The title of this patch is quite generic, especially the 'update'. Perhaps say:
"ARM: Change MPIDR_AFFINITY_LEVEL to ignore Aff3" On Tue, Aug 16, 2016 at 11:46:55AM +0100, Vladimir Murzin wrote: > vgic-v3 driver queries CPU affinity level up to Aff3, which is valid for > arm64. > However, for arm up to Aff2 levels are supported, so querying for 3rd level > ends with upper bits of MPIDR are treated as valid affinity level which > is not true. So, report zero for any affinity level above 2. > > Signed-off-by: Vladimir Murzin <vladimir.mur...@arm.com> > --- > arch/arm/include/asm/cputype.h | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/arch/arm/include/asm/cputype.h b/arch/arm/include/asm/cputype.h > index 1ee94c7..96cef49 100644 > --- a/arch/arm/include/asm/cputype.h > +++ b/arch/arm/include/asm/cputype.h > @@ -55,9 +55,10 @@ > > #define MPIDR_LEVEL_BITS 8 > #define MPIDR_LEVEL_MASK ((1 << MPIDR_LEVEL_BITS) - 1) > +#define MPIDR_LEVEL_SHIFT(level) (MPIDR_LEVEL_BITS * level) > > #define MPIDR_AFFINITY_LEVEL(mpidr, level) \ > - ((mpidr >> (MPIDR_LEVEL_BITS * level)) & MPIDR_LEVEL_MASK) > + ((level < 3) ? ((mpidr >> MPIDR_LEVEL_SHIFT(level)) & MPIDR_LEVEL_MASK) > : 0) Instead of using a conditional here, you could just apply the MPIDR_HWID_BITMASK to the mpidr argument instead. > > #define ARM_CPU_IMP_ARM 0x41 > #define ARM_CPU_IMP_INTEL 0x69 > -- > 1.7.9.5 > _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
