linux-kernel - [PATCH 2/2] powerpc/powernv: Skip registering log region when CONFIG

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Message-Id: <1421797911-23650-2-git-send-email-bobby.prani@gmail.com>
Date:	Tue, 20 Jan 2015 18:51:50 -0500
From:	Pranith Kumar <bobby.prani@...il.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>,
	Anton Blanchard <anton@...ba.org>,
	Neelesh Gupta <neelegup@...ux.vnet.ibm.com>,
	Joel Stanley <joel@....id.au>,
	Vasant Hegde <hegdevasant@...ux.vnet.ibm.com>,
	Rob Herring <robh@...nel.org>,
	linuxppc-dev@...ts.ozlabs.org (open list:LINUX FOR POWERPC...),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 2/2] powerpc/powernv: Skip registering log region when CONFIG_PRINTK=n

When CONFIG_PRINTK=n, log_buf_addr_get() returns NULL and log_buf_len_get()
return 0. Check for these return values and skip registering the dump buffer.

Signed-off-by: Pranith Kumar <bobby.prani@...il.com>
CC: Michael Ellerman <mpe@...erman.id.au>
---
 arch/powerpc/platforms/powernv/opal.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
index f10b9ec..1db119f0 100644
--- a/arch/powerpc/platforms/powernv/opal.c
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -667,7 +667,13 @@ static void __init opal_dump_region_init(void)
 
 	/* Register kernel log buffer */
 	addr = log_buf_addr_get();
+	if (addr == NULL)
+		return;
+
 	size = log_buf_len_get();
+	if (size == 0)
+		return;
+
 	rc = opal_register_dump_region(OPAL_DUMP_REGION_LOG_BUF,
 				       __pa(addr), size);
 	/* Don't warn if this is just an older OPAL that doesn't
-- 
1.9.1

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