Commit 8cb3451b authored Jun 19, 2018 by Will Deacon

arm64: entry: Remove confusing comment



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>

parent 679db708

arch/arm64/kernel/entry.S

+0 −4

Original line number	Diff line number	Diff line
		@@ -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