Messages in this thread | | | Subject | Re: 2.6.20-rc7: known regressions | From | Frédéric Riss <> | Date | Sat, 03 Feb 2007 10:49:35 +0100 |
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Le samedi 03 février 2007 à 10:33 +0100, Andi Kleen a écrit : > > /* > > + * Wrap all the virtual calls in a way that forces the parameters on the stack. > > + */ > > + > > +#define efi_call_virt(f, args...) \ > > + ((efi_##f##_t __attribute__((regparm(0)))*)efi.systab->runtime->f)(args) > > + > > +static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc) > > +{ > > + return efi_call_virt(get_time, tm, tc); > > Wouldn't it be better to just declare the pointers in efi.systab with > the correct attribute? Then you wouldn't need all that ugly casting.
Was what I did in the initial patch: http://lkml.org/lkml/2007/1/30/258
The issue is that the structure definition is used on multiple architectures (for now ia64 and i386) which might used different calling conventions. As Bjorn Helgaas pointed out, ia64 already has such wrapper functions. I agree that the casting isn't the nicest thing, but I prefer that to writing asm stubs.
Fred
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