Re: [PATCH v3 26/26] kfifo: DECLARE_KIFO_PTR(fifo, u64) does not work on arm 32 bit
Em Thu, 30 Nov 2017 13:34:10 +0100 Stefani Seiboldescreveu: > On Thu, 2017-11-30 at 10:29 -0200, Mauro Carvalho Chehab wrote: > > Em Tue, 10 Oct 2017 09:59:42 +0200 > > Sean Young escreveu: > > > > > 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 > > > Acked-by: Stefani Seibold > > > > Hi Stefani/Andrew, > > > > As this patch is required for the LIRC rework, would be ok if I would > > merge it via the media tree? > > > > It is okay by me. But the question remains why this patch wasn't > already merged? > > Andrew: Any objections against this patch? I'm assuming that merging via media tree is ok for Andrew. So, I guess I'll just go ahead and merge it via my tree. Thanks, Mauro
Re: [PATCH v3 26/26] kfifo: DECLARE_KIFO_PTR(fifo, u64) does not work on arm 32 bit
On Thu, 2017-11-30 at 10:29 -0200, Mauro Carvalho Chehab wrote: > Em Tue, 10 Oct 2017 09:59:42 +0200 > Sean Youngescreveu: > > > 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 > > Acked-by: Stefani Seibold > > Hi Stefani/Andrew, > > As this patch is required for the LIRC rework, would be ok if I would > merge it via the media tree? > It is okay by me. But the question remains why this patch wasn't already merged? Andrew: Any objections against this patch? > > > > --- > > include/linux/kfifo.h | 3 ++- > > 1 file changed, 2 insertions(+), 1 deletion(-) > > > > diff --git a/include/linux/kfifo.h b/include/linux/kfifo.h > > index 41eb6fdf87a8..86b5fb08e96c 100644 > > --- a/include/linux/kfifo.h > > +++ b/include/linux/kfifo.h > > @@ -113,7 +113,8 @@ struct kfifo_rec_ptr_2 > > __STRUCT_KFIFO_PTR(unsigned char, 2, void); > > * array is a part of the structure and the fifo type where the > > array is > > * outside of the fifo structure. > > */ > > -#define__is_kfifo_ptr(fifo)(sizeof(*fifo) == > > sizeof(struct __kfifo)) > > +#define__is_kfifo_ptr(fifo) \ > > + (sizeof(*fifo) == sizeof(STRUCT_KFIFO_PTR(typeof(*(fifo)- > > >type > > > > /** > > * DECLARE_KFIFO_PTR - macro to declare a fifo pointer object > > > > Thanks, > Mauro
Re: [PATCH v3 26/26] kfifo: DECLARE_KIFO_PTR(fifo, u64) does not work on arm 32 bit
Em Tue, 10 Oct 2017 09:59:42 +0200 Sean Youngescreveu: > 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 > Acked-by: Stefani Seibold Hi Stefani/Andrew, As this patch is required for the LIRC rework, would be ok if I would merge it via the media tree? Thanks! Mauro > > --- > include/linux/kfifo.h | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/include/linux/kfifo.h b/include/linux/kfifo.h > index 41eb6fdf87a8..86b5fb08e96c 100644 > --- a/include/linux/kfifo.h > +++ b/include/linux/kfifo.h > @@ -113,7 +113,8 @@ struct kfifo_rec_ptr_2 __STRUCT_KFIFO_PTR(unsigned char, > 2, void); > * array is a part of the structure and the fifo type where the array is > * outside of the fifo structure. > */ > -#define __is_kfifo_ptr(fifo)(sizeof(*fifo) == sizeof(struct > __kfifo)) > +#define __is_kfifo_ptr(fifo) \ > + (sizeof(*fifo) == sizeof(STRUCT_KFIFO_PTR(typeof(*(fifo)->type > > /** > * DECLARE_KFIFO_PTR - macro to declare a fifo pointer object Thanks, Mauro
[PATCH v3 26/26] kfifo: DECLARE_KIFO_PTR(fifo, u64) does not work on arm 32 bit
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 YoungAcked-by: Stefani Seibold --- include/linux/kfifo.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/include/linux/kfifo.h b/include/linux/kfifo.h index 41eb6fdf87a8..86b5fb08e96c 100644 --- a/include/linux/kfifo.h +++ b/include/linux/kfifo.h @@ -113,7 +113,8 @@ struct kfifo_rec_ptr_2 __STRUCT_KFIFO_PTR(unsigned char, 2, void); * array is a part of the structure and the fifo type where the array is * outside of the fifo structure. */ -#define__is_kfifo_ptr(fifo)(sizeof(*fifo) == sizeof(struct __kfifo)) +#define__is_kfifo_ptr(fifo) \ + (sizeof(*fifo) == sizeof(STRUCT_KFIFO_PTR(typeof(*(fifo)->type /** * DECLARE_KFIFO_PTR - macro to declare a fifo pointer object
[PATCH v3 26/26] kfifo: DECLARE_KIFO_PTR(fifo, u64) does not work on arm 32 bit
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--- include/linux/kfifo.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/include/linux/kfifo.h b/include/linux/kfifo.h index 41eb6fdf87a8..86b5fb08e96c 100644 --- a/include/linux/kfifo.h +++ b/include/linux/kfifo.h @@ -113,7 +113,8 @@ struct kfifo_rec_ptr_2 __STRUCT_KFIFO_PTR(unsigned char, 2, void); * array is a part of the structure and the fifo type where the array is * outside of the fifo structure. */ -#define__is_kfifo_ptr(fifo)(sizeof(*fifo) == sizeof(struct __kfifo)) +#define__is_kfifo_ptr(fifo) \ + (sizeof(*fifo) == sizeof(STRUCT_KFIFO_PTR(typeof(*(fifo)->type /** * DECLARE_KFIFO_PTR - macro to declare a fifo pointer object -- 2.13.6