On Mon, Dec 10, 2018 at 02:10:20PM -0800, Stephen Hemminger wrote:
> It appears that RDMA is broken on 32 bit platforms.
> Sure you don't run on 32bit, but iproute2 needs to build everywhere.
>
> The issue is that you are assuming a C enum can hold 64 bits.
> The standard says enum only has to hold "int" values.
> So it breaks on 32bit.
>
> The issue is deeper than just a trivial fix. Please either change iproute
> config script to not build RDMA if sizeof(enum) < 64 or fix the code to
> use a safe value like uint64_t.
>
> rdma
> CC rdma.o
> CC utils.o
> CC dev.o
> CC link.o
> In file included from rdma.h:26:0,
> from dev.c:12:
> dev.c: In function ‘dev_caps_to_str’:
> ../include/utils.h:269:38: warning: left shift count >= width of type
> [-Wshift-count-overflow]
> #define BIT(nr) (1UL << (nr))
> ^
> rdma.h:32:61: note: in expansion of macro ‘BIT’
> #define RDMA_BITMAP_ENUM(name, bit_no) RDMA_BITMAP_##name = BIT(bit_no),
> ^~~
> If you wade through the macro swamp:
> dev.c
> #define RDMA_DEV_FLAGS(x) \
>
> x(SG_GAPS_REG, 32) \
>
> enum { RDMA_DEV_FLAGS(RDMA_BITMAP_ENUM) };
>
> Expands to:
> enum {
> RDMA_BITMAP_SG_GAPS_REG = (1UL << (32)),
> };
>Thanks for the report, I reproduced and will do my best to send patches tomorrow.
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