linux-kernel - Re: [PATCH 2/2] Fixup for 3279be36b671 ("powerpc/vdso: Wire up getrandom() vDSO implementation on VDSO32")

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Message-ID: <ZtsMpcV7iLYoytdJ@zx2c4.com>
Date: Fri, 6 Sep 2024 16:07:33 +0200
From: "Jason A. Donenfeld" <Jason@...c4.com>
To: Christophe Leroy <christophe.leroy@...roup.eu>
Cc: linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	Michael Ellerman <mpe@...erman.id.au>,
	Nicholas Piggin <npiggin@...il.com>,
	Naveen N Rao <naveen@...nel.org>,
	Vincenzo Frascino <vincenzo.frascino@....com>,
	Andrei Vagin <avagin@...il.com>
Subject: Re: [PATCH 2/2] Fixup for 3279be36b671 ("powerpc/vdso: Wire up
 getrandom() vDSO implementation on VDSO32")

On Fri, Sep 06, 2024 at 10:33:44AM +0200, Christophe Leroy wrote:
> Use the new get_realdatapage macro instead of get_datapage
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
> ---
>  arch/powerpc/kernel/vdso/getrandom.S | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/kernel/vdso/getrandom.S b/arch/powerpc/kernel/vdso/getrandom.S
> index a957cd2b2b03..f3bbf931931c 100644
> --- a/arch/powerpc/kernel/vdso/getrandom.S
> +++ b/arch/powerpc/kernel/vdso/getrandom.S
> @@ -31,7 +31,7 @@
>  	PPC_STL		r2, PPC_MIN_STKFRM + STK_GOT(r1)
>    .cfi_rel_offset r2, PPC_MIN_STKFRM + STK_GOT
>  #endif
> -	get_datapage	r8
> +	get_realdatapage	r8, r11
>  	addi		r8, r8, VDSO_RNG_DATA_OFFSET
>  	bl		CFUNC(DOTSYM(\funct))
>  	PPC_LL		r0, PPC_MIN_STKFRM + PPC_LR_STKOFF(r1)

I tested that this is working as intended on powerpc, powerpc64, and
powerpc64le. Thanks for writing the patch so quickly.

Jason