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powerpc/prom: early_init_dt_scan_cpus() updates cpu features only once

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All our cpu feature updates were done for every CPU in the device-tree,
thus overwriting the cputable bits over and over again. Instead do them
only for the boot CPU.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt 2014-03-28 13:36:28 +11:00
parent 36ae37e343
commit 7222f779ac
1 changed files with 26 additions and 26 deletions
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52
arch/powerpc/kernel/prom.c
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@ -347,33 +347,34 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
#endif
}
if (found >= 0) {
DBG("boot cpu: logical %d physical %d\n", found,
be32_to_cpu(intserv[found_thread]));
boot_cpuid = found;
set_hard_smp_processor_id(found,
be32_to_cpu(intserv[found_thread]));
/* Not the boot CPU */
if (found < 0)
return 0;
/*
* PAPR defines "logical" PVR values for cpus that
* meet various levels of the architecture:
* 0x0f000001 Architecture version 2.04
* 0x0f000002 Architecture version 2.05
* If the cpu-version property in the cpu node contains
* such a value, we call identify_cpu again with the
* logical PVR value in order to use the cpu feature
* bits appropriate for the architecture level.
*
* A POWER6 partition in "POWER6 architected" mode
* uses the 0x0f000002 PVR value; in POWER5+ mode
* it uses 0x0f000001.
*/
prop = of_get_flat_dt_prop(node, "cpu-version", NULL);
if (prop && (be32_to_cpup(prop) & 0xff000000) == 0x0f000000)
identify_cpu(0, be32_to_cpup(prop));
DBG("boot cpu: logical %d physical %d\n", found,
be32_to_cpu(intserv[found_thread]));
boot_cpuid = found;
set_hard_smp_processor_id(found, be32_to_cpu(intserv[found_thread]));
identical_pvr_fixup(node);
}
/*
* PAPR defines "logical" PVR values for cpus that
* meet various levels of the architecture:
* 0x0f000001 Architecture version 2.04
* 0x0f000002 Architecture version 2.05
* If the cpu-version property in the cpu node contains
* such a value, we call identify_cpu again with the
* logical PVR value in order to use the cpu feature
* bits appropriate for the architecture level.
*
* A POWER6 partition in "POWER6 architected" mode
* uses the 0x0f000002 PVR value; in POWER5+ mode
* it uses 0x0f000001.
*/
prop = of_get_flat_dt_prop(node, "cpu-version", NULL);
if (prop && (be32_to_cpup(prop) & 0xff000000) == 0x0f000000)
identify_cpu(0, be32_to_cpup(prop));
identical_pvr_fixup(node);
check_cpu_feature_properties(node);
check_cpu_pa_features(node);
@ -385,7 +386,6 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
else
cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
#endif
return 0;
}