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| author | Michael Ellerman <mpe@ellerman.id.au> | 2016-03-24 14:04:04 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-04-14 08:47:06 +0300 |
| commit | 5d31a96e6c0187f2c5d7004e005fd094a1277e9e (patch) | |
| tree | 5d2bf3efea21bedf6a0df86b66f4c420fd06190e /arch/powerpc/include/asm/thread_info.h | |
| parent | f63e6d89876034c21ecd18bb1cd0d6c5b8da11a5 (diff) | |
| download | linux-5d31a96e6c0187f2c5d7004e005fd094a1277e9e.tar.xz | |
powerpc/livepatch: Add livepatch stack to struct thread_info
In order to support live patching we need to maintain an alternate
stack of TOC & LR values. We use the base of the stack for this, and
store the "live patch stack pointer" in struct thread_info.
Unlike the other fields of thread_info, we can not statically initialise
that value, so it must be done at run time.
This patch just adds the code to support that, it is not enabled until
the next patch which actually adds live patch support.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Balbir Singh <bsingharora@gmail.com>
Diffstat (limited to 'arch/powerpc/include/asm/thread_info.h')
| -rw-r--r-- | arch/powerpc/include/asm/thread_info.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h index 7efee4a3240b..8febc3f66d53 100644 --- a/arch/powerpc/include/asm/thread_info.h +++ b/arch/powerpc/include/asm/thread_info.h @@ -43,7 +43,9 @@ struct thread_info { int preempt_count; /* 0 => preemptable, <0 => BUG */ unsigned long local_flags; /* private flags for thread */ - +#ifdef CONFIG_LIVEPATCH + unsigned long *livepatch_sp; +#endif /* low level flags - has atomic operations done on it */ unsigned long flags ____cacheline_aligned_in_smp; }; |