From: Christoph Hellwig <hch@infradead.org>
To: Hoeun Ryu <hoeun.ryu@gmail.com>
Cc: Christoph Hellwig <hch@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Andreas Dilger <adilger@dilger.ca>,
Vlastimil Babka <vbabka@suse.cz>, Michal Hocko <mhocko@suse.com>,
Chris Wilson <chris@chris-wilson.co.uk>,
Ingo Molnar <mingo@kernel.org>, zijun_hu <zijun_hu@htc.com>,
Matthew Wilcox <mawilcox@microsoft.com>,
Thomas Garnier <thgarnie@google.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
linux-arch@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm: add VM_STATIC flag to vmalloc and prevent from removing the areas
Date: Wed, 12 Apr 2017 10:31:51 -0700 [thread overview]
Message-ID: <20170412173151.GA23054@infradead.org> (raw)
In-Reply-To: <AC5E3048-6E2B-4DBE-80BA-AAE2D3EED969@gmail.com>
On Wed, Apr 12, 2017 at 08:42:08PM +0900, Hoeun Ryu wrote:
>
> > On Apr 12, 2017, at 3:02 PM, Christoph Hellwig <hch@infradead.org> wrote:
> >
> >> On Wed, Apr 12, 2017 at 02:01:59PM +0900, Hoeun Ryu wrote:
> >> vm_area_add_early/vm_area_register_early() are used to reserve vmalloc area
> >> during boot process and those virtually mapped areas are never unmapped.
> >> So `OR` VM_STATIC flag to the areas in vmalloc_init() when importing
> >> existing vmlist entries and prevent those areas from being removed from the
> >> rbtree by accident.
> >
> > How would they be removed "by accident"?
>
> I don't mean actual use-cases, but I just want to make it robust against like programming errors.
Oh, ok. The patch makes sense then, although the changelog could use
a little update.
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next prev parent reply other threads:[~2017-04-12 17:32 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-12 5:01 [PATCH] mm: add VM_STATIC flag to vmalloc and prevent from removing the areas Hoeun Ryu
2017-04-12 6:02 ` Christoph Hellwig
2017-04-12 11:42 ` Hoeun Ryu
2017-04-12 17:31 ` Christoph Hellwig [this message]
2017-04-13 1:03 ` Ho-Eun Ryu
2017-04-13 4:17 ` Anshuman Khandual
2017-04-14 0:25 ` Hoeun Ryu
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