linux-kernel - Re: [PATCH] lib/vdso: guard clockid before building u32 bitmask

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Message-ID: <CABFUUZGPS2bsPdRygY6votx-YMTaiYtmBg0nW94Qhjdi31secA@mail.gmail.com>
Date: Wed, 14 Jan 2026 18:26:17 +0800
From: sun jian <sun.jian.kdev@...il.com>
To: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Cc: Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...nel.org>, 
	Vincenzo Frascino <vincenzo.frascino@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lib/vdso: guard clockid before building u32 bitmask

On Wed, Jan 14, 2026 at 5:53 PM Thomas Weißschuh
<thomas.weissschuh@...utronix.de> wrote:
> On which specific kernel commit are you?
I'm on:
  b71e635feefc852405b14620a7fc58c4c80c0f73
  ("Merge tag 'cgroup-for-6.19-rc5-fixes'")
, no tags available.
> The message points to '} else if (msg & VDSO_AUX) {'. This means that it probably
> complains about the shift in '#define VDSO_AUX __GENMASK(CLOCK_AUX_LAST, CLOCK_AUX)'.
> We had problems in that area before, so I'd like to get all the details.
>
> Which sparse version are you using?
Sparse version:

  v0.6.4-73-gfbdde312

The warning was reproduced with gcc + CHECK=sparse on x86, via the vdso32
include path (arch/x86/entry/vdso/vdso32/vclock_gettime.c).

Thanks,
Sun