arm64: big-endian: write CPU holding pen address as LE

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Currently when CPUs are brought online via a spin-table, the address
they should jump to is written to the cpu-release-addr in the kernel's
native endianness. As the kernel may switch endianness, secondaries
might read the value byte-reversed from what was intended, and they
would jump to the wrong address.

As the only current arm64 spin-table implementations are
little-endian, stricten up the arm64 spin-table definition such that
the value written to cpu-release-addr is _always_ little-endian
regardless of the endianness of any CPU. If a spinning CPU is
operating big-endian, it must byte-reverse the value before jumping to
handle this.

Signed-off-by: Matthew Leach <matthew.leach@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Matthew Leach 2013-10-11 14:52:18 +01:00 • committed by Catalin Marinas

parent 9cf7172893

commit 710be9ac4e

1 changed files with 10 additions and 1 deletions

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arch/arm64/kernel/smp_spin_table.c

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