linux-kernel - Re: [PATCH v7] mremap.2: Add information for MREMAP

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Date:   Tue, 25 Feb 2020 14:51:34 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Brian Geffon <bgeffon@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     "Michael S . Tsirkin" <mst@...hat.com>,
        Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-api@...r.kernel.org,
        Andy Lutomirski <luto@...capital.net>,
        Will Deacon <will@...nel.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Sonny Rao <sonnyrao@...gle.com>,
        Minchan Kim <minchan@...nel.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Yu Zhao <yuzhao@...gle.com>,
        Jesse Barnes <jsbarnes@...gle.com>,
        Florian Weimer <fweimer@...hat.com>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        mtk.manpages@...il.com, linux-man@...r.kernel.org
Subject: Re: [PATCH v7] mremap.2: Add information for MREMAP_DONTUNMAP.

On 2/21/20 6:42 PM, Brian Geffon wrote:
> @@ -209,10 +227,20 @@ flag was not specified.
>  .RE
>  .TP
>  .B ENOMEM
> +Not enough memory was available to complete the operation.
> +Possible causes are:
> +.RS
> +.IP * 3
>  The memory area cannot be expanded at the current virtual address, and the
>  .B MREMAP_MAYMOVE
>  flag is not set in \fIflags\fP.
>  Or, there is not enough (virtual) memory available.
> +.IP *
> +.B MREMAP_DONTUNMAP
> +was used without
> +.B MREMAP_FIXED
> +causing a new mapping to be created that would exceed the virtual memory available or it would exceed the maximum number of allowed mappings.

So this can also result with MREMAP_FIXED, no?

> +.RE
>  .SH CONFORMING TO
>  This call is Linux-specific, and should not be used in programs
>  intended to be portable.
>