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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

The code is also cleaner by kicking out the "if (0)" expressions.

[ coding-style fixes]
Signed-off-by: Stefani Seibold <>
Cc: Russell King <>
Cc: Hauke Mehrtens <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
latest commit 498d319bb5
@sstefani sstefani authored committed
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