[f2fs-dev] [PATCH] f2fs: drop useless initializer and unneeded local variable

[f2fs-dev] [PATCH] f2fs: drop useless initializer and unneeded local variable

[Yangtao Li via Linux-f2fs-devel]

No need to initialize idx twice. BTW, remove the unnecessary cnt variable.

Signed-off-by: Yangtao Li <frank.li@vivo.com>
---
 fs/f2fs/iostat.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/fs/f2fs/iostat.c b/fs/f2fs/iostat.c
index 3166a8939ed4..335b055ffe7d 100644
--- a/fs/f2fs/iostat.c
+++ b/fs/f2fs/iostat.c
@@ -97,8 +97,7 @@ int __maybe_unused iostat_info_seq_show(struct seq_file *seq, void *offset)
 
 static inline void __record_iostat_latency(struct f2fs_sb_info *sbi)
 {
-	int io, idx = 0;
-	unsigned int cnt;
+	int io, idx;
 	struct f2fs_iostat_latency iostat_lat[MAX_IO_TYPE][NR_PAGE_TYPE];
 	struct iostat_lat_info *io_lat = sbi->iostat_io_lat;
 	unsigned long flags;
@@ -106,12 +105,11 @@ static inline void __record_iostat_latency(struct f2fs_sb_info *sbi)
 	spin_lock_irqsave(&sbi->iostat_lat_lock, flags);
 	for (idx = 0; idx < MAX_IO_TYPE; idx++) {
 		for (io = 0; io < NR_PAGE_TYPE; io++) {
-			cnt = io_lat->bio_cnt[idx][io];
 			iostat_lat[idx][io].peak_lat =
 			   jiffies_to_msecs(io_lat->peak_lat[idx][io]);
-			iostat_lat[idx][io].cnt = cnt;
-			iostat_lat[idx][io].avg_lat = cnt ?
-			   jiffies_to_msecs(io_lat->sum_lat[idx][io]) / cnt : 0;
+			iostat_lat[idx][io].cnt = io_lat->bio_cnt[idx][io];
+			iostat_lat[idx][io].avg_lat = iostat_lat[idx][io].cnt ?
+			   jiffies_to_msecs(io_lat->sum_lat[idx][io]) / iostat_lat[idx][io].cnt : 0;
 			io_lat->sum_lat[idx][io] = 0;
 			io_lat->peak_lat[idx][io] = 0;
 			io_lat->bio_cnt[idx][io] = 0;
-- 
2.25.1



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Re: [f2fs-dev] [PATCH] f2fs: drop useless initializer and unneeded local variable

[Chao Yu]

On 2022/12/22 16:18, Yangtao Li wrote:
> No need to initialize idx twice. BTW, remove the unnecessary cnt variable.
> 
> Signed-off-by: Yangtao Li <frank.li@vivo.com>
> ---
>   fs/f2fs/iostat.c | 10 ++++------
>   1 file changed, 4 insertions(+), 6 deletions(-)
> 
> diff --git a/fs/f2fs/iostat.c b/fs/f2fs/iostat.c
> index 3166a8939ed4..335b055ffe7d 100644
> --- a/fs/f2fs/iostat.c
> +++ b/fs/f2fs/iostat.c
> @@ -97,8 +97,7 @@ int __maybe_unused iostat_info_seq_show(struct seq_file *seq, void *offset)
>   
>   static inline void __record_iostat_latency(struct f2fs_sb_info *sbi)
>   {
> -	int io, idx = 0;
> -	unsigned int cnt;
> +	int io, idx;
>   	struct f2fs_iostat_latency iostat_lat[MAX_IO_TYPE][NR_PAGE_TYPE];
>   	struct iostat_lat_info *io_lat = sbi->iostat_io_lat;
>   	unsigned long flags;
> @@ -106,12 +105,11 @@ static inline void __record_iostat_latency(struct f2fs_sb_info *sbi)
>   	spin_lock_irqsave(&sbi->iostat_lat_lock, flags);
>   	for (idx = 0; idx < MAX_IO_TYPE; idx++) {
>   		for (io = 0; io < NR_PAGE_TYPE; io++) {
> -			cnt = io_lat->bio_cnt[idx][io];
>   			iostat_lat[idx][io].peak_lat =
>   			   jiffies_to_msecs(io_lat->peak_lat[idx][io]);
> -			iostat_lat[idx][io].cnt = cnt;
> -			iostat_lat[idx][io].avg_lat = cnt ?
> -			   jiffies_to_msecs(io_lat->sum_lat[idx][io]) / cnt : 0;
> +			iostat_lat[idx][io].cnt = io_lat->bio_cnt[idx][io];
> +			iostat_lat[idx][io].avg_lat = iostat_lat[idx][io].cnt ?
> +			   jiffies_to_msecs(io_lat->sum_lat[idx][io]) / iostat_lat[idx][io].cnt : 0;

exceed 80 column?

Thanks,

>   			io_lat->sum_lat[idx][io] = 0;
>   			io_lat->peak_lat[idx][io] = 0;
>   			io_lat->bio_cnt[idx][io] = 0;


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Re: [f2fs-dev] [PATCH] f2fs: drop useless initializer and unneeded local variable

[Yangtao Li via Linux-f2fs-devel]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain; charset=y, Size: 530 bytes --]

> exceed 80 column?

I use the checkpatch.pl script to check that there are no errors.
Earlier, the default line length was 80 columns.
Commit bdc48fa11e46 (“checkpatch/coding-style: deprecate 80-column warning”) increased the limit to 100 columns. 

$ ./scripts/checkpatch.pl 0001-f2fs-drop-useless-initializer-and-unneeded-local-var.patch
total: 0 errors, 0 warnings, 24 lines checked

0001-f2fs-drop-useless-initializer-and-unneeded-local-var.patch has no obvious style problems and is ready for submission.

Thx,
Yangtao


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Re: [f2fs-dev] [PATCH] f2fs: drop useless initializer and unneeded local variable

[patchwork-bot+f2fs]

Hello:

This patch was applied to jaegeuk/f2fs.git (dev)
by Jaegeuk Kim <jaegeuk@kernel.org>:

On Thu, 22 Dec 2022 16:18:55 +0800 you wrote:
> No need to initialize idx twice. BTW, remove the unnecessary cnt variable.
> 
> Signed-off-by: Yangtao Li <frank.li@vivo.com>
> ---
>  fs/f2fs/iostat.c | 10 ++++------
>  1 file changed, 4 insertions(+), 6 deletions(-)

Here is the summary with links:
  - [f2fs-dev] f2fs: drop useless initializer and unneeded local variable
    https://git.kernel.org/jaegeuk/f2fs/c/c5f9db2548d0

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
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