On Fri, Apr 13, 2018 at 11:23:36AM -0700, Linus Torvalds wrote: > On Fri, Apr 13, 2018 at 10:54 AM, Russell King - ARM Linux > <li...@armlinux.org.uk> wrote: > > > > FPE_FLTINV means "floating point invalid operation". Does it really > > cover the case where hardware has failed, or is it intended to cover > > the case where userspace did something wrong and asked for an invalid > > operation from the FP hardware? > > Note that the number of people who actually look at the si_code is > approximately zero. > > But the ones that _do_ check the si_code are certainly not going to > check it against a new code that they don't know about. > > I suspect that if you start searching for FLT_xyz occurrences in code, > approximately 100% of them are from the kernel code that generates > them, not from any actual users. > > So I'd be very surprised if you can find *anybody* who cares about > that exact value (with the possible exceptions of test-suites). > > Sadly, google code-search is no more. It was useful for things like that.
I've found https://codesearch.debian.net/ useful for digging into this kind of question, though it tends to throw up a lot of false positives. Most uses I've seen do nothing more than use the FPE_xyz value to format diagnostic messages while dying. I struggled to find code that made a meaningful functional decision based on the value, though that's not proof... Cheers ---Dave
