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powerpc: Apply early paca fixups to boot_paca and the boot cpu's paca
In commit 466921c
we added a hack to set the paca data_offset to zero so
that per-cpu accesses would work on the boot cpu prior to per-cpu areas
being setup. This fixed a problem with lockdep touching per-cpu areas
very early in boot.
However if we combine CONFIG_LOCK_STAT=y with any of the PPC_EARLY_DEBUG
options, we can hit the same problem in udbg_early_init(). To avoid that
we need to set the data_offset of the boot_paca also. So factor out the
fixup logic and call it for both the boot_paca, and "the paca of the
boot cpu".
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Tested-by: Geoff Levand <geoff@infradead.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
parent
6a7e406419
commit
25e138149c
@ -156,6 +156,15 @@ early_param("smt-enabled", early_smt_enabled);
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#define check_smt_enabled()
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#endif /* CONFIG_SMP */
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/** Fix up paca fields required for the boot cpu */
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static void fixup_boot_paca(void)
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{
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/* The boot cpu is started */
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get_paca()->cpu_start = 1;
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/* Allow percpu accesses to work until we setup percpu data */
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get_paca()->data_offset = 0;
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}
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/*
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* Early initialization entry point. This is called by head.S
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* with MMU translation disabled. We rely on the "feature" of
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@ -187,6 +196,7 @@ void __init early_setup(unsigned long dt_ptr)
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/* Assume we're on cpu 0 for now. Don't write to the paca yet! */
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initialise_paca(&boot_paca, 0);
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setup_paca(&boot_paca);
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fixup_boot_paca();
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/* Initialize lockdep early or else spinlocks will blow */
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lockdep_init();
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@ -207,11 +217,7 @@ void __init early_setup(unsigned long dt_ptr)
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/* Now we know the logical id of our boot cpu, setup the paca. */
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setup_paca(&paca[boot_cpuid]);
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/* Fix up paca fields required for the boot cpu */
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get_paca()->cpu_start = 1;
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/* Allow percpu accesses to "work" until we setup percpu data */
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get_paca()->data_offset = 0;
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fixup_boot_paca();
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/* Probe the machine type */
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probe_machine();
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