_multi.c:108:40: note: each undeclared identifier is reported only once for each function it appears in
make: *** [Makefile:850: bpf-next/tools/testing/selftests/bpf/uprobe_multi] Error 1

...even with updated UAPI headers. It seems the above value is
defined in UAPI <linux/mman.h> but including that file triggers
other redefinition errors.  Simplest solution is to add a
guarded definition, as was done for MADV_POPULATE_READ.

Fixes: 3c217a182018 ("selftests/bpf: add build ID tests")
Signed-off-by: Alan Maguire <[email protected]>
Signed-off-by: Andrii Nakryiko <[email protected]>
Acked-by: Eduard Zingerman <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]
Signed-off-by: Alexei Starovoitov <[email protected]>

0 files changed, 0 insertions, 0 deletions