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| author | Mark Salter <msalter@redhat.com> | 2014-04-07 15:39:48 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-04-07 16:36:15 -0700 |
| commit | 9e5c33d7aeeef62e5fa7e74f94432685bd03026b (patch) | |
| tree | ff62a742103d422f2c74c192af434a0023324c0e /mm/Kconfig | |
| parent | 6b550f6f2004017f1b4633d2c9e39b610bfe84f0 (diff) | |
| download | lwn-9e5c33d7aeeef62e5fa7e74f94432685bd03026b.tar.gz lwn-9e5c33d7aeeef62e5fa7e74f94432685bd03026b.zip | |
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/Kconfig | 3 |
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 |