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authorMichael Ellerman <mpe@ellerman.id.au>2018-03-31 12:57:10 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2018-03-31 16:47:38 +0300
commit1d0afc0d5a7c281f8ced3bd39f61f3328d5d3822 (patch)
tree7c65dd8321b532d05cab7f707e540b9b56e975f8 /arch/powerpc/platforms/embedded6xx
parentca9a16c3bc1582da62ef9c47fc22008447f7ae0e (diff)
downloadlinux-1d0afc0d5a7c281f8ced3bd39f61f3328d5d3822.tar.xz
powerpc/64e: Fix oops due to deferral of paca allocation
On 64-bit Book3E systems, in setup_tlb_core_data() we reference other CPUs pacas. But in commit 59f577743d71 ("powerpc/64: Defer paca allocation until memory topology is discovered") the allocation of non-boot-CPU pacas was deferred until later in boot. This leads to an oops: CPU maps initialized for 1 thread per core Unable to handle kernel paging request for data at address 0x8888888888888918 Faulting instruction address: 0xc000000000e2f0d0 Oops: Kernel access of bad area, sig: 11 [#1] NIP .setup_tlb_core_data+0xdc/0x160 Call Trace: .setup_tlb_core_data+0x5c/0x160 (unreliable) .setup_arch+0x80/0x348 .start_kernel+0x7c/0x598 start_here_common+0x1c/0x40 Luckily setup_tlb_core_data() is called immediately prior to smp_setup_pacas(). So simply switching their order is sufficient to fix the oops and seems unlikely to have any other unwanted side effects. Fixes: 59f577743d71 ("powerpc/64: Defer paca allocation until memory topology is discovered") Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/platforms/embedded6xx')
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