linux-kernel - Re: linux-next: manual merge of the akpm-current tree with the tip tree

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Message-ID: <20170811093449.w5wttpulmwfykjzm@hirez.programming.kicks-ass.net>
Date:   Fri, 11 Aug 2017 11:34:49 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Nadav Amit <namit@...are.com>,
        Linus <torvalds@...ux-foundation.org>
Subject: Re: linux-next: manual merge of the akpm-current tree with the tip
 tree

On Fri, Aug 11, 2017 at 05:53:26PM +1000, Stephen Rothwell wrote:
> Hi all,
> 
> Today's linux-next merge of the akpm-current tree got conflicts in:
> 
>   include/linux/mm_types.h
>   mm/huge_memory.c
> 
> between commit:
> 
>   8b1b436dd1cc ("mm, locking: Rework {set,clear,mm}_tlb_flush_pending()")
> 
> from the tip tree and commits:
> 
>   16af97dc5a89 ("mm: migrate: prevent racy access to tlb_flush_pending")
>   a9b802500ebb ("Revert "mm: numa: defer TLB flush for THP migration as long as possible"")
> 
> from the akpm-current tree.
> 
> The latter 2 are now in Linus' tree as well (but were not when I started
> the day).
> 
> The only way forward I could see was to revert
> 
>   8b1b436dd1cc ("mm, locking: Rework {set,clear,mm}_tlb_flush_pending()")
> 
> and the three following commits
> 
>   ff7a5fb0f1d5 ("overlayfs, locking: Remove smp_mb__before_spinlock() usage")
>   d89e588ca408 ("locking: Introduce smp_mb__after_spinlock()")
>   a9668cd6ee28 ("locking: Remove smp_mb__before_spinlock()")
> 
> before merging the akpm-current tree again.

Here's two patches that apply on top of tip.


View attachment "nadav_amit-mm-migrate__prevent_racy_access_to_tlb_flush_pending.patch" of type "text/x-diff" (4923 bytes)

View attachment "nadav_amit-revert__mm-numa__defer_tlb_flush_for_thp_migration_as_long_as_possible_.patch" of type "text/x-diff" (2577 bytes)