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authorMark Salter <msalter@redhat.com>2014-04-08 02:39:48 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2014-04-08 03:36:15 +0400
commit9e5c33d7aeeef62e5fa7e74f94432685bd03026b (patch)
treeff62a742103d422f2c74c192af434a0023324c0e /mm/Kconfig
parent6b550f6f2004017f1b4633d2c9e39b610bfe84f0 (diff)
downloadlinux-9e5c33d7aeeef62e5fa7e74f94432685bd03026b.tar.xz
mm: create generic early_ioremap() support
This patch creates a generic implementation of early_ioremap() support based on the existing x86 implementation. early_ioremp() is useful for early boot code which needs to temporarily map I/O or memory regions before normal mapping functions such as ioremap() are available. Some architectures have optional MMU. In the no-MMU case, the remap functions simply return the passed in physical address and the unmap functions do nothing. Signed-off-by: Mark Salter <msalter@redhat.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: H. Peter Anvin <hpa@zytor.com> Cc: Borislav Petkov <borislav.petkov@amd.com> Cc: Dave Young <dyoung@redhat.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/Kconfig')
-rw-r--r--mm/Kconfig3
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/Kconfig b/mm/Kconfig
index 37fbe1ef5239..ebe5880c29d6 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -578,3 +578,6 @@ config PGTABLE_MAPPING
You can check speed with zsmalloc benchmark:
https://github.com/spartacus06/zsmapbench
+
+config GENERIC_EARLY_IOREMAP
+ bool