linux-kernel - [PATCH 4.4 210/230] powerpc/wii: properly disable use of BATs when requested.

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Date:   Fri, 22 Mar 2019 12:15:48 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Jonathan Neuschafer <j.neuschaefer@....net>,
        Christophe Leroy <christophe.leroy@....fr>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH 4.4 210/230] powerpc/wii: properly disable use of BATs when requested.

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

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

From: Christophe Leroy <christophe.leroy@....fr>

commit 6d183ca8baec983dc4208ca45ece3c36763df912 upstream.

'nobats' kernel parameter or some options like CONFIG_DEBUG_PAGEALLOC
deny the use of BATS for mapping memory.

This patch makes sure that the specific wii RAM mapping function
takes it into account as well.

Fixes: de32400dd26e ("wii: use both mem1 and mem2 as ram")
Cc: stable@...r.kernel.org
Reviewed-by: Jonathan Neuschafer <j.neuschaefer@....net>
Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/powerpc/platforms/embedded6xx/wii.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/arch/powerpc/platforms/embedded6xx/wii.c
+++ b/arch/powerpc/platforms/embedded6xx/wii.c
@@ -104,6 +104,10 @@ unsigned long __init wii_mmu_mapin_mem2(
 	/* MEM2 64MB@...0000000 */
 	delta = wii_hole_start + wii_hole_size;
 	size = top - delta;
+
+	if (__map_without_bats)
+		return delta;
+
 	for (bl = 128<<10; bl < max_size; bl <<= 1) {
 		if (bl * 2 > size)
 			break;