linux-kernel - [PATCH 2/5] resources: Print resource conflicts for failed requests

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Date:	Wed,  7 Nov 2012 21:55:53 -0500
From:	Peter Hurley <peter@...leysoftware.com>
To:	linux-kernel@...r.kernel.org
Cc:	Peter Hurley <peter@...leysoftware.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH 2/5] resources: Print resource conflicts for failed requests

When resource requests fail, the conflicting resource is not
always apparent. Emit diagnostic print when resource conflicts prevent
resource requests. For example,
  kernel: resource: Requested i5k_amb [mem 0xfe000000-0xfe01ffff flags 0x80000000] conflicts with PCI Bus 0000:00 [mem 0xf0000000-0xfe000000 flags 0x200]

Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Signed-off-by: Peter Hurley <peter@...leysoftware.com>
---
 kernel/resource.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/resource.c b/kernel/resource.c
index 461c2e0..268b5fa 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -924,6 +924,10 @@ struct resource * __request_region(struct resource *parent,
 			write_lock(&resource_lock);
 			continue;
 		}
+
+		pr_debug("Requested %s %pr conflicts with %s %pr\n",
+			 res->name, res, conflict->name, conflict);
+
 		/* Uhhuh, that didn't work out.. */
 		kfree(res);
 		res = NULL;
-- 
1.7.12.3

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