svn commit: r326314 - in head/sys: ddb kern sys

[Alexey Dokuchaev]

On Wed, Nov 29, 2017 at 04:04:49AM +1100, Bruce Evans wrote:
> On Tue, 28 Nov 2017, Edward Tomasz Napierala wrote:
> > Log:
> >  Make kdb_reenter() silent when explicitly called from db_error().
> >  This removes the useless backtrace on various ddb(4) user errors.
> >
> >  Reviewed by:	jhb@
> >  Obtained from:	CheriBSD
> >  MFC after:	2 weeks
> >  Sponsored by:	DARPA, AFRL
> >  Differential Revision:	https://reviews.freebsd.org/D13212
> 
> This doesn't fix the spam for user errors that cause a trap, which are
> very common (for mistyping memory addresses).  ddb sets up trap handlers
> using setjmp, and actually does this correctly in many cases, but when
> a trap occurs the error handling is: [...]
> 
> I use the following fix of disabling the spam in all cases (unless reenabled
> in all cases using ddb): [...]

Since someone is hacking on subr_kdb.c, may I ask them to commit attached
small patch?  I want to do some work in that area, and these style issues
bug me.

./danfe
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