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charset="utf-8" Since as a bug workaround (likely inapplicable to any 64-bit CPUs, but it probably doesn't hurt to keep this) we clear %ecx on input anyway, we can as well fall back to cpuid_count(). This allows getting rid of four risky casts and makes things type-safe. The latter aspect requires two type adjustments elsewhere. While adjusting init_intel_cacheinfo(), convert three other local variables there as well. For the struct cpuinfo_x86 change it is relevant to note that no 64-bit CPU comes without CPUID support, and hence cpuid_level is never set to -1; the comment there was simply stale. No functional change intended, yet of course generated code isn't identical. Signed-off-by: Jan Beulich --- It may also be interesting to see whether this addresses issues Coverity recently spotted (in error), in spec-ctrl.c:print_details(). Andrew considers cpuid() being (just) a macro as a possible reason. I'm willing to switch to an inline function, but I chose the macro route because this way it's less code (and hence less redundancy) overall, without any loss of functionality. --- a/xen/arch/x86/cpu/intel_cacheinfo.c +++ b/xen/arch/x86/cpu/intel_cacheinfo.c @@ -172,8 +172,7 @@ void init_intel_cacheinfo(struct cpuinfo c->x86_vendor !=3D X86_VENDOR_SHANGHAI) { /* supports eax=3D2 call */ - int i, j, n; - int regs[4]; + unsigned int i, j, n, regs[4]; unsigned char *dp =3D (unsigned char *)regs; int only_trace =3D 0; =20 --- a/xen/arch/x86/include/asm/cpufeature.h +++ b/xen/arch/x86/include/asm/cpufeature.h @@ -23,7 +23,7 @@ struct cpuinfo_x86 { unsigned char x86_vendor; /* CPU vendor */ unsigned char x86_model; unsigned char x86_mask; - int cpuid_level; /* Maximum supported CPUID level, -= 1=3Dno CPUID */ + unsigned int cpuid_level; /* Maximum supported CPUID level */ unsigned int extended_cpuid_level; /* Maximum supported CPUID extended= level */ unsigned int x86_capability[NCAPINTS]; char x86_vendor_id[16]; --- a/xen/arch/x86/include/asm/processor.h +++ b/xen/arch/x86/include/asm/processor.h @@ -131,13 +131,8 @@ static inline int cpu_nr_siblings(unsign * clear %ecx since some cpus (Cyrix MII) do not set or clear %ecx * resulting in stale register contents being returned. */ -#define cpuid(_op,_eax,_ebx,_ecx,_edx) \ - asm volatile ( "cpuid" \ - : "=3Da" (*(int *)(_eax)), \ - "=3Db" (*(int *)(_ebx)), \ - "=3Dc" (*(int *)(_ecx)), \ - "=3Dd" (*(int *)(_edx)) \ - : "0" (_op), "2" (0) ) +#define cpuid(op, eax, ebx, ecx, edx) \ + cpuid_count(op, 0, eax, ebx, ecx, edx) =20 /* Some CPUID calls want 'count' to be placed in ecx */ static inline void cpuid_count(