linux-kernel - Re: [PATCH] mm/vmalloc: Check absolute error return from vmap_[p4d|pud|pmd|pte]

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Message-ID: <20190613153141.GJ32656@bombadil.infradead.org>
Date:   Thu, 13 Jun 2019 08:31:41 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Anshuman Khandual <anshuman.khandual@....com>
Cc:     Roman Penyaev <rpenyaev@...e.de>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Rick Edgecombe <rick.p.edgecombe@...el.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Roman Gushchin <guro@...com>, Michal Hocko <mhocko@...e.com>,
        "Uladzislau Rezki (Sony)" <urezki@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] mm/vmalloc: Check absolute error return from
 vmap_[p4d|pud|pmd|pte]_range()

On Thu, Jun 13, 2019 at 08:51:17PM +0530, Anshuman Khandual wrote:
> acceptable ? What we have currently is wrong where vmap_pmd_range() could
> just wrap EBUSY as ENOMEM and send up the call chain.

It's not wrong.  We do it in lots of places.  Unless there's a caller
which really needs to know the difference, it's often better than
returning the "real error".