Messages in this thread | | | Date | Wed, 26 Jul 2017 15:46:17 +0200 | From | Luc Van Oostenryck <> | Subject | Re: Sparse warnings on GENMASK + arm32 |
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On Wed, Jul 26, 2017 at 09:33:01AM -0400, Lance Richardson wrote: > > From: "Stephen Boyd" <sboyd@codeaurora.org> > > 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) > > Hmm, it seems sparse is incorrectly taking ~0UL to be a 64-bit value > while BITS_PER_LONG is (correctly) evaluated to be 32. > > #define GENMASK(h, l) \ > (((~0UL) << (l)) & (~0UL >> (BITS_PER_LONG - 1 - (h))))
It's the kernel CHECKFLAGS that should be using -m32/-m64 if built on a machine with a different wordsize tht the arch.
I sent earlier a patch for ARM, I just forgot to CC the mailing list here.
-- Luc
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