powerpc: Fix boot on BOOK3S_32 with CONFIG_STRICT_KERNEL_RWX

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commit 252eb55816 upstream.

On powerpc32, patch_instruction() is called by apply_feature_fixups()
which is called from early_init()

There is the following note in front of early_init():
 * Note that the kernel may be running at an address which is different
 * from the address that it was linked at, so we must use RELOC/PTRRELOC
 * to access static data (including strings).  -- paulus

Therefore, slab_is_available() cannot be called yet, and
text_poke_area must be addressed with PTRRELOC()

Fixes: 95902e6c88 ("powerpc/mm: Implement STRICT_KERNEL_RWX on PPC32")
Reported-by: Meelis Roos <mroos@linux.ee>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Christophe Leroy 2017-11-21 15:28:20 +01:00 • committed by Greg Kroah-Hartman

parent c7311af0e2

commit df4d69feaf

1 changed files with 2 additions and 4 deletions

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arch/powerpc/lib/code-patching.c

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