From: Bjorn Helgaas Date: Thu, 30 Mar 2006 16:53:39 +0000 (-0700) Subject: [IA64] ioremap() should prefer WB over UC X-Git-Tag: firefly_0821_release~36571^2 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c1c57d767100417f63c18da52d7e96f82b2b9e1a;p=firefly-linux-kernel-4.4.55.git [IA64] ioremap() should prefer WB over UC efi_memmap_init() collects full granules of WB memory, without regard for whether they also support UC. So in order for ioremap() to work for main memory, it must prefer WB mappings when possible. Signed-off-by: Bjorn Helgaas Signed-off-by: Tony Luck --- diff --git a/arch/ia64/mm/ioremap.c b/arch/ia64/mm/ioremap.c index 62328621f99c..643ccc6960ce 100644 --- a/arch/ia64/mm/ioremap.c +++ b/arch/ia64/mm/ioremap.c @@ -21,12 +21,12 @@ __ioremap (unsigned long offset, unsigned long size) void __iomem * ioremap (unsigned long offset, unsigned long size) { - if (efi_mem_attribute_range(offset, size, EFI_MEMORY_UC)) - return __ioremap(offset, size); - if (efi_mem_attribute_range(offset, size, EFI_MEMORY_WB)) return phys_to_virt(offset); + if (efi_mem_attribute_range(offset, size, EFI_MEMORY_UC)) + return __ioremap(offset, size); + /* * Someday this should check ACPI resources so we * can do the right thing for hot-plugged regions.