From 1af3c2e45e7a641e774bbb84fa428f2f0bf2d9c9 Mon Sep 17 00:00:00 2001 From: Bjorn Helgaas Date: Tue, 26 Oct 2010 15:41:54 -0600 Subject: [PATCH] x86: allocate space within a region top-down Request that allocate_resource() use available space from high addresses first, rather than the default of using low addresses first. The most common place this makes a difference is when we move or assign new PCI device resources. Low addresses are generally scarce, so it's better to use high addresses when possible. This follows Windows practice for PCI allocation. Reference: https://bugzilla.kernel.org/show_bug.cgi?id=16228#c42 Signed-off-by: Bjorn Helgaas Signed-off-by: Jesse Barnes --- arch/x86/kernel/setup.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index 922b5a1f978..0fe76df866d 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -788,6 +788,7 @@ void __init setup_arch(char **cmdline_p) x86_init.oem.arch_setup(); + resource_alloc_from_bottom = 0; iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1; setup_memory_map(); parse_setup_data(); -- 2.39.3