Messages in this thread | | | Subject | Re: [patch] x86, ptrace: void dopiness | Date | Fri, 19 Sep 2008 09:17:11 -0400 | From | "linux-os (Dick Johnson)" <> |
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On Fri, 19 Sep 2008, Markus Metzger wrote:
> Remove void cast to explicitly ignore the return value. > > > Signed-off-by: markus.t.metzger@intel.com > > --- > Index: gits.x86/arch/x86/kernel/ptrace.c > =================================================================== > --- gits.x86.orig/arch/x86/kernel/ptrace.c 2008-06-30 13:21:07.%N +0200 > +++ gits.x86/arch/x86/kernel/ptrace.c 2008-09-19 13:53:02.%N +0200 > @@ -738,7 +738,7 @@ > unsigned int sig = 0; > > /* we ignore the error in case we were not tracing child */ > - (void)ds_release_bts(child); > + ds_release_bts(child); > > if (cfg.flags & PTRACE_BTS_O_SIGNAL) { > if (!cfg.signal) > @@ -947,7 +947,7 @@ > clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); > #endif > #ifdef CONFIG_X86_PTRACE_BTS > - (void)ds_release_bts(child); > + ds_release_bts(child); > > child->thread.debugctlmsr &= ~bts_cfg.debugctl_mask; > if (!child->thread.debugctlmsr) > --------------------------------------------------------------------- > Intel GmbH > Dornacher Strasse 1 > 85622 Feldkirchen/Muenchen Germany > Sitz der Gesellschaft: Feldkirchen bei Muenchen > Geschaeftsfuehrer: Douglas Lusk, Peter Gleissner, Hannes Schwaderer > Registergericht: Muenchen HRB 47456 Ust.-IdNr. > VAT Registration No.: DE129385895 > Citibank Frankfurt (BLZ 502 109 00) 600119052
I don't agree. Casting the return value to void, since it takes extra steps on the part of the writer, means that the writer is deliberately ignoring the return value because it has no objective use in the code.
Just letting unused return-values be ignored means that the writer either wanted to ignore it or simply forgot about it. The cast is supposed to remove doubt. Certain user-mode functions that are obviously used for effect like printf(), are exempt.
That said, putting a space between the cast and the function name helps in the use of some text-scanning tools and therefore improves maintainability.
Cheers, Dick Johnson Penguin : Linux version 2.6.25.17 on an i686 machine (4786.70 BogoMips). My book : http://www.AbominableFirebug.com/ _
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