linux-kernel - Re: [PATCH v2 16/17] selftests: vdso: Make VDSO function call more generic

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Message-ID: <Zsww1IgALClDUf8g@zx2c4.com>
Date: Mon, 26 Aug 2024 09:37:56 +0200
From: "Jason A. Donenfeld" <Jason@...c4.com>
To: Christophe Leroy <christophe.leroy@...roup.eu>
Cc: Michael Ellerman <mpe@...erman.id.au>,
	Nicholas Piggin <npiggin@...il.com>,
	Naveen N Rao <naveen@...nel.org>, Andy Lutomirski <luto@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>, Theodore Ts'o <tytso@....edu>,
	Arnd Bergmann <arnd@...db.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Vincenzo Frascino <vincenzo.frascino@....com>,
	Shuah Khan <shuah@...nel.org>, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-arch@...r.kernel.org, linux-mm@...ck.org,
	linux-trace-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v2 16/17] selftests: vdso: Make VDSO function call more
 generic

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?