linux-kernel - Re: [PATCH v2 1/2] scripts: ftrace - move the sort-processing in ftrace

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Message-ID: <20211116080730.GV174703@worktop.programming.kicks-ass.net>
Date:   Tue, 16 Nov 2021 09:07:30 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Yinan Liu <yinan@...ux.alibaba.com>
Cc:     rostedt@...dmis.org, mark-pk.tsai@...iatek.com, mingo@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] scripts: ftrace - move the sort-processing in
 ftrace_init to compile time

On Tue, Nov 16, 2021 at 10:49:41AM +0800, Yinan Liu wrote:

> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> index 30bc880c3849..c776a2956237 100644
> --- a/kernel/trace/ftrace.c
> +++ b/kernel/trace/ftrace.c
> @@ -6406,8 +6406,9 @@ static int ftrace_process_locs(struct module *mod,
>  	if (!count)
>  		return 0;
>  
> -	sort(start, count, sizeof(*start),
> -	     ftrace_cmp_ips, NULL);
> +	if (mod)
> +		sort(start, count, sizeof(*start),
> +		     ftrace_cmp_ips, NULL);
>  

/me hands a bucket of {} your way. Also, can't sorttable be ran on
modules ?

> @@ -376,5 +466,20 @@ static int do_sort(Elf_Ehdr *ehdr,
>  		}
>  	}
>  #endif
> +	if (mcount_sort_thread) {
> +		void *retval = NULL;
> +		/* wait for mcount sort done */
> +		rc = pthread_join(mcount_sort_thread, &retval);
> +		if (rc)
> +			fprintf(stderr,
> +				"pthread_join failed '%s': %s\n",
> +				strerror(errno), fname);

Use some here too :-)

> +		else if (retval) {
> +			rc = -1;
> +			fprintf(stderr,
> +				"failed to sort mcount '%s': %s\n",
> +				(char *)retval, fname);
> +		}
> +	}
>  	return rc;
>  }