kfifo: DECLARE_KIFO_PTR(fifo, u64) does not work on arm 32 bit

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If you try to store u64 in a kfifo (or a struct with u64 members),
then the buf member of __STRUCT_KFIFO_PTR will cause 4 bytes
padding due to alignment (note that struct __kfifo is 20 bytes
on 32 bit).

That in turn causes the __is_kfifo_ptr() to fail, which is caught
by kfifo_alloc(), which now returns EINVAL.

So, ensure that __is_kfifo_ptr() compares to the right structure.

Signed-off-by: Sean Young <sean@mess.org>
Acked-by: Stefani Seibold <stefani@seibold.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

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Sean Young 2017-10-08 12:12:16 -04:00 • committed by Mauro Carvalho Chehab

parent 62d6f1994b

commit 8a866fee39

1 changed files with 2 additions and 1 deletions

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include/linux/kfifo.h

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