linux-kernel - Re: [PATCH] powerpc/time: Force inlining of get

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Date:   Wed, 23 Dec 2020 00:11:24 +1100 (AEDT)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] powerpc/time: Force inlining of get_tb()

On Sun, 20 Dec 2020 18:18:26 +0000 (UTC), Christophe Leroy wrote:
> Force inlining of get_tb() in order to avoid getting
> following function in vdso32, leading to suboptimal
> performance in clock_gettime()
> 
> 00000688 <.get_tb>:
>  688:	7c 6d 42 a6 	mftbu   r3
>  68c:	7c 8c 42 a6 	mftb    r4
>  690:	7d 2d 42 a6 	mftbu   r9
>  694:	7c 03 48 40 	cmplw   r3,r9
>  698:	40 e2 ff f0 	bne+    688 <.get_tb>
>  69c:	4e 80 00 20 	blr

Applied to powerpc/fixes.

[1/1] powerpc/time: Force inlining of get_tb()
      https://git.kernel.org/powerpc/c/0faa22f09caadc11af2aa7570870ebd2ac5b8170

cheers