From: Murilo Opsfelder Araujo <muriloo@linux.ibm.com>
To: Joe Perches <joe@perches.com>
Cc: Christophe LEROY <christophe.leroy@c-s.fr>,
linux-kernel@vger.kernel.org,
"Alastair D'Silva" <alastair@d-silva.org>,
Andrew Donnellan <andrew.donnellan@au1.ibm.com>,
Balbir Singh <bsingharora@gmail.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Cyril Bur <cyrilbur@gmail.com>,
"Eric W . Biederman" <ebiederm@xmission.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Michael Neuling <mikey@neuling.org>,
Nicholas Piggin <npiggin@gmail.com>,
Paul Mackerras <paulus@samba.org>,
Simon Guo <wei.guo.simon@gmail.com>,
Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>,
"Tobin C . Harding" <me@tobin.cc>,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH v3 5/9] powerpc/traps: Print signal name for unhandled signals
Date: Wed, 1 Aug 2018 11:42:35 -0300 [thread overview]
Message-ID: <20180801144235.GA6022@kermit-br-ibm-com> (raw)
In-Reply-To: <afa25468e62ae3259878d8a95e9ac96f6be9f88a.camel@perches.com>
On Wed, Aug 01, 2018 at 12:03:50AM -0700, Joe Perches wrote:
> On Wed, 2018-08-01 at 08:37 +0200, Christophe LEROY wrote:
> > Le 31/07/2018 à 16:50, Murilo Opsfelder Araujo a écrit :
> > > This adds a human-readable name in the unhandled signal message.
> > > Before this patch, a page fault looked like:
> > > pandafault[6303]: unhandled signal 11 at 100007d0 nip 1000061c lr 7fff93c55100 code 2 in pandafault[10000000+10000]
> > > After this patch, a page fault looks like:
> > > pandafault[6352]: segfault (11) at 13a2a09f8 nip 13a2a086c lr 7fffb63e5100 code 2 in pandafault[13a2a0000+10000]
> ]]
> > > diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
> []
> > > @@ -96,6 +96,41 @@ EXPORT_SYMBOL(__debugger_fault_handler);
> > > #define TM_DEBUG(x...) do { } while(0)
> > > #endif
> > >
> > > +static const char *signames[SIGRTMIN + 1] = {
> > > + "UNKNOWN",
> > > + "SIGHUP", // 1
> > > + "SIGINT", // 2
> []
> > I don't think is is worth having that full table when we only use a few
> > of them. (As discussed in v1 https://patchwork.ozlabs.org/patch/948802/)
> >
> > I would suggest to instead use a function like this:
> >
> > static const char *signame(int signr)
> > {
> > if (signr == SIGBUS)
> > return "bus error";
> > if (signr == SIGFPE)
> > return "floating point exception";
> > if (signr == SIGILL)
> > return "illegal instruction";
> > if (signr == SIGILL)
> > return "segfault";
> > if (signr == SIGTRAP)
> > return "unhandled trap";
> > return "unknown signal";
> > }
>
> trivia:
>
> Unless the if tests are ordered most to least likely,
> perhaps it would be better to use a switch/case and
> let the compiler decide.
>
> switch (signr) {
> case SIGBUS: return "bus error";
> case SIGFPE: return "floating point exception";
> case SIGILL: return "illegal instruction";
> case SIGSEGV: return "segfault";
> case SIGTRAP: return "unhandled trap";
> }
> return "unknown signal";
> }
>
Hi, Joe, Christophe.
That's a nice enhancement. I'll do that in my next respin.
Cheers
Murilo
next prev parent reply other threads:[~2018-08-01 14:42 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-31 14:50 [PATCH v3 0/9] powerpc: Modernize unhandled signals message Murilo Opsfelder Araujo
2018-07-31 14:50 ` [PATCH v3 1/9] powerpc/traps: Print unhandled signals in a separate function Murilo Opsfelder Araujo
2018-07-31 14:50 ` [PATCH v3 2/9] powerpc/traps: Return early in show_signal_msg() Murilo Opsfelder Araujo
2018-07-31 14:50 ` [PATCH v3 3/9] powerpc/traps: Use %lx format " Murilo Opsfelder Araujo
2018-07-31 14:50 ` [PATCH v3 4/9] powerpc/traps: Print VMA for unhandled signals Murilo Opsfelder Araujo
2018-07-31 14:50 ` [PATCH v3 5/9] powerpc/traps: Print signal name " Murilo Opsfelder Araujo
2018-08-01 6:37 ` Christophe LEROY
2018-08-01 7:03 ` Joe Perches
2018-08-01 7:49 ` Segher Boessenkool
2018-08-01 14:44 ` Murilo Opsfelder Araujo
2018-08-01 14:42 ` Murilo Opsfelder Araujo [this message]
2018-07-31 14:50 ` [PATCH v3 6/9] powerpc: Do not call __kernel_text_address() in show_instructions() Murilo Opsfelder Araujo
2018-07-31 14:50 ` [PATCH v3 7/9] powerpc: Add stacktrace.h header Murilo Opsfelder Araujo
2018-07-31 14:50 ` [PATCH v3 8/9] powerpc/traps: Show instructions on exceptions Murilo Opsfelder Araujo
2018-07-31 14:50 ` [PATCH v3 9/9] powerpc/traps: Add line prefix in show_instructions() Murilo Opsfelder Araujo
2018-08-01 6:41 ` Christophe LEROY
2018-08-01 14:14 ` Michael Ellerman
2018-08-01 15:03 ` Murilo Opsfelder Araujo
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