From: Jakub Kicinski <jakub.kicinski@netronome.com>
To: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Arnd Bergmann <arnd@arndb.de>,
Andrew Morton <akpm@linux-foundation.org>,
kbuild test robot <fengguang.wu@intel.com>,
linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] bitfield: Use __ffs64(x) to fix missing __ffsdi2()
Date: Mon, 9 Oct 2017 07:34:34 -0700 [thread overview]
Message-ID: <20171009073434.0110d4fb@cakuba.netronome.com> (raw)
In-Reply-To: <1507538449-22775-1-git-send-email-geert+renesas@glider.be>
On Mon, 9 Oct 2017 10:40:49 +0200, Geert Uytterhoeven wrote:
> On most architectures[*], gcc turns __builtin_ffsll() into a call to
> __ffsdi2(), which is not provided by any architecture, leading to
> failures like:
>
> rcar-gen3-cpg.c:(.text+0x289): undefined reference to `__ffsdi2'
>
> To fix this, use __ffs64() instead, which is available on all
> architectures.
>
> [*] Known exceptions are some 64-bit architectures like amd64, arm64,
> ia64, powerpc64, and tilegx.
>
> Reported-by: kbuild test robot <fengguang.wu@intel.com>
> Fixes: 3e9b3112ec74f192 ("add basic register-field manipulation macros")
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Thanks!
next prev parent reply other threads:[~2017-10-09 14:34 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-09 8:40 Geert Uytterhoeven
2017-10-09 14:34 ` Jakub Kicinski [this message]
2017-10-09 22:37 ` kbuild test robot
2017-10-09 22:53 ` Jakub Kicinski
2017-10-10 7:03 ` Geert Uytterhoeven
2017-10-10 15:06 ` Jakub Kicinski
2017-10-09 22:57 ` kbuild test robot
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