Yup. But I just remembered a better solution:

From: Wolfram Sang <redacted> Subject: [PATCH] ppc:
mpc52xx: silence false positive from old GCC

So people can compile with -Werror.

Signed-off-by: Wolfram Sang <redacted> --- 
arch/powerpc/platforms/52xx/mpc52xx_pic.c |    2 +- 1 file changed,
1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/52xx/mpc52xx_pic.c

b/arch/powerpc/platforms/52xx/mpc52xx_pic.c index b89ef65..2898b73
100644 --- a/arch/powerpc/platforms/52xx/mpc52xx_pic.c +++
b/arch/powerpc/platforms/52xx/mpc52xx_pic.c @@ -340,7 +340,7 @@
static int mpc52xx_irqhost_map(struct irq_domain *h, unsigned int
virq, { int l1irq; int l2irq; -	struct irq_chip *irqchip; +	struct
irq_chip *uninitialized_var(irqchip); void *hndlr; int type; u32
reg;


uninitialized_var was created for exactly that purpose IIRC.