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authorStefani Seibold <stefani@seibold.net>2013-11-14 22:32:17 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2013-11-15 00:32:23 (GMT)
commit498d319bb512992ef0784c278fa03679f2f5649d (patch)
tree2793b41c3a98b858d24aa833ccc2bfb2f6d60974 /samples
parenta019e48cfbfb358786326db3dbc1c565b8f14a56 (diff)
kfifo API type safety
This patch enhances the type safety for the kfifo API. It is now safe to put const data into a non const FIFO and the API will now generate a compiler warning when reading from the fifo where the destination address is pointing to a const variable. As a side effect the kfifo_put() does now expect the value of an element instead a pointer to the element. This was suggested Russell King. It make the handling of the kfifo_put easier since there is no need to create a helper variable for getting the address of a pointer or to pass integers of different sizes. IMHO the API break is okay, since there are currently only six users of kfifo_put(). The code is also cleaner by kicking out the "if (0)" expressions. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Stefani Seibold <stefani@seibold.net> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Hauke Mehrtens <hauke@hauke-m.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'samples')
-rw-r--r--samples/kfifo/bytestream-example.c4
-rw-r--r--samples/kfifo/dma-example.c2
-rw-r--r--samples/kfifo/inttype-example.c4
3 files changed, 5 insertions, 5 deletions
diff --git a/samples/kfifo/bytestream-example.c b/samples/kfifo/bytestream-example.c
index cfe40ad..2fca916 100644
--- a/samples/kfifo/bytestream-example.c
+++ b/samples/kfifo/bytestream-example.c
@@ -64,7 +64,7 @@ static int __init testfunc(void)
/* put values into the fifo */
for (i = 0; i != 10; i++)
- kfifo_put(&test, &i);
+ kfifo_put(&test, i);
/* show the number of used elements */
printk(KERN_INFO "fifo len: %u\n", kfifo_len(&test));
@@ -85,7 +85,7 @@ static int __init testfunc(void)
kfifo_skip(&test);
/* put values into the fifo until is full */
- for (i = 20; kfifo_put(&test, &i); i++)
+ for (i = 20; kfifo_put(&test, i); i++)
;
printk(KERN_INFO "queue len: %u\n", kfifo_len(&test));
diff --git a/samples/kfifo/dma-example.c b/samples/kfifo/dma-example.c
index 0647379..aa243db 100644
--- a/samples/kfifo/dma-example.c
+++ b/samples/kfifo/dma-example.c
@@ -39,7 +39,7 @@ static int __init example_init(void)
kfifo_in(&fifo, "test", 4);
for (i = 0; i != 9; i++)
- kfifo_put(&fifo, &i);
+ kfifo_put(&fifo, i);
/* kick away first byte */
kfifo_skip(&fifo);
diff --git a/samples/kfifo/inttype-example.c b/samples/kfifo/inttype-example.c
index 6f8e79e..8dc3c2e 100644
--- a/samples/kfifo/inttype-example.c
+++ b/samples/kfifo/inttype-example.c
@@ -61,7 +61,7 @@ static int __init testfunc(void)
/* put values into the fifo */
for (i = 0; i != 10; i++)
- kfifo_put(&test, &i);
+ kfifo_put(&test, i);
/* show the number of used elements */
printk(KERN_INFO "fifo len: %u\n", kfifo_len(&test));
@@ -78,7 +78,7 @@ static int __init testfunc(void)
kfifo_skip(&test);
/* put values into the fifo until is full */
- for (i = 20; kfifo_put(&test, &i); i++)
+ for (i = 20; kfifo_put(&test, i); i++)
;
printk(KERN_INFO "queue len: %u\n", kfifo_len(&test));

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