linux-kernel - Re: [PATCH v2] syscalls: Cleanup references to sys_lookup

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Date:   Tue, 3 Oct 2023 10:47:06 -0700
From:   Sohil Mehta <sohil.mehta@...el.com>
To:     Arnd Bergmann <arnd@...db.de>, <linux-api@...r.kernel.org>,
        <linux-arch@...r.kernel.org>
CC:     Richard Henderson <richard.henderson@...aro.org>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        "Will Deacon" <will@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        "Michal Simek" <monstr@...str.eu>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "James E . J . Bottomley" <James.Bottomley@...senPartnership.com>,
        "Helge Deller" <deller@....de>,
        Michael Ellerman <mpe@...erman.id.au>,
        "Nicholas Piggin" <npiggin@...il.com>,
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Subject: Re: [PATCH v2] syscalls: Cleanup references to sys_lookup_dcookie()

Arnd, is this a good candidate for 6.7? Though old, the patch applies
cleanly on 6.6-rc4. I can re-send this one if you would prefer that.

On 8/3/2023 2:44 PM, Sohil Mehta wrote:
> On 7/10/2023 11:51 AM, Sohil Mehta wrote:
>> commit 'be65de6b03aa ("fs: Remove dcookies support")' removed the
>> syscall definition for lookup_dcookie.  However, syscall tables still
>> point to the old sys_lookup_dcookie() definition. Update syscall tables
>> of all architectures to directly point to sys_ni_syscall() instead.
>>
>> Signed-off-by: Sohil Mehta <sohil.mehta@...el.com>
>> Reviewed-by: Randy Dunlap <rdunlap@...radead.org>
>> Acked-by: Namhyung Kim <namhyung@...nel.org> # for perf
> 
> The patch has received a couple of additional Acks.
> 

Namely,

Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org>
Acked-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>

> Does this seem like a valuable cleanup? If so, should it go through the
> asm-generic tree?
> 

The main motivation here is to make readers aware upfront (via the
syscall table itself) that no implementation exists for lookup_dcookie
instead of them searching for one and realizing the same. The syscall
tables do something similar for _sysctl().

Please let me know if this change seems unnecessary. I can drop the
annoying pings in that case.

Thanks,
Sohil