Toshi Kani 9a58eebe1a x86/mm: Remove region_is_ram() call from ioremap ... __ioremap_caller() calls region_is_ram() to walk through the iomem_resource table to check if a target range is in RAM, which was added to improve the lookup performance over page_is_ram() (commit 906e36c5c7 "x86: use optimized ioresource lookup in ioremap function"). page_is_ram() was no longer used when this change was added, though. __ioremap_caller() then calls walk_system_ram_range(), which had replaced page_is_ram() to improve the lookup performance (commit c81c8a1eee "x86, ioremap: Speed up check for RAM pages"). Since both checks walk through the same iomem_resource table for the same purpose, there is no need to call both functions. Aside of that walk_system_ram_range() is the only useful check at the moment because region_is_ram() always returns -1 due to an implementation bug. That bug in region_is_ram() cannot be fixed without breaking existing ioremap callers, which rely on the subtle difference of walk_system_ram_range() versus non page aligned ranges. Once these offending callers are fixed we can use region_is_ram() and remove walk_system_ram_range(). [ tglx: Massaged changelog ] Signed-off-by: Toshi Kani <toshi.kani@hp.com> Reviewed-by: Dan Williams <dan.j.williams@intel.com> Cc: Roland Dreier <roland@purestorage.com> Cc: Mike Travis <travis@sgi.com> Cc: Luis R. Rodriguez <mcgrof@suse.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/1437088996-28511-3-git-send-email-toshi.kani@hp.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>		2015-07-22 17:20:34 +02:00
..
boot	The libnvdimm sub-system introduces, in addition to the libnvdimm-core,	2015-06-29 10:34:42 -07:00
configs
crypto	crypto: aesni - fix failing setkey for rfc4106-gcm-aesni	2015-06-29 16:06:30 +08:00
entry	x86/entry/64, x86/nmi/64: Add CONFIG_DEBUG_ENTRY NMI testing code	2015-07-17 12:50:14 +02:00
ia32
include	Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-07-18 10:49:57 -07:00
kernel	x86/fpu: Disable dependent CPU features on "noxsave"	2015-07-21 08:20:42 +02:00
kvm	kvm: x86: fix load xsave feature warning	2015-07-10 13:26:45 +02:00
lguest
lib	perf/x86: Fix copy_from_user_nmi() return if range is not ok	2015-07-06 14:09:27 +02:00
math-emu
mm	x86/mm: Remove region_is_ram() call from ioremap	2015-07-22 17:20:34 +02:00
net	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2015-06-24 16:49:49 -07:00
oprofile
pci	PCI changes for the v4.2 merge window:	2015-06-23 13:41:24 -07:00
platform	Replace module_init with equivalent device_initcall in non modules.	2015-07-02 10:30:48 -07:00
power
purgatory
realmode
tools
um	Merge branch 'for-linus-4.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml	2015-06-28 13:55:08 -07:00
video
xen
.gitignore
Kbuild
Kconfig	x86/fpu, sched: Introduce CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT and use it on x86	2015-07-18 03:42:51 +02:00
Kconfig.cpu
Kconfig.debug	x86/entry/64, x86/nmi/64: Add CONFIG_DEBUG_ENTRY NMI testing code	2015-07-17 12:50:14 +02:00
Makefile
Makefile.um
Makefile_32.cpu