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| author | Gavin Shan <gwshan@linux.vnet.ibm.com> | 2015-01-08 08:40:51 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2015-01-23 06:02:52 +0300 |
| commit | 6f20e7f2e930211613a66d0603fa4abaaf3ce662 (patch) | |
| tree | 2d92f779d0d1e675b5289c176b1cda023fbebc9b /arch/powerpc/platforms | |
| parent | 53a448c3d5d721cd85e3ad3e38c222a4dbb17f13 (diff) | |
| download | linux-6f20e7f2e930211613a66d0603fa4abaaf3ce662.tar.xz | |
powerpc/kernel: Avoid memory corruption at early stage
When calling to early_setup(), we pick "boot_paca" up for the master CPU
and initialize that with initialise_paca(). At that point, the SLB
shadow buffer isn't populated yet. Updating the SLB shadow buffer should
corrupt what we had in physical address 0 where the trap instruction is
usually stored.
This hasn't been observed to cause any trouble in practice, but is
obviously fishy.
Fixes: 6f4441ef7009 ("powerpc: Dynamically allocate slb_shadow from memblock")
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/platforms')
0 files changed, 0 insertions, 0 deletions