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Groups > linux.kernel > #1637319 > unrolled thread

[PATCH 0/4] DMA-buf: Fine-tuning for four function implementations

Started bySF Markus Elfring <elfring@users.sourceforge.net>
First post2017-05-08 11:20 +0200
Last post2017-05-09 06:30 +0200
Articles 10 — 3 participants

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  [PATCH 0/4] DMA-buf: Fine-tuning for four function implementations SF Markus Elfring <elfring@users.sourceforge.net> - 2017-05-08 11:20 +0200
    [PATCH 4/4] dma-buf: Use seq_putc() in two functions SF Markus Elfring <elfring@users.sourceforge.net> - 2017-05-08 11:20 +0200
      Re: [PATCH 4/4] dma-buf: Use seq_putc() in two functions Gustavo Padovan <gustavo@padovan.org> - 2017-05-08 16:40 +0200
    [PATCH 1/4] dma-buf: Combine two function calls into one in  dma_buf_debug_show() SF Markus Elfring <elfring@users.sourceforge.net> - 2017-05-08 11:20 +0200
      Re: [PATCH 1/4] dma-buf: Combine two function calls into one in  dma_buf_debug_show() Gustavo Padovan <gustavo@padovan.org> - 2017-05-08 16:40 +0200
    [PATCH 3/4] dma-buf: Adjust a null pointer check in dma_buf_attach() SF Markus Elfring <elfring@users.sourceforge.net> - 2017-05-08 11:20 +0200
      Re: [PATCH 3/4] dma-buf: Adjust a null pointer check in  dma_buf_attach() Gustavo Padovan <gustavo@padovan.org> - 2017-05-08 16:40 +0200
    [PATCH 2/4] dma-buf: Improve a size determination in dma_buf_attach() SF Markus Elfring <elfring@users.sourceforge.net> - 2017-05-08 11:20 +0200
      Re: [PATCH 2/4] dma-buf: Improve a size determination in  dma_buf_attach() Gustavo Padovan <gustavo@padovan.org> - 2017-05-08 16:40 +0200
    Re: [PATCH 0/4] DMA-buf: Fine-tuning for four function implementations Sumit Semwal <sumit.semwal@linaro.org> - 2017-05-09 06:30 +0200

#1637319 — [PATCH 0/4] DMA-buf: Fine-tuning for four function implementations

FromSF Markus Elfring <elfring@users.sourceforge.net>
Date2017-05-08 11:20 +0200
Subject[PATCH 0/4] DMA-buf: Fine-tuning for four function implementations
Message-ID<tEMZI-1ZS-5@gated-at.bofh.it>
From: Markus Elfring <elfring@users.sourceforge.net>
Date: Mon, 8 May 2017 11:05:05 +0200

A few update suggestions were taken into account
from static source code analysis.

Markus Elfring (4):
  Combine two function calls into one in dma_buf_debug_show()
  Improve a size determination in dma_buf_attach()
  Adjust a null pointer check in dma_buf_attach()
  Use seq_putc() in two functions

 drivers/dma-buf/dma-buf.c    | 8 +++-----
 drivers/dma-buf/sync_debug.c | 6 +++---
 2 files changed, 6 insertions(+), 8 deletions(-)

-- 
2.12.2

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#1637322 — [PATCH 4/4] dma-buf: Use seq_putc() in two functions

FromSF Markus Elfring <elfring@users.sourceforge.net>
Date2017-05-08 11:20 +0200
Subject[PATCH 4/4] dma-buf: Use seq_putc() in two functions
Message-ID<tEMZI-1ZS-17@gated-at.bofh.it>
In reply to#1637319
From: Markus Elfring <elfring@users.sourceforge.net>
Date: Mon, 8 May 2017 10:55:42 +0200

Three single characters (line breaks) should be put into a sequence.
Thus use the corresponding function "seq_putc".

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 drivers/dma-buf/sync_debug.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/dma-buf/sync_debug.c b/drivers/dma-buf/sync_debug.c
index c769dc653b34..a0d780ab68c3 100644
--- a/drivers/dma-buf/sync_debug.c
+++ b/drivers/dma-buf/sync_debug.c
@@ -110,7 +110,7 @@ static void sync_print_fence(struct seq_file *s,
 		}
 	}
 
-	seq_puts(s, "\n");
+	seq_putc(s, '\n');
 }
 
 static void sync_print_obj(struct seq_file *s, struct sync_timeline *obj)
@@ -161,7 +161,7 @@ static int sync_debugfs_show(struct seq_file *s, void *unused)
 				     sync_timeline_list);
 
 		sync_print_obj(s, obj);
-		seq_puts(s, "\n");
+		seq_putc(s, '\n');
 	}
 	spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
 
@@ -173,7 +173,7 @@ static int sync_debugfs_show(struct seq_file *s, void *unused)
 			container_of(pos, struct sync_file, sync_file_list);
 
 		sync_print_sync_file(s, sync_file);
-		seq_puts(s, "\n");
+		seq_putc(s, '\n');
 	}
 	spin_unlock_irqrestore(&sync_file_list_lock, flags);
 	return 0;
-- 
2.12.2

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#1637474 — Re: [PATCH 4/4] dma-buf: Use seq_putc() in two functions

FromGustavo Padovan <gustavo@padovan.org>
Date2017-05-08 16:40 +0200
SubjectRe: [PATCH 4/4] dma-buf: Use seq_putc() in two functions
Message-ID<tERZo-55q-23@gated-at.bofh.it>
In reply to#1637322
Hi Markus,

Thank for your patches.

2017-05-08 SF Markus Elfring <elfring@users.sourceforge.net>:

> From: Markus Elfring <elfring@users.sourceforge.net>
> Date: Mon, 8 May 2017 10:55:42 +0200
> 
> Three single characters (line breaks) should be put into a sequence.
> Thus use the corresponding function "seq_putc".
> 
> This issue was detected by using the Coccinelle software.
> 
> Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
> ---
>  drivers/dma-buf/sync_debug.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)

Reviewed-by: Gustavo Padovan <gustavo.padovan@collabora.com>

Gustavo

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#1637323 — [PATCH 1/4] dma-buf: Combine two function calls into one in dma_buf_debug_show()

FromSF Markus Elfring <elfring@users.sourceforge.net>
Date2017-05-08 11:20 +0200
Subject[PATCH 1/4] dma-buf: Combine two function calls into one in dma_buf_debug_show()
Message-ID<tEMZI-1ZS-19@gated-at.bofh.it>
In reply to#1637319
From: Markus Elfring <elfring@users.sourceforge.net>
Date: Mon, 8 May 2017 10:32:44 +0200

A bit of data was put into a sequence by two separate function calls.
Print the same data by a single function call instead.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 drivers/dma-buf/dma-buf.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 512bdbc23bbb..53257c166f4d 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -1122,9 +1122,7 @@ static int dma_buf_debug_show(struct seq_file *s, void *unused)
 		attach_count = 0;
 
 		list_for_each_entry(attach_obj, &buf_obj->attachments, node) {
-			seq_puts(s, "\t");
-
-			seq_printf(s, "%s\n", dev_name(attach_obj->dev));
+			seq_printf(s, "\t%s\n", dev_name(attach_obj->dev));
 			attach_count++;
 		}
 
-- 
2.12.2

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#1637478 — Re: [PATCH 1/4] dma-buf: Combine two function calls into one in dma_buf_debug_show()

FromGustavo Padovan <gustavo@padovan.org>
Date2017-05-08 16:40 +0200
SubjectRe: [PATCH 1/4] dma-buf: Combine two function calls into one in dma_buf_debug_show()
Message-ID<tERZp-55q-31@gated-at.bofh.it>
In reply to#1637323
2017-05-08 SF Markus Elfring <elfring@users.sourceforge.net>:

> From: Markus Elfring <elfring@users.sourceforge.net>
> Date: Mon, 8 May 2017 10:32:44 +0200
> 
> A bit of data was put into a sequence by two separate function calls.
> Print the same data by a single function call instead.
> 
> This issue was detected by using the Coccinelle software.
> 
> Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
> ---
>  drivers/dma-buf/dma-buf.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)

Reviewed-by: Gustavo Padovan <gustavo.padovan@collabora.com>

Gustavo

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#1637324 — [PATCH 3/4] dma-buf: Adjust a null pointer check in dma_buf_attach()

FromSF Markus Elfring <elfring@users.sourceforge.net>
Date2017-05-08 11:20 +0200
Subject[PATCH 3/4] dma-buf: Adjust a null pointer check in dma_buf_attach()
Message-ID<tEMZI-1ZS-15@gated-at.bofh.it>
In reply to#1637319
From: Markus Elfring <elfring@users.sourceforge.net>
Date: Mon, 8 May 2017 10:54:17 +0200

The script "checkpatch.pl" pointed information out like the following.

Comparison to NULL could be written "!attach"

Thus adjust this expression.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 drivers/dma-buf/dma-buf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 9887d72cf804..4a038dcf5361 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -559,7 +559,7 @@ struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
 		return ERR_PTR(-EINVAL);
 
 	attach = kzalloc(sizeof(*attach), GFP_KERNEL);
-	if (attach == NULL)
+	if (!attach)
 		return ERR_PTR(-ENOMEM);
 
 	attach->dev = dev;
-- 
2.12.2

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#1637475 — Re: [PATCH 3/4] dma-buf: Adjust a null pointer check in dma_buf_attach()

FromGustavo Padovan <gustavo@padovan.org>
Date2017-05-08 16:40 +0200
SubjectRe: [PATCH 3/4] dma-buf: Adjust a null pointer check in dma_buf_attach()
Message-ID<tERZo-55q-21@gated-at.bofh.it>
In reply to#1637324
2017-05-08 SF Markus Elfring <elfring@users.sourceforge.net>:

> From: Markus Elfring <elfring@users.sourceforge.net>
> Date: Mon, 8 May 2017 10:54:17 +0200
> 
> The script "checkpatch.pl" pointed information out like the following.
> 
> Comparison to NULL could be written "!attach"
> 
> Thus adjust this expression.
> 
> Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
> ---
>  drivers/dma-buf/dma-buf.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Gustavo Padovan <gustavo.padovan@collabora.com>

Gustavo

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#1637325 — [PATCH 2/4] dma-buf: Improve a size determination in dma_buf_attach()

FromSF Markus Elfring <elfring@users.sourceforge.net>
Date2017-05-08 11:20 +0200
Subject[PATCH 2/4] dma-buf: Improve a size determination in dma_buf_attach()
Message-ID<tEMZI-1ZS-21@gated-at.bofh.it>
In reply to#1637319
From: Markus Elfring <elfring@users.sourceforge.net>
Date: Mon, 8 May 2017 10:50:09 +0200

Replace the specification of a data structure by a pointer dereference
as the parameter for the operator "sizeof" to make the corresponding size
determination a bit safer according to the Linux coding style convention.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 drivers/dma-buf/dma-buf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 53257c166f4d..9887d72cf804 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -558,7 +558,7 @@ struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
 	if (WARN_ON(!dmabuf || !dev))
 		return ERR_PTR(-EINVAL);
 
-	attach = kzalloc(sizeof(struct dma_buf_attachment), GFP_KERNEL);
+	attach = kzalloc(sizeof(*attach), GFP_KERNEL);
 	if (attach == NULL)
 		return ERR_PTR(-ENOMEM);
 
-- 
2.12.2

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#1637477 — Re: [PATCH 2/4] dma-buf: Improve a size determination in dma_buf_attach()

FromGustavo Padovan <gustavo@padovan.org>
Date2017-05-08 16:40 +0200
SubjectRe: [PATCH 2/4] dma-buf: Improve a size determination in dma_buf_attach()
Message-ID<tERZo-55q-25@gated-at.bofh.it>
In reply to#1637325
2017-05-08 SF Markus Elfring <elfring@users.sourceforge.net>:

> From: Markus Elfring <elfring@users.sourceforge.net>
> Date: Mon, 8 May 2017 10:50:09 +0200
> 
> Replace the specification of a data structure by a pointer dereference
> as the parameter for the operator "sizeof" to make the corresponding size
> determination a bit safer according to the Linux coding style convention.
> 
> Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
> ---
>  drivers/dma-buf/dma-buf.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Gustavo Padovan <gustavo.padovan@collabora.com>                    

Gustavo

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#1637858

FromSumit Semwal <sumit.semwal@linaro.org>
Date2017-05-09 06:30 +0200
Message-ID<tF4WB-54x-1@gated-at.bofh.it>
In reply to#1637319
Hello Markus,

On 8 May 2017 at 14:40, SF Markus Elfring <elfring@users.sourceforge.net> wrote:
> From: Markus Elfring <elfring@users.sourceforge.net>
> Date: Mon, 8 May 2017 11:05:05 +0200
>
> A few update suggestions were taken into account
> from static source code analysis.
>
> Markus Elfring (4):
>   Combine two function calls into one in dma_buf_debug_show()
>   Improve a size determination in dma_buf_attach()
>   Adjust a null pointer check in dma_buf_attach()
>   Use seq_putc() in two functions

All queued up in drm-misc-next now. Thanks!
>
>  drivers/dma-buf/dma-buf.c    | 8 +++-----
>  drivers/dma-buf/sync_debug.c | 6 +++---
>  2 files changed, 6 insertions(+), 8 deletions(-)
>
> --
> 2.12.2
>

Best regards,
Sumit.

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