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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 <bjorn.helgaas@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Bjorn Helgaas 14 лет назад
Родитель
Сommit
1af3c2e45e
1 измененных файлов с 1 добавлено и 0 удалено
  1. 1 0
      arch/x86/kernel/setup.c

+ 1 - 0
arch/x86/kernel/setup.c

@@ -788,6 +788,7 @@ void __init setup_arch(char **cmdline_p)
 
 
 	x86_init.oem.arch_setup();
 	x86_init.oem.arch_setup();
 
 
+	resource_alloc_from_bottom = 0;
 	iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
 	iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
 	setup_memory_map();
 	setup_memory_map();
 	parse_setup_data();
 	parse_setup_data();