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authorMike Travis <mike.travis@hpe.com>2017-03-22 00:16:47 +0100
committerIngo Molnar <mingo@kernel.org>2017-03-22 07:41:10 +0100
commitad4830051aac0b967add82ac168f49edf11f01a0 (patch)
tree35b78ccae0885291e3fbb163c9aaf49b21232a68 /arch/x86/kernel/apic
parentLinux 4.11-rc3 (diff)
downloadlinux-ad4830051aac0b967add82ac168f49edf11f01a0.tar.xz
linux-ad4830051aac0b967add82ac168f49edf11f01a0.zip
x86/platform/uv: Fix calculation of Global Physical Address
The calculation of the global physical address (GPA) on UV4 is incorrect. The gnode_extra/upper global offset should only be applied for fixed address space systems (UV1..3). Tested-by: John Estabrook <john.estabrook@hpe.com> Signed-off-by: Mike Travis <mike.travis@hpe.com> Cc: Dimitri Sivanich <dimitri.sivanich@hpe.com> Cc: John Estabrook <estabrook@sgi.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Russ Anderson <russ.anderson@hpe.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20170321231646.667689538@asylum.americas.sgi.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/apic')
-rw-r--r--arch/x86/kernel/apic/x2apic_uv_x.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index e9f8f8cdd570..86f20cc0a65e 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -1105,7 +1105,8 @@ void __init uv_init_hub_info(struct uv_hub_info_s *hi)
node_id.v = uv_read_local_mmr(UVH_NODE_ID);
uv_cpuid.gnode_shift = max_t(unsigned int, uv_cpuid.gnode_shift, mn.n_val);
hi->gnode_extra = (node_id.s.node_id & ~((1 << uv_cpuid.gnode_shift) - 1)) >> 1;
- hi->gnode_upper = (unsigned long)hi->gnode_extra << mn.m_val;
+ if (mn.m_val)
+ hi->gnode_upper = (u64)hi->gnode_extra << mn.m_val;
if (uv_gp_table) {
hi->global_mmr_base = uv_gp_table->mmr_base;