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authorMichael Ellerman <mpe@ellerman.id.au>2016-06-20 19:23:43 +1000
committerMichael Ellerman <mpe@ellerman.id.au>2016-06-23 09:58:17 +1000
commit6e914ee629c411d9c6d160399ce7d3472d2c0ec7 (patch)
treec6a926d38f595258cd713b3abb483f77a0f67ed9 /Documentation
parenta3aa256b7258b3d19f8b44557cc64525a993b941 (diff)
powerpc: Fix faults caused by radix patching of SLB miss handler
As part of the Radix MMU support we added some feature sections in the SLB miss handler. These are intended to catch the case that we incorrectly take an SLB miss when Radix is enabled, and instead of crashing weirdly they bail out to a well defined exit path and trigger an oops. However the way they were written meant the bailout case was enabled by default until we did CPU feature patching. On powermacs the early debug prints in setup_system() can cause an SLB miss, which happens before code patching, and so the SLB miss handler would incorrectly bailout and crash during boot. Fix it by inverting the sense of the feature section, so that the code which is in place at boot is correct for the hash case. Once we determine we are using Radix - which will never happen on a powermac - only then do we patch in the bailout case which unconditionally jumps. Fixes: caca285e5ab4 ("powerpc/mm/radix: Use STD_MMU_64 to properly isolate hash related code") Reported-by: Denis Kirjanov <kda@linux-powerpc.org> Tested-by: Denis Kirjanov <kda@linux-powerpc.org> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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