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Date: Mon, 26 Aug 2024 09:37:56 +0200
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
To: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Michael Ellerman <mpe@ellerman.id.au>,
	Nicholas Piggin <npiggin@gmail.com>,
	Naveen N Rao <naveen@kernel.org>, Andy Lutomirski <luto@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>, x86@kernel.org,
	"H. Peter Anvin" <hpa@zytor.com>, Theodore Ts'o <tytso@mit.edu>,
	Arnd Bergmann <arnd@arndb.de>,
	Andrew Morton <akpm@linux-foundation.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	Vincenzo Frascino <vincenzo.frascino@arm.com>,
	Shuah Khan <shuah@kernel.org>, linuxppc-dev@lists.ozlabs.org,
	linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-arch@vger.kernel.org, linux-mm@kvack.org,
	linux-trace-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org
Subject: Re: [PATCH v2 16/17] selftests: vdso: Make VDSO function call more
 generic
Message-ID: <Zsww1IgALClDUf8g@zx2c4.com>
References: <cover.1724309198.git.christophe.leroy@csgroup.eu>
 <bd05c8faee64972a9e01f9497d1870dc267a55f4.1724309198.git.christophe.leroy@csgroup.eu>
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In-Reply-To: <bd05c8faee64972a9e01f9497d1870dc267a55f4.1724309198.git.christophe.leroy@csgroup.eu>

On Thu, Aug 22, 2024 at 09:13:24AM +0200, Christophe Leroy wrote:
> On powerpc, a call to a VDSO function is not a standard C function
> call. Unlike x86 that returns a negated error code in case of an
> error, powerpc sets CR[SO] and returns the error code as a
> positive value.
> 
> So use a macro called VDSO_CALL() which takes a pointer to the
> function to call, the number of arguments and the arguments.
 
You'll probably want to move to VDSO_CALL() for the whole test suite,
not just the getrandom one, right?