linux-kernel - [PATCH 4.0 147/220] powerpc/cell: Fix crash in iic_setup_cpu() after per

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Message-Id: <20150502185900.676956856@linuxfoundation.org>
Date:	Sat,  2 May 2015 21:01:02 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH 4.0 147/220] powerpc/cell: Fix crash in iic_setup_cpu() after per_cpu changes

4.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Michael Ellerman <mpe@...erman.id.au>

commit b0dd00addc5035f87ec9c5820dacc1ebc7fcb3e6 upstream.

The conversion from __get_cpu_var() to this_cpu_ptr() in iic_setup_cpu()
is wrong. It causes an oops at boot.

We need the per-cpu address of struct cpu_iic, not cpu_iic.regs->prio.

Sparse noticed this, because we pass a non-iomem pointer to out_be64(),
but we obviously don't check the sparse results often enough.

Fixes: 69111bac42f5 ("powerpc: Replace __get_cpu_var uses")
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/powerpc/platforms/cell/interrupt.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/powerpc/platforms/cell/interrupt.c
+++ b/arch/powerpc/platforms/cell/interrupt.c
@@ -163,7 +163,7 @@ static unsigned int iic_get_irq(void)
 
 void iic_setup_cpu(void)
 {
-	out_be64(this_cpu_ptr(&cpu_iic.regs->prio), 0xff);
+	out_be64(&this_cpu_ptr(&cpu_iic)->regs->prio, 0xff);
 }
 
 u8 iic_get_target_id(int cpu)


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