linux-kernel - Re: [PATCH] mips: Fix gettimeofday() in the vdso library

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Message-Id: <DCD7A17F-B045-440E-AB66-7F8AB72A19CA@goldelico.com>
Date:   Fri, 29 Nov 2019 16:09:51 +0100
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Vincenzo Frascino <vincenzo.frascino@....com>
Cc:     Paul Burton <paulburton@...nel.org>,
        mips-creator-ci20-dev@...glegroups.com,
        letux-kernel@...nphoenux.org, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mips: Fix gettimeofday() in the vdso library


> Am 29.11.2019 um 15:58 schrieb Vincenzo Frascino <vincenzo.frascino@....com>:
> 
> On 11/29/19 2:52 PM, H. Nikolaus Schaller wrote:
>> 
>>> Am 29.11.2019 um 15:36 schrieb Vincenzo Frascino <vincenzo.frascino@....com>:
>>> 
>>> The libc provides a discovery mechanism for vDSO library and its
>>> symbols. When a symbol is not exposed by the vDSOs the libc falls back
>>> on the system calls.
>>> 
>>> With the introduction of the unified vDSO library on mips this behavior
>>> is not honored anymore by the kernel in the case of gettimeofday().
>>> 
>>> The issue has been noticed and reported due to a dhclient failure on the
>>> CI20 board:
>>> 
>>> root@...ux:~# dhclient
>>> ../../../../lib/isc/unix/time.c:200: Operation not permitted
>>> root@...ux:~#
>>> 
>>> Restore the original behavior fixing gettimeofday() in the vDSO library.
>>> 
>>> Cc: Paul Burton <paulburton@...nel.org>
>>> Reported-by: H. Nikolaus Schaller <hns@...delico.com>
>>> Testes-by: H. Nikolaus Schaller <hns@...delico.com> # CI20 with JZ4780
>> ^^^ funny typo... -> Tested-by:
> 
> Ops, I copy-pasted it from your email ;) Can't trust you ;)

No :)

Well, typos happen and nobody seems to notice. My favourite:

5f9e832c137075045d15cd6899ab0505cfb2ca4b

BR,
Nikolaus