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Kernel functions that are not inlined can be easily hooked with BPF for tracing. However, functions intended for tracing may still be inlined unexpectedly. For example, in our case, after upgrading the compiler from GCC 9 to GCC 11, the tcp_drop_reason() function was inlined, which broke our monitoring tools. To prevent this, we need to ensure that the function remains non-inlined. The noinline_for_tracing annotation is introduced as a general solution for preventing inlining of kernel functions that need to be traced. This approach avoids the need for adding individual noinline comments to each function and provides a more consistent way to maintain traceability. Link: https://lore.kernel.org/netdev/CANn89iKvr44ipuRYFaPTpzwz=B_+pgA94jsggQ946mjwreV6Aw@mail.gmail.com/ Suggested-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Yafang Shao <laoar.shao@gmail.com> Link: https://patch.msgid.link/20241024093742.87681-2-laoar.shao@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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| acpi | ||
| asm-generic | ||
| clocksource | ||
| crypto | ||
| cxl | ||
| drm | ||
| dt-bindings | ||
| keys | ||
| kunit | ||
| kvm | ||
| linux | ||
| math-emu | ||
| media | ||
| memory | ||
| misc | ||
| net | ||
| pcmcia | ||
| ras | ||
| rdma | ||
| rv | ||
| scsi | ||
| soc | ||
| sound | ||
| target | ||
| trace | ||
| uapi | ||
| ufs | ||
| vdso | ||
| video | ||
| xen | ||