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Date: Thu, 06 Jun 2019 23:52:50 +0100
From: David Howells <dhowells@...hat.com>
To: Eugeniu Rosca <erosca@...adit-jv.com>
Cc: dhowells@...hat.com, viro@...iv.linux.org.uk, raven@...maw.net,
linux-fsdevel@...r.kernel.org, linux-api@...r.kernel.org,
linux-block@...r.kernel.org, keyrings@...r.kernel.org,
linux-security-module@...r.kernel.org,
linux-kernel@...r.kernel.org,
Eugeniu Rosca <roscaeugeniu@...il.com>
Subject: Re: [PATCH 10/10] Add sample notification program [ver #3]
Eugeniu Rosca <erosca@...adit-jv.com> wrote:
> How about arm64? Do you intend to enable cross-compilation?
There's no guarantee that a cross-compiler can actually build userspace apps,
though I haven't intended to encode anything against that in the Makefile.
> > + asm ("lfence" : : : "memory" );
> [..]
> > + asm("mfence" ::: "memory");
>
> FWIW, trying to cross-compile it returned:
>
> aarch64-linux-gnu-gcc -I../../usr/include -I../../include watch_test.c -o watch_test
> /tmp/ccDXYynm.s: Assembler messages:
> /tmp/ccDXYynm.s:471: Error: unknown mnemonic `lfence' -- `lfence'
> /tmp/ccDXYynm.s:568: Error: unknown mnemonic `mfence' -- `mfence'
Yeah. I need to use C-standard __atomic_* stuff.
David
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