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Date: Mon, 31 Oct 2022 12:03:15 +0000 From: David Laight <David.Laight@...LAB.COM> To: David Laight <David.Laight@...LAB.COM>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> CC: Jiri Olsa <jolsa@...nel.org> Subject: RE: Linux 6.1-rc3 build fail in include/linux/bpf.h 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)
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