Two new functions in bpf contain a cast from a 'u64' to a
pointer. This works on 64-bit architectures but causes a warning
on all 32-bit architectures:
kernel/trace/bpf_trace.c: In function 'bpf_perf_event_output_tp':
kernel/trace/bpf_trace.c:350:13: error: cast to pointer from integer of
different size [-Werror=int-to-pointer-cast]
u64 ctx = *(long *)r1;
This changes the cast to first convert the u64 argument into a uintptr_t,
which is guaranteed to be the same size as a pointer.
Signed-off-by: Arnd Bergmann <a...@arndb.de>
Fixes: 9940d67c93b5 ("bpf: support bpf_get_stackid() and
bpf_perf_event_output() in tracepoint programs")
---
kernel/trace/bpf_trace.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 413ec5614180..c082313a523a 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -347,7 +347,7 @@ static u64 bpf_perf_event_output_tp(u64 r1, u64 r2, u64
index, u64 r4, u64 size)
* from bpf program and contain a pointer to 'struct pt_regs'. Fetch it
* from there and call the same bpf_perf_event_output() helper
*/
- u64 ctx = *(long *)r1;
+ u64 ctx = *(long *)(uintptr_t)r1;
return bpf_perf_event_output(ctx, r2, index, r4, size);
}
@@ -365,7 +365,7 @@ static const struct bpf_func_proto
bpf_perf_event_output_proto_tp = {
static u64 bpf_get_stackid_tp(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5)
{
- u64 ctx = *(long *)r1;
+ u64 ctx = *(long *)(uintptr_t)r1;
return bpf_get_stackid(ctx, r2, r3, r4, r5);
}
--
2.7.0
