linux-kernel - Re: [PATCH v8 20/24] erofs: introduce generic decompression backend

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Message-ID: <20190830163534.GA29603@infradead.org>
Date:   Fri, 30 Aug 2019 09:35:34 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Gao Xiang <gaoxiang25@...wei.com>
Cc:     linux-fsdevel@...r.kernel.org, devel@...verdev.osuosl.org,
        Alexander Viro <viro@...iv.linux.org.uk>,
        LKML <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Theodore Ts'o <tytso@....edu>, Pavel Machek <pavel@...x.de>,
        David Sterba <dsterba@...e.cz>,
        Amir Goldstein <amir73il@...il.com>,
        Christoph Hellwig <hch@...radead.org>,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        Dave Chinner <david@...morbit.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>, Jan Kara <jack@...e.cz>,
        Richard Weinberger <richard@....at>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-erofs@...ts.ozlabs.org, Chao Yu <yuchao0@...wei.com>,
        Miao Xie <miaoxie@...wei.com>,
        Li Guifu <bluce.liguifu@...wei.com>,
        Fang Wei <fangwei1@...wei.com>
Subject: Re: [PATCH v8 20/24] erofs: introduce generic decompression backend

On Thu, Aug 15, 2019 at 12:41:51PM +0800, Gao Xiang wrote:
> +static bool use_vmap;
> +module_param(use_vmap, bool, 0444);
> +MODULE_PARM_DESC(use_vmap, "Use vmap() instead of vm_map_ram() (default 0)");

And how would anyone know which to pick?