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x86, olpc: Add comment about implicit optimization barrier 

Signed-off-by: Andres Salomon <dilinger@queued.net>
Cc: H. Peter Anvin <hpa@linux.intel.com>
LKML-Reference: <20100618174653.7755a39a@dev.queued.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Andres Salomon 2010-06-23 20:27:00 -04:00 committed by Ingo Molnar
parent fd699c7655
commit 75a9cac430
1 changed files with 2 additions and 0 deletions
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arch/x86/kernel/olpc_ofw.c
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@ -35,6 +35,8 @@ void __init setup_olpc_ofw_pgd(void)
/* install OFW's PDE permanently into the kernel's pgtable */
set_pgd(&swapper_pg_dir[OLPC_OFW_PDE_NR], *ofw_pde);
/* implicit optimization barrier here due to uninline function return */
early_iounmap(base, sizeof(olpc_ofw_pgd) * PTRS_PER_PGD);
}