linux-kernel - Re: [PATCH v3 2/2] vdso: Introduce vdso/page.h

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Message-ID: <87ttdlr3s5.ffs@tglx>
Date: Wed, 09 Oct 2024 12:04:10 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Vincenzo Frascino <vincenzo.frascino@....com>,
 linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
 linux-mm@...ck.org
Cc: Vincenzo Frascino <vincenzo.frascino@....com>, Andy Lutomirski
 <luto@...nel.org>, "Jason A . Donenfeld" <Jason@...c4.com>, Christophe
 Leroy <christophe.leroy@...roup.eu>, Michael Ellerman <mpe@...erman.id.au>,
 Nicholas Piggin <npiggin@...il.com>, Naveen N Rao <naveen@...nel.org>,
 Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave
 Hansen <dave.hansen@...ux.intel.com>, "H . Peter
 Anvin" <hpa@...or.com>, Theodore Ts'o <tytso@....edu>, Arnd Bergmann
 <arnd@...db.de>, Andrew Morton <akpm@...ux-foundation.org>, Steven Rostedt
 <rostedt@...dmis.org>, Masami Hiramatsu <mhiramat@...nel.org>, Mathieu
 Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: [PATCH v3 2/2] vdso: Introduce vdso/page.h

On Wed, Oct 09 2024 at 11:53, Thomas Gleixner wrote:
> On Thu, Oct 03 2024 at 16:29, Vincenzo Frascino wrote:

Hit send too early.

>> +#if defined(CONFIG_PHYS_ADDR_T_64BIT)
>> +#define PAGE_MASK	(~((1 << CONFIG_PAGE_SHIFT) - 1))

This really wants a comment. The magic reliance on integer sign
expansion is any thing than obvious.

Thanks,

         tglx