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arm64: entry: Remove confusing comment

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The comment about SYS_MEMBARRIER_SYNC_CORE relying on ERET being
context-synchronizing is confusing and misplaced with kpti. Given that
this is already documented under Documentation/ (see arch-support.txt
for membarrier), remove the comment altogether.

Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2018-06-19 14:08:24 +01:00
parent 679db70801
commit 8cb3451b1f
1 changed files with 0 additions and 4 deletions
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4
arch/arm64/kernel/entry.S
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@ -344,10 +344,6 @@ alternative_else_nop_endif
ldp x28, x29, [sp, #16 * 14]
ldr lr, [sp, #S_LR]
add sp, sp, #S_FRAME_SIZE // restore sp
/*
* ARCH_HAS_MEMBARRIER_SYNC_CORE rely on eret context synchronization
* when returning from IPI handler, and when returning to user-space.
*/
.if \el == 0
alternative_insn eret, nop, ARM64_UNMAP_KERNEL_AT_EL0