linux-kernel - Re: [PATCH v2 06/13] perf header: add struct feat

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Message-ID: <20170525080757.GC14467@krava>
Date:   Thu, 25 May 2017 10:07:57 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     David Carrillo-Cisneros <davidcc@...gle.com>
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>, Simon Que <sque@...omium.org>,
        Wang Nan <wangnan0@...wei.com>, Jiri Olsa <jolsa@...nel.org>,
        He Kuang <hekuang@...wei.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        David Ahern <dsa@...ulusnetworks.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Stephane Eranian <eranian@...gle.com>,
        Paul Turner <pjt@...gle.com>
Subject: Re: [PATCH v2 06/13] perf header: add struct feat_fd for write

On Tue, May 23, 2017 at 12:48:46AM -0700, David Carrillo-Cisneros wrote:

SNIP

> @@ -2211,18 +2214,18 @@ static int do_write_feat(int fd, struct perf_header *h, int type,
>  		if (!feat_ops[type].write)
>  			return -1;
>  
> -		(*p)->offset = lseek(fd, 0, SEEK_CUR);
> +		(*p)->offset = lseek(fd->fd, 0, SEEK_CUR);
>  
> -		err = feat_ops[type].write(fd, h, evlist);
> +		err = feat_ops[type].write(fd, evlist);
>  		if (err < 0) {
>  			pr_debug("failed to write feature %s\n", feat_ops[type].name);
>  
>  			/* undo anything written */
> -			lseek(fd, (*p)->offset, SEEK_SET);
> +			lseek(fd->fd, (*p)->offset, SEEK_SET);
>  
>  			return -1;
>  		}
> -		(*p)->size = lseek(fd, 0, SEEK_CUR) - (*p)->offset;
> +		(*p)->size = lseek(fd->fd, 0, SEEK_CUR) - (*p)->offset;
>  		(*p)++;
>  	}
>  	return ret;
> @@ -2232,12 +2235,18 @@ static int perf_header__adds_write(struct perf_header *header,
>  				   struct perf_evlist *evlist, int fd)
>  {
>  	int nr_sections;
> +	struct feat_fd fdd;
>  	struct perf_file_section *feat_sec, *p;
>  	int sec_size;
>  	u64 sec_start;
>  	int feat;
>  	int err;
>  
> +	fdd = (struct feat_fd){
> +		.fd  = fd,
> +		.ph = header,
> +	};

could you unite the naming for struct feat_fd variables?

it's slightly confusing, especialy when you keep the 'fd'
name in some cases.. ff? ;-)

jirka