On Wed, Aug 09, 2023 at 09:05:17PM +0000, Justin Stitt wrote: > With W=1 we see the following warning: > > | drivers/char/ipmi/ipmi_si_platform.c:272:15: error: \ > | cast to smaller integer type 'enum si_type' from \ > | 'const void *' [-Werror,-Wvoid-pointer-to-enum-cast] > | 272 | io.si_type = (enum si_type) match->data; > | | ^~~~~~~~~~~~~~~~~~~~~~~~~~ > > This is due to the fact that the `si_type` enum members are int-width > and a cast from pointer-width down to int will cause truncation and > possible data loss. Although in this case `si_type` has only a few > enumerated fields and thus there is likely no data loss occurring. > Nonetheless, this patch is necessary to the goal of promoting this > warning out of W=1. > > Link: https://github.com/ClangBuiltLinux/linux/issues/1902 > Link: https://lore.kernel.org/llvm/202308081000.ttl1eltr-...@intel.com/ > Reported-by: kernel test robot <l...@intel.com> > Signed-off-by: Justin Stitt <justinst...@google.com> > --- > Note: > Arnd had mentioned that there perhaps may be some semantic differences > between GCC and Clang regarding this warning or family of warnings. For > now, this patch (and others following) will yield less noisy W=1 builds > and hopefully materialize into this warning getting promoted out of W=1 > to an always-on warning. > --- > drivers/char/ipmi/ipmi_si_platform.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/char/ipmi/ipmi_si_platform.c > b/drivers/char/ipmi/ipmi_si_platform.c > index 505cc978c97a..0d509d683c0f 100644 > --- a/drivers/char/ipmi/ipmi_si_platform.c > +++ b/drivers/char/ipmi/ipmi_si_platform.c > @@ -269,7 +269,7 @@ static int of_ipmi_probe(struct platform_device *pdev) > } > > memset(&io, 0, sizeof(io)); > - io.si_type = (enum si_type) match->data; > + io.si_type = (unsigned long) match->data;
Wouldn't you want to use intptr_t or uintptr_t? -corey > io.addr_source = SI_DEVICETREE; > io.irq_setup = ipmi_std_irq_setup; > > > --- > base-commit: c1a515d3c0270628df8ae5f5118ba859b85464a2 > change-id: 20230809-cbl-1902-7532a747b731 > > Best regards, > -- > Justin Stitt <justinst...@google.com> > _______________________________________________ Openipmi-developer mailing list Openipmi-developer@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/openipmi-developer
