linux-kernel - [PATCH 1/1] oprofile: add a warning for unsuppored CPUs

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Message-Id: <200611291954.57548.cap@nsc.liu.se>
Date:	Wed, 29 Nov 2006 19:54:55 +0100
From:	Peter Kjellstrom <cap@....liu.se>
To:	linux-kernel@...r.kernel.org
Cc:	trivial@...nel.org, levon@...ementarian.org
Subject: [PATCH 1/1] oprofile: add a warning for unsuppored CPUs

From: Peter Kjellstrom <cap@....liu.se>

Oprofile first tries to setup hardware counter based profiling. If this fails
it falls back to timer mode without any clues as to what went wrong. This
patch adds a warning when no supported CPU is found (typically too new CPU
and/or too old kernel).

Signed-off-by: Peter Kjellstrom <cap@....liu.se>

---

--- a/arch/i386/oprofile/init.c
+++ b/arch/i386/oprofile/init.c
@@ -29,6 +29,8 @@ int __init oprofile_arch_init(struct opr

 #ifdef CONFIG_X86_LOCAL_APIC
        ret = op_nmi_init(ops);
+       if (ret == -ENODEV)
+               printk(KERN_INFO "oprofile: hardware counters unavailable, unknown cpu.\n");
 #endif
 #ifdef CONFIG_X86_IO_APIC
        if (ret < 0)
-
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