Date: Tue, 28 Mar 2017 14:03:24 +1100 From: Andrew Donnellan <andrew.donnellan@....ibm.com> To: Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org Cc: Emese Revfy <re.emese@...il.com>, Arnd Bergmann <arnd@...db.de>, Josh Triplett <josh@...htriplett.org>, pageexec@...email.hu, yamada.masahiro@...ionext.com, minipli@...linux.so, linux@...linux.org.uk, catalin.marinas@....com, linux@...musvillemoes.dk, david.brown@...aro.org, benh@...nel.crashing.org, tglx@...utronix.de, akpm@...ux-foundation.org, jlayton@...chiereds.net, sam@...nborg.org, kernel-hardening@...ts.openwall.com, linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>, Michael Ellerman <mpe@...erman.id.au> Subject: Re: [PATCH v5 1/4] gcc-plugins: Add the initify gcc plugin On 27/03/17 18:38, Andrew Donnellan wrote: > On 01/02/17 07:24, Kees Cook wrote: >> From: Emese Revfy <re.emese@...il.com> >> >> The kernel already has a mechanism to free up code and data memory that >> is only used during kernel or module initialization. This plugin will >> teach the compiler to find more such code and data that can be freed >> after initialization. > > Currently checking whether we can wire this up for powerpc without too > many problems... Added "select HAVE_GCC_PLUGIN_INITIFY_INIT_EXIT if GCC_PLUGINS" to arch/powerpc/Kconfig and have successfully compiled and booted a modular and non-modular powernv_defconfig, it looks like we handle the .exit sections correctly. Could this be folded in for further testing when you get around to v6, Kees? -- Andrew Donnellan OzLabs, ADL Canberra andrew.donnellan@....ibm.com IBM Australia Limited
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