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| author |   Toshi Kani <toshi.kani@hp.com> | 2015-04-14 15:47:20 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2015-04-14 16:49:04 -0700 |
| commit | 0ddab1d2ed664c85c95488eef569786a84aedf37 (patch) | |
| tree | b7f2d24f5ba9e307052833500758e0d7bf10bf53 /include/linux/io.h | |
| parent | mm: change __get_vm_area_node() to use fls_long() (diff) | |
| download | linux-dev-0ddab1d2ed664c85c95488eef569786a84aedf37.tar.xz linux-dev-0ddab1d2ed664c85c95488eef569786a84aedf37.zip | |
lib/ioremap.c: add huge I/O map capability interfaces
Add ioremap_pud_enabled() and ioremap_pmd_enabled(), which return 1 when
I/O mappings with pud/pmd are enabled on the kernel.
ioremap_huge_init() calls arch_ioremap_pud_supported() and
arch_ioremap_pmd_supported() to initialize the capabilities at boot-time.
A new kernel option "nohugeiomap" is also added, so that user can disable
the huge I/O map capabilities when necessary.
Signed-off-by: Toshi Kani <toshi.kani@hp.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Robert Elliott <Elliott@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/io.h')
| -rw-r--r-- | include/linux/io.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/io.h b/include/linux/io.h index fa02e55e5a2e..4cc299c598e0 100644 --- a/include/linux/io.h +++ b/include/linux/io.h @@ -38,6 +38,14 @@ static inline int ioremap_page_range(unsigned long addr, unsigned long end, } #endif +#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP +void __init ioremap_huge_init(void); +int arch_ioremap_pud_supported(void); +int arch_ioremap_pmd_supported(void); +#else +static inline void ioremap_huge_init(void) { } +#endif + /* * Managed iomap interface */ |