powerpc/64: Add macros for annotating the destination of rfid/hrfid

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commit 50e51c13b3 upstream.

The rfid/hrfid ((Hypervisor) Return From Interrupt) instruction is
used for switching from the kernel to userspace, and from the
hypervisor to the guest kernel. However it can and is also used for
other transitions, eg. from real mode kernel code to virtual mode
kernel code, and it's not always clear from the code what the
destination context is.

To make it clearer when reading the code, add macros which encode the
expected destination context.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Nicholas Piggin 2018-01-10 03:07:15 +11:00 • committed by Greg Kroah-Hartman

parent 4167dcbc91

commit bcba6b9024

2 changed files with 35 additions and 0 deletions

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6

arch/powerpc/include/asm/exception-64e.h

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29

arch/powerpc/include/asm/exception-64s.h

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