@@ -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);
}
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 <arnd@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(-) -- 2.7.0