path: root/lib/semaphore-sleepers.c
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authorZwane Mwaikambo <>2005-09-03 15:56:51 -0700
committerLinus Torvalds <>2005-09-05 00:06:13 -0700
commit4ad8d38342430f8b52f7a8458dce90caf8c8ca64 (patch)
tree090c471fdb44d8fe88c52e95be0e8e43e31fcd5a /lib/semaphore-sleepers.c
parentd7271b14b2e9e5905aba0fbf5c4dc4f8980c0cb2 (diff)
[PATCH] i386 boottime for_each_cpu broken
for_each_cpu walks through all processors in cpu_possible_map, which is defined as cpu_callout_map on i386 and isn't initialised until all processors have been booted. This breaks things which do for_each_cpu iterations early during boot. So, define cpu_possible_map as a bitmap with NR_CPUS bits populated. This was triggered by a patch i'm working on which does alloc_percpu before bringing up secondary processors. From: Alexander Nyberg <> i386-boottime-for_each_cpu-broken.patch i386-boottime-for_each_cpu-broken-fix.patch The SMP version of __alloc_percpu checks the cpu_possible_map before allocating memory for a certain cpu. With the above patches the BSP cpuid is never set in cpu_possible_map which breaks CONFIG_SMP on uniprocessor machines (as soon as someone tries to dereference something allocated via __alloc_percpu, which in fact is never allocated since the cpu is not set in cpu_possible_map). Signed-off-by: Zwane Mwaikambo <> Signed-off-by: Alexander Nyberg <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'lib/semaphore-sleepers.c')
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