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x86/topology: Fix logical package mapping

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That first branch testing pkg against __max_logical_packages is wrong,
because if the first pkg id is larger, then the find_first_zero will
find us logical package id 0. However, if the second pkg id is indeed
0, we'll again claim it without testing if it was already taken.

Also, it fails to print the mapping.

Fixes: 1f12e32f4cd5 ("x86/topology: Create logical package id")
Reported-by: Xiong Zhou <jencce.kernel@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: aherrmann@suse.com
Cc: bp@alien8.de
Cc: Mike Galbraith <umgwanakikbuti@gmail.com>
Link: http://lkml.kernel.org/r/20160317095220.GO6344@twins.programming.kicks-ass.net
Link: http://lkml.kernel.org/r/20160318150538.482393396@infradead.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Peter Zijlstra
2016-03-18 16:03:46 +01:00
committed by Thomas Gleixner
parent 551adc6057
commit b5d5f27d93
1 changed files with 0 additions and 5 deletions
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5
arch/x86/kernel/smpboot.c
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@ -274,11 +274,6 @@ int topology_update_package_map(unsigned int apicid, unsigned int cpu)
if (test_and_set_bit(pkg, physical_package_map))
goto found;
if (pkg < __max_logical_packages) {
set_bit(pkg, logical_package_map);
physical_to_logical_pkg[pkg] = pkg;
goto found;
}
new = find_first_zero_bit(logical_package_map, __max_logical_packages);
if (new >= __max_logical_packages) {
physical_to_logical_pkg[pkg] = -1;