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Date: Fri, 14 Sep 2007 21:47:32 -0700 From: David Wilder <dwilder@...ibm.com> To: Andrew Morton <akpm@...ux-foundation.org> CC: linux-kernel@...r.kernel.org, SystemTAP <systemtap@...rces.redhat.com> Subject: Re: [PATCH 1/2] Trace code and documentation Andrew Morton wrote: >> +/* >> + * Based on blktrace code, Copyright (C) 2006 Jens Axboe <axboe@...e.de> >> > > So can we migrate blktrace to using this? > Yes, a blktrace patch is comming. >> + int ret; >> + >> + if (trace->flags & TRACE_DISABLE_STATE) >> + return -EINVAL; >> + >> + if (count > sizeof(buf) - 1) >> + return -EINVAL; >> + >> + if (copy_from_user(buf, buffer, count)) >> + return -EFAULT; >> + >> + buf[count] = '\0'; >> + >> + if (strncmp(buf, "start", strlen("start")) == 0 ) { >> + ret = trace_start(trace); >> + if (ret) >> + return ret; >> + } else if (strncmp(buffer, "stop", strlen("stop")) == 0) >> + trace_stop(trace); >> + else >> + return -EINVAL; >> > > What's the above code doing? Trying to cope with trailing chars after > "start" or "stop"? Is that actually needed? It's the \n, I assume? > Yes, the typical usage is "echo start > state" and echo adds a \n. Thanks for the comments, I will make the changes and resubmit. - 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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