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powerpc: Select ARCH_HAS_MEMBARRIER_SYNC_CORE

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powerpc return from interrupt and return from system call sequences
are context synchronising.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200716013522.338318-1-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin
2020-07-16 11:35:22 +10:00
committed by Michael Ellerman
parent 147c13413c
commit 2384b36f91
5 changed files with 22 additions and 3 deletions
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6
arch/powerpc/kernel/entry_32.S
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@@ -35,6 +35,12 @@
#include "head_32.h"
/*
* powerpc relies on return from interrupt/syscall being context synchronising
* (which rfi is) to support ARCH_HAS_MEMBARRIER_SYNC_CORE without additional
* synchronisation instructions.
*/
/*
* Align to 4k in order to ensure that all functions modyfing srr0/srr1
* fit into one page in order to not encounter a TLB miss between the