I see sparse warning when I check a clk driver file in the kernel
on a 32-bit ARM build.
drivers/clk/sunxi/clk-sun6i-ar100.c:65:20: warning: cast truncates bits from
constant value (3ffffffff becomes ffffffff)
The code in question looks like:
static const struct factors_data sun6i_ar100_data = {
.mux = 16,
.muxmask = GENMASK(1, 0),
.table = &sun6i_ar100_config,
.getter = sun6i_get_ar100_factors,
};
where factors_data is
struct factors_data {
int enable;
int mux;
int muxmask;
const struct clk_factors_config *table;
void (*getter)(struct factors_request *req);
void (*recalc)(struct factors_request *req);
const char *name;
};
and sparse seems to be complaining about the muxmask assignment
here. Oddly, this doesn't happen on arm64 builds. Both times, I'm
checking this on an x86-64 machine.
$ sparse --version
v0.5.1-rc4-1-gfa71b7ac0594
Is there something confusing to sparse in the GENMASK macro?
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