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SubjectRe: linux-next: build failure after merge of the arm tree
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On 21/04/2017 00:40, Stephen Rothwell wrote:

> After merging the arm tree, today's linux-next build (arm
> multi_v7_defconfig) failed like this:
>
> In file included from include/linux/bitops.h:36:0,
> from include/linux/bitmap.h:7,
> from drivers/dma/sun4i-dma.c:11:
> drivers/dma/sun4i-dma.c: In function 'find_and_use_pchan':
> include/linux/bitops.h:56:34: error:
> passing argument 1 of '_find_next_zero_bit_le' from incompatible pointer type [-Werror=incompatible-pointer-types]
> for ((bit) = find_next_zero_bit((addr), (size), (bit)); \
> ^
> arch/arm/include/asm/bitops.h:200:61: note: in definition of macro 'find_next_zero_bit'
> #define find_next_zero_bit(p,sz,off) _find_next_zero_bit_le(p,sz,off)
> ^
> drivers/dma/sun4i-dma.c:241:2: note: in expansion of macro 'for_each_clear_bit_from'
> for_each_clear_bit_from(i, &priv->pchans_used, max) {
> ^
> arch/arm/include/asm/bitops.h:163:12: note:
> expected 'const long unsigned int *' but argument is of type 'long unsigned int (*)[1]'
> extern int _find_next_zero_bit_le(const unsigned long *p, int size, int offset);
> ^
> [...]
>
> Caused (or exposed) by commit
>
> c4f8ff16b46b ("ARM: 8669/1: bitops: Align prototypes to generic API")
>
> I have used the arm tree from next-20170420 for today.

Weird that I didn't catch this when I ran make allyesconfig.
https://www.spinics.net/lists/arm-kernel/msg573736.html

Anyway, the fix is trivial.

The "pchans_used" field is an unsigned long array.
for_each_clear_bit_from() expects an unsigned long pointer,
not an array address.

I'll send a patch to the drivers/dma maintainers.

$ make C=2 drivers/dma/sun4i-dma.o
CHECK drivers/dma/sun4i-dma.c
CC drivers/dma/sun4i-dma.o

Regards.

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