path: root/arch/arm64/include/uapi
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authorMark Rutland <>2016-02-26 14:31:32 +0000
committerCatalin Marinas <>2016-02-26 15:22:53 +0000
commit3eca86e75ec7a7d4b9a9c8091b11676f7bd2a39f (patch)
tree8e1b4380409a85a922ee0d3f622b5dd4d16bcfad /arch/arm64/include/uapi
parent104a0c02e8b1936c049e18a6d4e4ab040fb61213 (diff)
arm64: Remove fixmap include fragility
The asm-generic fixmap.h depends on each architecture's fixmap.h to pull in the definition of PAGE_KERNEL_RO, if this exists. In the absence of this, FIXMAP_PAGE_RO will not be defined. In mm/early_ioremap.c the definition of early_memremap_ro is predicated on FIXMAP_PAGE_RO being defined. Currently, the arm64 fixmap.h doesn't include pgtable.h for the definition of PAGE_KERNEL_RO, and as a knock-on effect early_memremap_ro is not always defined, leading to link-time failures when it is used. This has been observed with defconfig on next-20160226. Unfortunately, as pgtable.h includes fixmap.h, adding the include introduces a circular dependency, which is just as fragile. Instead, this patch factors out PAGE_KERNEL_RO and other prot definitions into a new pgtable-prot header which can be included by poth pgtable.h and fixmap.h, avoiding the circular dependency, and ensuring that early_memremap_ro is alwyas defined where it is used. Signed-off-by: Mark Rutland <> Reported-by: Ard Biesheuvel <> Acked-by: Ard Biesheuvel <> Cc: Will Deacon <> Signed-off-by: Catalin Marinas <>
Diffstat (limited to 'arch/arm64/include/uapi')
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