From: David Laight

Sent: 31 October 2022 11:15

The 6.1-rc3 sources fail to build because bpf.h unconditionally
#define BPF_DISPATCHER_ATTRIBUTES __attribute__((patchable_function_entry(5)))
for X86_64 builds.

I'm pretty sure that should depend on some other options
since the compiler isn't required to support it.
(The gcc 7.5.0 on my Ubunti 18.04 system certainly doesn't)

The only other reference to that attribute is in the definition
of 'notrace' in compiler.h.

I think patchable_function_entry was added in gcc 8.
Documentation/process/changes.rst gives the minimal gcc version for
building the kernel as 5.1.

I doubt a increasing it to 8 is acceptable.

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)