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scx_utils: clarify error about missing CONFIG_DEBUG_INFO_BTF

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If CONFIG_DEBUG_INFO_BTF is not enabled in the kernel, the C schedulers
report the following error via libbpf, clearly indicating the missing
kernel config:

 libbpf: kernel BTF is missing at '/sys/kernel/btf/vmlinux', was CONFIG_DEBUG_INFO_BTF enabled?

In contrast, the Rust schedulers report a less clear error:

 thread 'main' panicked at /home/arighi/src/scx/rust/scx_utils/src/compat.rs:23:9:
 btf__load_vmlinux_btf() returned NULL
 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Make sure to report a similar error, so that users have a better clue
about the missing kernel config. After this change the error looks like
the following:

 thread 'main' panicked at /home/arighi/src/scx/rust/scx_utils/src/compat.rs:23:9:
 btf__load_vmlinux_btf() returned NULL, was CONFIG_DEBUG_INFO_BTF enabled?

Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
This commit is contained in:
Andrea Righi 2024-06-27 09:00:31 +02:00
parent 8537c1b474
commit a7965abdbc
1 changed files with 1 additions and 1 deletions
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2
rust/scx_utils/src/compat.rs
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@ -20,7 +20,7 @@ lazy_static::lazy_static! {
fn load_vmlinux_btf() -> &'static mut btf {
let btf = unsafe { btf__load_vmlinux_btf() };
if btf.is_null() {
panic!("btf__load_vmlinux_btf() returned NULL");
panic!("btf__load_vmlinux_btf() returned NULL, was CONFIG_DEBUG_INFO_BTF enabled?")
}
unsafe { &mut *btf }
}