From bba226006469ef51f310f21b4ef0c6ec833bb98b Mon Sep 17 00:00:00 2001
From: Hugh Dickins <hughd@google.com>
Date: Sat, 4 Nov 2017 18:43:06 -0700
Subject: [PATCH] kaiser: kaiser_flush_tlb_on_return_to_user() check PCID

Let kaiser_flush_tlb_on_return_to_user() do the X86_FEATURE_PCID
check, instead of each caller doing it inline first: nobody needs
to optimize for the noPCID case, it's clearer this way, and better
suits later changes.  Replace those no-op X86_CR3_PCID_KERN_FLUSH lines
by a BUILD_BUG_ON() in load_new_mm_cr3(), in case something changes.

(cherry picked from Change-Id: I9b528ed9d7c1ae4a3b4738c2894ee1740b6fb0b9)

Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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