x86/mm: Change the leave_mm() condition for local TLB flushes
authorAndy Lutomirski <luto@kernel.org>
Sun, 28 May 2017 17:00:11 +0000 (10:00 -0700)
committerIngo Molnar <mingo@kernel.org>
Mon, 5 Jun 2017 07:59:42 +0000 (09:59 +0200)
commit59f537c1dea04287165bb11407921e095250dc80
treef06ab259d3c2b09cb2f50f8753aca7f99ff64ae1
parenta2055abe9c6789cedef29abbdaa488a087faccc3
x86/mm: Change the leave_mm() condition for local TLB flushes

On a remote TLB flush, we leave_mm() if we're TLBSTATE_LAZY.  For a
local flush_tlb_mm_range(), we leave_mm() if !current->mm.  These
are approximately the same condition -- the scheduler sets lazy TLB
mode when switching to a thread with no mm.

I'm about to merge the local and remote flush code, but for ease of
verifying and bisecting the patch, I want the local and remote flush
behavior to match first.  This patch changes the local code to match
the remote code.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Borislav Petkov <bpetkov@suse.de>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Nadav Amit <nadav.amit@gmail.com>
Cc: Nadav Amit <namit@vmware.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mm@kvack.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/mm/tlb.c