Messages in this thread | | | Date | Wed, 1 Aug 2018 11:42:35 -0300 | From | Murilo Opsfelder Araujo <> | Subject | Re: [PATCH v3 5/9] powerpc/traps: Print signal name for unhandled signals |
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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
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