From: Segher Boessenkool <segher@kernel.crashing.org>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: linuxppc-dev@lists.ozlabs.org, stable@vger.kernel.org,
Anders Roxell <anders.roxell@linaro.org>,
linux-kernel@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>
Subject: Re: [PATCH 2/3] powerpc: fix build errors
Date: Thu, 24 Feb 2022 11:37:13 -0600 [thread overview]
Message-ID: <20220224173713.GO614@gate.crashing.org> (raw)
In-Reply-To: <871qzsphfv.fsf@mpe.ellerman.id.au>
On Thu, Feb 24, 2022 at 11:39:16PM +1100, Michael Ellerman wrote:
> > /* Calculate the parity of the value */
> > - asm ("popcntd %0,%1" : "=r" (parity) : "r" (val));
> > + asm (".machine \"push\"\n"
> > + ".machine \"power7\"\n"
> > + "popcntd %0,%1\n"
> > + ".machine \"pop\"\n"
> > + : "=r" (parity) : "r" (val));
>
> This was actually present in an older CPU, but it doesn't really matter,
> this is fine.
popcntd was new on p7 (popcntb is the older one :-) ) And it does not
matter indeed.
Segher
WARNING: multiple messages have this Message-ID (diff)
From: Segher Boessenkool <segher@kernel.crashing.org>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: Anders Roxell <anders.roxell@linaro.org>,
Arnd Bergmann <arnd@arndb.de>,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
stable@vger.kernel.org
Subject: Re: [PATCH 2/3] powerpc: fix build errors
Date: Thu, 24 Feb 2022 11:37:13 -0600 [thread overview]
Message-ID: <20220224173713.GO614@gate.crashing.org> (raw)
In-Reply-To: <871qzsphfv.fsf@mpe.ellerman.id.au>
On Thu, Feb 24, 2022 at 11:39:16PM +1100, Michael Ellerman wrote:
> > /* Calculate the parity of the value */
> > - asm ("popcntd %0,%1" : "=r" (parity) : "r" (val));
> > + asm (".machine \"push\"\n"
> > + ".machine \"power7\"\n"
> > + "popcntd %0,%1\n"
> > + ".machine \"pop\"\n"
> > + : "=r" (parity) : "r" (val));
>
> This was actually present in an older CPU, but it doesn't really matter,
> this is fine.
popcntd was new on p7 (popcntb is the older one :-) ) And it does not
matter indeed.
Segher
next prev parent reply other threads:[~2022-02-24 17:40 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-23 13:58 [PATCH 1/3] powerpc: lib: sstep: fix 'sthcx' instruction Anders Roxell
2022-02-23 13:58 ` Anders Roxell
2022-02-23 13:58 ` [PATCH 2/3] powerpc: fix build errors Anders Roxell
2022-02-23 13:58 ` Anders Roxell
2022-02-23 15:21 ` Segher Boessenkool
2022-02-23 15:21 ` Segher Boessenkool
2022-02-24 2:54 ` Nicholas Piggin
2022-02-24 2:54 ` Nicholas Piggin
2022-02-24 5:05 ` Nicholas Piggin
2022-02-24 5:05 ` Nicholas Piggin
2022-02-24 8:55 ` Arnd Bergmann
2022-02-24 8:55 ` Arnd Bergmann
2022-02-24 10:11 ` Nicholas Piggin
2022-02-24 10:11 ` Nicholas Piggin
2022-02-24 10:20 ` Arnd Bergmann
2022-02-24 10:20 ` Arnd Bergmann
2022-02-24 11:13 ` Nicholas Piggin
2022-02-24 11:13 ` Nicholas Piggin
2022-02-24 17:29 ` Segher Boessenkool
2022-02-24 17:29 ` Segher Boessenkool
2022-02-25 0:23 ` Nicholas Piggin
2022-02-25 0:23 ` Nicholas Piggin
2022-02-25 22:28 ` Segher Boessenkool
2022-02-25 22:28 ` Segher Boessenkool
2022-02-26 0:07 ` Nicholas Piggin
2022-02-26 0:07 ` Nicholas Piggin
2022-02-24 17:12 ` Segher Boessenkool
2022-02-24 17:12 ` Segher Boessenkool
2022-02-25 0:32 ` Nicholas Piggin
2022-02-25 0:32 ` Nicholas Piggin
2022-02-25 8:33 ` Arnd Bergmann
2022-02-25 8:33 ` Arnd Bergmann
2022-02-25 10:51 ` Nicholas Piggin
2022-02-25 10:51 ` Nicholas Piggin
2022-02-25 22:33 ` Segher Boessenkool
2022-02-25 22:33 ` Segher Boessenkool
2022-02-24 12:39 ` Michael Ellerman
2022-02-24 12:39 ` Michael Ellerman
2022-02-24 16:12 ` Anders Roxell
2022-02-24 16:12 ` Anders Roxell
2022-02-24 17:37 ` Segher Boessenkool [this message]
2022-02-24 17:37 ` Segher Boessenkool
2022-02-23 13:58 ` [PATCH 3/3] powerpc: lib: sstep: " Anders Roxell
2022-02-23 13:58 ` Anders Roxell
2022-02-23 15:27 ` Segher Boessenkool
2022-02-23 15:27 ` Segher Boessenkool
2022-02-24 2:40 ` [PATCH 1/3] powerpc: lib: sstep: fix 'sthcx' instruction Nicholas Piggin
2022-02-24 2:40 ` Nicholas Piggin
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