On Mon, Feb 14, 2011 at 03:30:06PM +0100, Ingo Molnar wrote:
>
> * tip-bot for Andreas Herrmann <andreas.herrmann3@xxxxxxx> wrote:
>
> > Commit-ID: d518573de63fb119e5e9a3137386544671387681
> > Gitweb: http://git.kernel.org/tip/d518573de63fb119e5e9a3137386544671387681
> > Author: Andreas Herrmann <andreas.herrmann3@xxxxxxx>
> > AuthorDate: Mon, 24 Jan 2011 16:05:40 +0100
>
> Andreas,
>
> the build is now producing this warning:
>
> arch/x86/kernel/cpu/amd.c: In function 'amd_detect_cmp':
> arch/x86/kernel/cpu/amd.c:268: warning: 'cores_per_cu' may be used uninitialized in this function
> arch/x86/kernel/cpu/amd.c:268: note: 'cores_per_cu' was declared here
Here's a quick fix against tip/amd-nb:
--
From: Borislav Petkov <borislav.petkov@xxxxxxx>
Date: Mon, 14 Feb 2011 16:25:47 +0100
Subject: [PATCH] x86, amd: Fix uninitialized variable warning
d518573de63fb119e5e9a3137386544671387681 introduced compute unit
normalization but causes a valid compiler warning:
arch/x86/kernel/cpu/amd.c: In function 'amd_detect_cmp':
arch/x86/kernel/cpu/amd.c:268: warning: 'cores_per_cu' may be used uninitialized in this function
arch/x86/kernel/cpu/amd.c:268: note: 'cores_per_cu' was declared here
Initialize it with a proper value. Also, fixup comment while at it.
Cc: Andreas Herrmann <andreas.herrmann3@xxxxxxx>
Signed-off-by: Borislav Petkov <borislav.petkov@xxxxxxx>
---
arch/x86/kernel/cpu/amd.c | 6 +++---
1 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 990cc48..589bdd7 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -261,7 +261,7 @@ static int __cpuinit nearby_node(int apicid)
#ifdef CONFIG_X86_HT
static void __cpuinit amd_get_topology(struct cpuinfo_x86 *c)
{
- u32 nodes, cores_per_cu;
+ u32 nodes, cores_per_cu = 1;
u8 node_id;
int cpu = smp_processor_id();
@@ -276,7 +276,7 @@ static void __cpuinit amd_get_topology(struct cpuinfo_x86 *c)
/* get compute unit information */
smp_num_siblings = ((ebx >> 8) & 3) + 1;
c->compute_unit_id = ebx & 0xff;
- cores_per_cu = ((ebx >> 8) & 3) + 1;
+ cores_per_cu += ((ebx >> 8) & 3);
} else if (cpu_has(c, X86_FEATURE_NODEID_MSR)) {
u64 value;
@@ -298,7 +298,7 @@ static void __cpuinit amd_get_topology(struct cpuinfo_x86 *c)
/* store NodeID, use llc_shared_map to store sibling info */
per_cpu(cpu_llc_id, cpu) = node_id;
- /* core id to be in range from 0 to (cores_per_node - 1) */
+ /* core id has to be in the [0 .. cores_per_node - 1] range */
c->cpu_core_id %= cores_per_node;
c->compute_unit_id %= cus_per_node;
}
--
1.7.4.rc2
--
Regards/Gruss,
Boris.
Advanced Micro Devices GmbH
Einsteinring 24, 85609 Dornach
General Managers: Alberto Bozzo, Andrew Bowd
Registration: Dornach, Gemeinde Aschheim, Landkreis Muenchen
Registergericht Muenchen, HRB Nr. 43632
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