linux-kernel - Is topology_core_siblings for use by drivers?

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20080729071422.GD28989@parisc-linux.org>
Date:	Tue, 29 Jul 2008 01:14:22 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	linux-ia64@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org
Subject: Is topology_core_siblings for use by drivers?


allmodconfig currently dies with:

ERROR: "cpu_core_map" [drivers/net/sfc/sfc.ko] undefined!

$ grep -r cpu_core_map include/asm-ia64/
include/asm-ia64/smp.h:extern cpumask_t cpu_core_map[NR_CPUS];
include/asm-ia64/topology.h:#define topology_core_siblings(cpu) (cpu_core_map[cpu])

OK ... it's not exported to modules.  Do other architectures have this
problem?

$ grep topology_core_siblings include/asm-*/topology.h
include/asm-ia64/topology.h:#define topology_core_siblings(cpu) (cpu_core_map[cpu])
include/asm-powerpc/topology.h:#define topology_core_siblings(cpu) (per_cpu(cpu_core_map, cpu))
include/asm-s390/topology.h:#define topology_core_siblings(cpu) (cpu_core_map[cpu])
include/asm-x86/topology.h:#define topology_core_siblings(cpu) (per_cpu(cpu_core_map, cpu))

s390, I guess.  But they don't have PCI device drivers.

If device drivers are supposed to call this, please apply this patch:

----

Export cpu_core_map so modules can call topology_core_siblings()

Signed-off-by: Matthew Wilcox <willy@...ux.intel.com>

diff --git a/arch/ia64/kernel/smpboot.c b/arch/ia64/kernel/smpboot.c
index 03f1a99..6cb0927 100644
--- a/arch/ia64/kernel/smpboot.c
+++ b/arch/ia64/kernel/smpboot.c
@@ -138,6 +138,7 @@ cpumask_t cpu_possible_map = CPU_MASK_NONE;
 EXPORT_SYMBOL(cpu_possible_map);
 
 cpumask_t cpu_core_map[NR_CPUS] __cacheline_aligned;
+EXPORT_SYMBOL(cpu_core_map);
 DEFINE_PER_CPU_SHARED_ALIGNED(cpumask_t, cpu_sibling_map);
 EXPORT_PER_CPU_SYMBOL(cpu_sibling_map);
 

-- 
Intel are signing my paycheques ... these opinions are still mine
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/