powerpc/32: Fix crash during static key init

We cannot do those initializations from apply_feature_fixups() as
this function runs in a very restricted environment on 32-bit where
the kernel isn't running at its linked address and the PTRRELOC()
macro must be used for any global accesss.

Instead, split them into a separtate steup_feature_keys() function
which is called in a more suitable spot on ppc32.

Fixes: 309b315b6e ("powerpc: Call jump_label_init() in apply_feature_fixups()")
Reported-and-tested-by: Christian Kujau <lists@nerdbynature.de>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Benjamin Herrenschmidt 2016-08-10 17:27:34 +10:00 committed by Michael Ellerman
parent f9cc1d1f80
commit 97f6e0cc35
4 changed files with 8 additions and 0 deletions

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@ -186,6 +186,7 @@ label##3: \
#ifndef __ASSEMBLY__
void apply_feature_fixups(void);
void setup_feature_keys(void);
#endif
#endif /* __ASM_POWERPC_FEATURE_FIXUPS_H */

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@ -100,6 +100,9 @@ extern unsigned int memset_nocache_branch; /* Insn to be replaced by NOP */
notrace void __init machine_init(u64 dt_ptr)
{
/* Configure static keys first, now that we're relocated. */
setup_feature_keys();
/* Enable early debugging if any specified (see udbg.h) */
udbg_early_init();

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@ -300,6 +300,7 @@ void __init early_setup(unsigned long dt_ptr)
/* Apply all the dynamic patching */
apply_feature_fixups();
setup_feature_keys();
/* Initialize the hash table or TLB handling */
early_init_mmu();

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@ -188,7 +188,10 @@ void __init apply_feature_fixups(void)
&__start___fw_ftr_fixup, &__stop___fw_ftr_fixup);
#endif
do_final_fixups();
}
void __init setup_feature_keys(void)
{
/*
* Initialise jump label. This causes all the cpu/mmu_has_feature()
* checks to take on their correct polarity based on the current set of