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authorSandipan Das <sandipan@linux.vnet.ibm.com>2017-10-10 09:45:30 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2017-10-10 12:16:32 +0300
commitb0490a04e736356e427e227902b17f9927a56caf (patch)
treedc96af57600fdc47d874e933103265e4dff79233 /arch/powerpc/mm/numa.c
parente36a82ee4c514a2f4f8fa30c780ad059282f5d64 (diff)
downloadlinux-b0490a04e736356e427e227902b17f9927a56caf.tar.xz
powerpc/lib/sstep: Fix count leading zeros instructions
According to the GCC documentation, the behaviour of __builtin_clz() and __builtin_clzl() is undefined if the value of the input argument is zero. Without handling this special case, these builtins have been used for emulating the following instructions: * Count Leading Zeros Word (cntlzw[.]) * Count Leading Zeros Doubleword (cntlzd[.]) This fixes the emulated behaviour of these instructions by adding an additional check for this special case. Fixes: 3cdfcbfd32b9d ("powerpc: Change analyse_instr so it doesn't modify *regs") Signed-off-by: Sandipan Das <sandipan@linux.vnet.ibm.com> Reviewed-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm/numa.c')
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