linux-kernel - Re: [PATCH] pstore/zone: rewrite some comments for better understanding

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Message-ID: <5e97121b-d682-48fc-b4ec-050b2b3315a0@linaro.org>
Date: Tue, 6 May 2025 11:23:57 +0300
From: Eugen Hristev <eugen.hristev@...aro.org>
To: kees@...nel.org
Cc: linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pstore/zone: rewrite some comments for better
 understanding



On 1/17/25 10:42, Eugen Hristev wrote:
> Rewrite some comments to make it more clear and easier to understand.
> 
> Signed-off-by: Eugen Hristev <eugen.hristev@...aro.org>
> ---

Hello Kees,

Is this patch worth it, or no need to bother ?

Eugen

>  fs/pstore/zone.c | 19 ++++++++++---------
>  1 file changed, 10 insertions(+), 9 deletions(-)
> 
> diff --git a/fs/pstore/zone.c b/fs/pstore/zone.c
> index ceb5639a0629..5fa2fa2e7aa7 100644
> --- a/fs/pstore/zone.c
> +++ b/fs/pstore/zone.c
> @@ -214,7 +214,7 @@ static int psz_zone_write(struct pstore_zone *zone,
>  		atomic_set(&zone->buffer->datalen, wlen + off);
>  	}
>  
> -	/* avoid to damage old records */
> +	/* avoid damaging old records */
>  	if (!is_on_panic() && !atomic_read(&pstore_zone_cxt.recovered))
>  		goto dirty;
>  
> @@ -249,7 +249,7 @@ static int psz_zone_write(struct pstore_zone *zone,
>  
>  	return 0;
>  dirty:
> -	/* no need to mark dirty if going to try next zone */
> +	/* no need to mark it dirty if going to try next zone */
>  	if (wcnt == -ENOMSG)
>  		return -ENOMSG;
>  	atomic_set(&zone->dirty, true);
> @@ -378,7 +378,7 @@ static int psz_kmsg_recover_meta(struct psz_context *cxt)
>  	struct timespec64 time = { };
>  	unsigned long i;
>  	/*
> -	 * Recover may on panic, we can't allocate any memory by kmalloc.
> +	 * Recover may happen on panic, we can't allocate any memory by kmalloc.
>  	 * So, we use local array instead.
>  	 */
>  	char buffer_header[sizeof(*buf) + sizeof(*hdr)] = {0};
> @@ -856,11 +856,11 @@ static int notrace psz_record_write(struct pstore_zone *zone,
>  
>  	/**
>  	 * psz_zone_write will set datalen as start + cnt.
> -	 * It work if actual data length lesser than buffer size.
> -	 * If data length greater than buffer size, pmsg will rewrite to
> -	 * beginning of zone, which make buffer->datalen wrongly.
> +	 * It works if actual data length is lesser than buffer size.
> +	 * If data length is greater than buffer size, pmsg will rewrite to
> +	 * the beginning of the zone, which makes buffer->datalen wrong.
>  	 * So we should reset datalen as buffer size once actual data length
> -	 * greater than buffer size.
> +	 * is greater than buffer size.
>  	 */
>  	if (is_full_data) {
>  		atomic_set(&zone->buffer->datalen, zone->buffer_size);
> @@ -878,8 +878,9 @@ static int notrace psz_pstore_write(struct pstore_record *record)
>  		atomic_set(&cxt->on_panic, 1);
>  
>  	/*
> -	 * if on panic, do not write except panic records
> -	 * Fix case that panic_write prints log which wakes up console backend.
> +	 * If on panic, do not write anything except panic records.
> +	 * Fix the case when panic_write prints log that wakes up
> +	 * console backend.
>  	 */
>  	if (is_on_panic() && record->type != PSTORE_TYPE_DMESG)
>  		return -EBUSY;