powerpc: Add helper to check if offset is within relative branch range
authorAnju T <anju@linux.vnet.ibm.com>
Wed, 8 Feb 2017 08:57:30 +0000 (14:27 +0530)
committerMichael Ellerman <mpe@ellerman.id.au>
Fri, 10 Feb 2017 02:28:03 +0000 (13:28 +1100)
commitebfa50df435eed18e1389a43e0596246228e7298
treea901e3284d4bd0e26e541f39f873c6292f7862ba
parentc233f5979b3dbb39a5b2473b5fcaf58baec8f1bd
powerpc: Add helper to check if offset is within relative branch range

To permit the use of relative branch instruction in powerpc, the target
address has to be relatively nearby, since the address is specified in an
immediate field (24 bit filed) in the instruction opcode itself. Here
nearby refers to 32MB on either side of the current instruction.

This patch verifies whether the target address is within +/- 32MB
range or not.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Anju T Sudhakar <anju@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
arch/powerpc/include/asm/code-patching.h
arch/powerpc/lib/code-patching.c