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| author | Will Deacon <will.deacon@arm.com> | 2015-07-28 20:07:28 +0200 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2015-07-30 20:07:28 +0200 |
| commit | ef5e724b25c9f90b7683bb2d45833ebac0989dcb (patch) | |
| tree | ba29fb37e3442b0bba787ed1edbb23c7b30f45d6 /arch/arm64/include/asm/cmpxchg.h | |
| parent | arm64/Documentation: clarify wording regarding memory below the Image (diff) | |
| download | linux-ef5e724b25c9f90b7683bb2d45833ebac0989dcb.tar.xz linux-ef5e724b25c9f90b7683bb2d45833ebac0989dcb.zip | |
arm64: alternative: put secondary CPUs into polling loop during patch
When patching the kernel text with alternatives, we may end up patching
parts of the stop_machine state machine (e.g. atomic_dec_and_test in
ack_state) and consequently corrupt the instruction stream of any
secondary CPUs.
This patch passes the cpu_online_mask to stop_machine, forcing all of
the CPUs into our own callback which can place the secondary cores into
a dumb (but safe!) polling loop whilst the patching is carried out.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/cmpxchg.h')
0 files changed, 0 insertions, 0 deletions