| Message ID | 20190514122456.28559-10-julien.grall@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | xen/arm: Clean-up & fixes in boot/mm code | expand |
On Tue, 14 May 2019, Julien Grall wrote: > There are no reason to consider the HW CPU ID will be 0 when the > processor is part of a uniprocessor system. At best, this will result to > conflicting output as the rest of Xen use the value directly read from > MPIDR_EL1. > > So remove the zeroing and logic to check if the CPU is part of a > uniprocessor system. > > Signed-off-by: Julien Grall <julien.grall@arm.com> > Reviewed-by: Andrii Anisov <andrii_anisov@epam.com> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org> > --- > Changes in v2: > - Add Andrii's reviewed-by > --- > xen/arch/arm/arm64/head.S | 6 ------ > 1 file changed, 6 deletions(-) > > diff --git a/xen/arch/arm/arm64/head.S b/xen/arch/arm/arm64/head.S > index b957eb90fb..08094a273e 100644 > --- a/xen/arch/arm/arm64/head.S > +++ b/xen/arch/arm/arm64/head.S > @@ -277,15 +277,9 @@ GLOBAL(init_secondary) > mov x26, #1 /* X26 := skip_zero_bss */ > > common_start: > - mov x24, #0 /* x24 := CPU ID. Initialy zero until we > - * find that multiprocessor extensions are > - * present and the system is SMP */ > mrs x0, mpidr_el1 > - tbnz x0, _MPIDR_UP, 1f /* Uniprocessor system? */ > - > ldr x13, =(~MPIDR_HWID_MASK) > bic x24, x0, x13 /* Mask out flags to get CPU ID */ > -1: > > /* Non-boot CPUs wait here until __cpu_up is ready for them */ > cbz x22, 1f > -- > 2.11.0 >
diff --git a/xen/arch/arm/arm64/head.S b/xen/arch/arm/arm64/head.S index b957eb90fb..08094a273e 100644 --- a/xen/arch/arm/arm64/head.S +++ b/xen/arch/arm/arm64/head.S @@ -277,15 +277,9 @@ GLOBAL(init_secondary) mov x26, #1 /* X26 := skip_zero_bss */ common_start: - mov x24, #0 /* x24 := CPU ID. Initialy zero until we - * find that multiprocessor extensions are - * present and the system is SMP */ mrs x0, mpidr_el1 - tbnz x0, _MPIDR_UP, 1f /* Uniprocessor system? */ - ldr x13, =(~MPIDR_HWID_MASK) bic x24, x0, x13 /* Mask out flags to get CPU ID */ -1: /* Non-boot CPUs wait here until __cpu_up is ready for them */ cbz x22, 1f