linux-kernel - kexec broken with STACKLEAK enabled

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Message-ID: <20190922173241.GA44503@rani.riverdale.lan>
Date:   Sun, 22 Sep 2019 13:32:42 -0400
From:   Arvind Sankar <nivedita@...m.mit.edu>
To:     linux-kernel@...r.kernel.org
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>
Subject: kexec broken with STACKLEAK enabled

Hi, since commit b059f801a937 (x86/purgatory: Use CFLAGS_REMOVE rather
than reset KBUILD_CFLAGS) kexec is broken if GCC_PLUGIN_STACKLEAK is
enabled, as the purgatory contains undefined references to
stackleak_track_stack.

Attempting to load a kexec kernel results in an error:

	kexec: Undefined symbol: stackleak_track_stack
	kexec-bzImage64: Loading purgatory failed

Adding $(DISABLE_STACKLEAK_PLUGIN) to PURGATORY_CFLAGS in
arch/x86/purgatory/Makefile fixes this.

Not sure if that's the best fix or if other architectures also require a
similar one.

Thanks.