linux-kernel - Re: [PATCH 4/4] vdso: avoid including asm/page.h

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Date: Tue, 27 Feb 2024 13:46:40 +0000
From: Catalin Marinas <catalin.marinas@....com>
To: Arnd Bergmann <arnd@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>,
	Vincenzo Frascino <vincenzo.frascino@....com>,
	Kees Cook <keescook@...omium.org>,
	Anna-Maria Behnsen <anna-maria@...utronix.de>,
	Arnd Bergmann <arnd@...db.de>, Matt Turner <mattst88@...il.com>,
	Vineet Gupta <vgupta@...nel.org>,
	Russell King <linux@...linux.org.uk>, Guo Ren <guoren@...nel.org>,
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	Linux Kernel Functional Testing <lkft@...aro.org>
Subject: Re: [PATCH 4/4] vdso: avoid including asm/page.h

On Mon, Feb 26, 2024 at 05:14:14PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The recent change to the vdso_data_store broke building compat VDSO
> on at least arm64 because it includes headers outside of the include/vdso/
> namespace:
> 
> In file included from arch/arm64/include/asm/lse.h:5,
>                  from arch/arm64/include/asm/cmpxchg.h:14,
>                  from arch/arm64/include/asm/atomic.h:16,
>                  from include/linux/atomic.h:7,
>                  from include/asm-generic/bitops/atomic.h:5,
>                  from arch/arm64/include/asm/bitops.h:25,
>                  from include/linux/bitops.h:68,
>                  from arch/arm64/include/asm/memory.h:209,
>                  from arch/arm64/include/asm/page.h:46,
>                  from include/vdso/datapage.h:22,
>                  from lib/vdso/gettimeofday.c:5,
>                  from <command-line>:
> arch/arm64/include/asm/atomic_ll_sc.h:298:9: error: unknown type name 'u128'
>   298 |         u128 full;
> 
> Use an open-coded page size calculation based on the new CONFIG_PAGE_SHIFT
> Kconfig symbol instead.
> 
> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
> Fixes: a0d2fcd62ac2 ("vdso/ARM: Make union vdso_data_store available for all architectures")
> Link: https://lore.kernel.org/lkml/CA+G9fYtrXXm_KO9fNPz3XaRxHV7UD_yQp-TEuPQrNRHU+_0W_Q@mail.gmail.com/
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Acked-by: Catalin Marinas <catalin.marinas@....com>