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

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Date:   Tue, 15 Jan 2019 16:43:20 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        "Jonathan Neuschafer" <j.neuschaefer@....net>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        stable@...r.kernel.org
Subject: [RESENDING PATCH] powerpc/wii: properly disable use of BATs when requested.

'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
Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 Resending due to some servers not accepting 'umlaut' on Jonathan's family name. Sorry Jonathan.

<linux-kernel@...r.kernel.org>: host vger.kernel.org[209.132.180.67] said: 550
    5.7.1 Content-Policy reject msg: Message headers can not have 8-bit
    non-ASCII characters in it; Use MIME encodings if such are needed!  BF:<H
    1.16368e-10>; S1729557AbfAOQgb (in reply to end of DATA command)

<stable@...r.kernel.org>: host vger.kernel.org[209.132.180.67] said: 550 5.7.1
    Content-Policy reject msg: Message headers can not have 8-bit non-ASCII
    characters in it; Use MIME encodings if such are needed!  BF:<H
    1.16368e-10>; S1729557AbfAOQgb (in reply to end of DATA command)

 arch/powerpc/platforms/embedded6xx/wii.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/powerpc/platforms/embedded6xx/wii.c b/arch/powerpc/platforms/embedded6xx/wii.c
index ecf703ee3a76..bae843e32ae7 100644
--- a/arch/powerpc/platforms/embedded6xx/wii.c
+++ b/arch/powerpc/platforms/embedded6xx/wii.c
@@ -82,6 +82,9 @@ unsigned long __init wii_mmu_mapin_mem2(unsigned long top)
 
 	/* MEM2 64MB@...0000000 */
 	delta = wii_hole_start + wii_hole_size;
+	if (__map_without_bats)
+		return delta;
+
 	size = top - delta;
 	for (bl = 128<<10; bl < max_size; bl <<= 1) {
 		if (bl * 2 > size)
-- 
2.13.3