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Date: Wed, 13 Jul 2011 19:44:31 +0200 From: Bart Van Assche <bvanassche@....org> To: Jim Cromie <jim.cromie@...il.com> Cc: jbaron@...hat.com, linux-kernel@...r.kernel.org, joe@...ches.com, gregkh@...e.de, gnb@...h.org Subject: Re: [PATCH 03/21] dynamic_debug: process multiple commands on a line On Wed, Jul 13, 2011 at 9:25 AM, Jim Cromie <jim.cromie@...il.com> wrote: > On Mon, Jul 11, 2011 at 11:54 PM, Bart Van Assche <bvanassche@....org> wrote: > > On Mon, Jul 11, 2011 at 9:46 AM, Jim Cromie <jim.cromie@...il.com> wrote: > >> Process multiple commands per line, separated by ';'. All commands are > >> processed, independent of errors, allowing individual commands to fail, > >> for example when a module is not installed. Last error code is returned. > >> With this, extensive command sets can be given on the boot-line. > > > > Does the above mean that semicolon is considered a valid separator but > > newline not ? > > no, your printf example still works. > Note that it actually issues 2 writes to the control-file. > > root@...age:~# echo 1 > /sys/module/dynamic_debug/parameters/verbose > trol voyage:~# printf "module foo +ap\n module bar +ap" > > /dbg/dynamic_debug/cont > > FWIW, the \n approach doesnt help on the boot-line; > on mainline, the following will break the facility - > /dbg/dynamic_debug will not get created. > > Kernel command line: ... ddebug_query="module pc8736x_gpio +p \n > module nsc_gpio +p " Just as a note, I do not expect that anyone will pass a string containing an embedded newline via the kernel command line but I do expect that people will use cat or printf to send multiple queries at once to /sys/kernel/debug/dynamic_debug/control. Bart. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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