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authorVincenzo Frascino <vincenzo.frascino@arm.com>2019-08-23 17:37:17 +0100
committerWill Deacon <will@kernel.org>2019-08-27 18:16:20 +0100
commit92af2b696119e491a95d77acdd8832b582d300d4 (patch)
treefccf2394ba5784c978d80758bef60bab04f8ca5f /scripts
parent1243cb6a676ffcfa72dd25859edddf66cde0b638 (diff)
downloadlinux-92af2b696119e491a95d77acdd8832b582d300d4.tar.bz2
arm64: Relax Documentation/arm64/tagged-pointers.rst
On AArch64 the TCR_EL1.TBI0 bit is set by default, allowing userspace (EL0) to perform memory accesses through 64-bit pointers with a non-zero top byte. However, such pointers were not allowed at the user-kernel syscall ABI boundary. With the Tagged Address ABI patchset, it is now possible to pass tagged pointers to the syscalls. Relax the requirements described in tagged-pointers.rst to be compliant with the behaviours guaranteed by the AArch64 Tagged Address ABI. Cc: Will Deacon <will.deacon@arm.com> Cc: Szabolcs Nagy <szabolcs.nagy@arm.com> Cc: Kevin Brodsky <kevin.brodsky@arm.com> Acked-by: Andrey Konovalov <andreyknvl@google.com> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Co-developed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will@kernel.org>
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