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From: "Kani, Toshi" <toshi.kani@hpe.com>
To: "tglx@linutronix.de" <tglx@linutronix.de>,
	"joro@8bytes.org" <joro@8bytes.org>,
	"mingo@redhat.com" <mingo@redhat.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"bp@suse.de" <bp@suse.de>,
	"willy@infradead.org" <willy@infradead.org>,
	"stable@vger.kernel.org" <stable@vger.kernel.org>,
	"x86@kernel.org" <x86@kernel.org>,
	"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
	"hpa@zytor.com" <hpa@zytor.com>,
	"Hocko, Michal" <MHocko@suse.com>,
	"jroedel@suse.de" <jroedel@suse.de>
Subject: Re: [PATCH] Revert "x86/mm: implement free pmd/pte page interfaces"
Date: Thu, 26 Apr 2018 16:29:45 +0000	[thread overview]
Message-ID: <1524760125.2693.468.camel@hpe.com> (raw)
In-Reply-To: <1524755647-18695-1-git-send-email-joro@8bytes.org>

On Thu, 2018-04-26 at 17:14 +0200, Joerg Roedel wrote:
> From: Joerg Roedel <jroedel@suse.de>
> 
> This reverts commit 28ee90fe6048fa7b7ceaeb8831c0e4e454a4cf89.
> 
> This commit is broken for x86, as it unmaps the PTE and PMD
> pages and immediatly frees them without doing a TLB flush.
> 
> Further this lacks synchronization with other page-tables in
> the system when the PMD pages are not shared between
> mm_structs.
> 
> On x86-32 with PAE and PTI patches on-top this patch
> triggers the BUG_ON in vmalloc_sync_one() because the kernel
> and the process page-table were not synchronized.
> 
> Signed-off-by: Joerg Roedel <jroedel@suse.de>

I do not agree with the comments and this revert.  Let's discuss further
on the original thread.

Thanks,
-Toshi

  parent reply	other threads:[~2018-04-26 16:29 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-26 15:14 Joerg Roedel
2018-04-26 15:27 ` Greg KH
2018-04-26 15:31   ` Joerg Roedel
2018-04-26 16:29 ` Kani, Toshi [this message]
2018-04-27  6:28   ` Ingo Molnar
2018-04-27 19:49     ` Kani, Toshi

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