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Starting with LLVM r308050, clang generates a jump table with EL1 virtual addresses in __init_stage2_translation, which results in a kernel panic when booting at EL2: Kernel panic - not syncing: HYP panic: PS:800003c9 PC:ffff0000089e6fd8 ESR:86000004 FAR:ffff0000089e6fd8 HPFAR:0000000009825000 PAR:0000000000000000 VCPU:000804fc20001221 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.14.0-rc7-dirty #3 Hardware name: ARM Juno development board (r1) (DT) Call trace: [<ffff000008088ea4>] dump_backtrace+0x0/0x34c [<ffff000008089208>] show_stack+0x18/0x20 [<ffff0000089c73ec>] dump_stack+0xc4/0xfc [<ffff0000080c8e1c>] panic+0x138/0x2b4 [<ffff0000080c8ce4>] panic+0x0/0x2b4 SMP: stopping secondary CPUs SMP: failed to stop secondary CPUs 0-3,5 Kernel Offset: disabled CPU features: 0x002086 Memory Limit: none ---[ end Kernel panic - not syncing: HYP panic: PS:800003c9 PC:ffff0000089e6fd8 ESR:86000004 FAR:ffff0000089e6fd8 HPFAR:0000000009825000 PAR:0000000000000000 VCPU:000804fc20001221 This change adds -fno-jump-tables to arm64/hyp to work around the bug. Bug: 62093296 Bug: 67506682 Bug: 133186739 Change-Id: I1257be1febdcbfcc886fe6183c698b7a98d2a153 (am from https://patchwork.kernel.org/patch/10060301/) Suggested-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.