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Message-ID: <e28e1974-cced-462c-8f57-ca1474272e73@arm.com> Date: Fri, 6 Sep 2024 12:20:31 +0100 From: Vincenzo Frascino <vincenzo.frascino@....com> To: Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org, Linux-Arch <linux-arch@...r.kernel.org>, linux-mm@...ck.org Cc: Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, "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>, 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 3/9] x86: vdso: Introduce asm/vdso/page.h Hi Arnd, On 04/09/2024 15:52, Arnd Bergmann wrote: > On Tue, Sep 3, 2024, at 15:14, Vincenzo Frascino wrote: > ... >> + >> +/* SPDX-License-Identifier: GPL-2.0 */ >> +#ifndef __ASM_VDSO_PAGE_H >> +#define __ASM_VDSO_PAGE_H >> + >> +#ifndef __ASSEMBLY__ >> + >> +#include <asm/page_types.h> >> + >> +#define VDSO_PAGE_MASK PAGE_MASK >> +#define VDSO_PAGE_SIZE PAGE_SIZE >> + >> +#endif /* !__ASSEMBLY__ */ >> + >> +#endif /* __ASM_VDSO_PAGE_H */ > > I don't get this one: the x86 asm/page_types.h still includes other > headers outside of the vdso namespace, but you seem to only need these > two definitions that are the same across everything. > > Why not put PAGE_MASK and PAGE_SIZE into a global vdso/page.h > header? I did spend a lot of time a few months ago ensuring that > we can have a single definition for all architectures based on > CONFIG_PAGE_SHIFT, so all the extra copies should just go away. > > Arnd Looking at the definition of PAGE_SIZE and PAGE_MASK for each architecture they all depend on CONFIG_PAGE_SHIFT but they are slightly different, e.g.: x86: #define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT) powerpc: #define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT) hence I left to the architecture the responsibility of redefining the constants for the VSDO. As a long term plan I would like to simplify the code and have a single definition as you are saying in vdso/page.h for both the macros. But my preference would be to post it as a separate series so that I can focus more on validating it properly. -- Regards, Vincenzo
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