Messages in this thread | | | Date | Wed, 26 Aug 2015 11:41:11 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH v2 0/6] perf: Introduce extended syscall error reporting |
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On Wed, 26 Aug 2015 09:26:56 +0200 Ingo Molnar <mingo@kernel.org> wrote:
> > * Ingo Molnar <mingo@kernel.org> wrote: > > > ... but back then I didn't feel like complicating an error recovery ABI for the > > needs of the 1%, robust error handling is all about simplicity: if it's not > > simple, tools won't use it. > > And note that it needs to be 'simple' in two places for usage to grow naturally: > > - the usage site in the kernel > - the tooling side that recovers the information. > > That's why I think that such a form: > > return err_str(-EINVAL, "x86/perf: CPU does not support precise sampling"); > > is obviously simple on the kernel side as it returns -EINVAL, and is very simple > on the tooling side as well, if we are allowed to extend prctl(). >
Is this whole thing overkill? As far as I can see, the problem which is being addressed only occurs in a couple of places (perf, wifi netlink handling) and could be addressed with some local pr_debug statements. ie,
#define err_str(e, s) ({ if (debugging) pr_debug("%s:%d: error %d (%s)", __FILE__, __LINE__, e, s); e; })
(And I suppose that if this is later deemed inadequate, err_str() could be made more fancy).
IOW, do we really need some grand kernel-wide infrastructural thing to adequately address this problem?
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