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swh:1:snp:0424f14fb59df2ee63d8659da5115ce9de06a349
Revision 5edf71ae129167ac276ebac18b25ccc7bec6ac3e authored by Russell King on 25 November 2005, 15:52:51 UTC, committed by Russell King on 25 November 2005, 15:52:51 UTC 
[ARM] Do not call flush_tlb_kernel_range() with IRQs disabled.
 
We must not call TLB maintainence operations with interrupts disabled,
otherwise we risk a lockup in the SMP IPI code.

This means that consistent_free() can not be called from a context with
IRQs disabled.  In addition, we must not hold the lock in consistent_free
when we call flush_tlb_kernel_range().  However, we must continue to
prevent consistent_alloc() from re-using the memory region until we've
finished tearing down the mapping and dealing with the TLB.

Therefore, leave the vm_region entry in the list, but mark it inactive
before dropping the lock and starting the tear-down process.  After the
mapping has been torn down, re-acquire the lock and remove the entry
from the list.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
1 parent 3c0bdac
History
Tip revision: e8b0ccb2a787fb43f8091a1eaef9c28a79b00002 authored by Linus Torvalds on 05 April 2024, 17:05:42 UTC
Merge tag '9p-for-6.9-rc3' of https://github.com/martinetd/linux
Tip revision: e8b0ccb
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