This series backports the Neoverse-N1 #1542419 erratum workaround to v4.19.116. The series was originally merged in v5.5.
These patches handle user-space. The kernel change was: commit dd8a1f134884 ("arm64: ftrace: Ensure synchronisation in PLT setup for Neoverse-N1 #1542419"), which has already been picked up by stable. (magic!)
Backporting this stuff past v4.19 isn't straight-forward as the kernel change depends on the work done in: https://lore.kernel.org/linux-arm-kernel/1529656278-878-1-git-send-email-wil... which was merged for v4.19.
Thanks,
James
Catalin Marinas (1): arm64: Silence clang warning on mismatched value/register sizes
James Morse (3): arm64: errata: Hide CTR_EL0.DIC on systems affected by Neoverse-N1 #1542419 arm64: Fake the IminLine size on systems affected by Neoverse-N1 #1542419 arm64: compat: Workaround Neoverse-N1 #1542419 for compat user-space
Marc Zyngier (1): arm64: Add part number for Neoverse N1
Documentation/arm64/silicon-errata.txt | 1 + arch/arm64/Kconfig | 16 ++++++++++++++++ arch/arm64/include/asm/cache.h | 3 ++- arch/arm64/include/asm/cpucaps.h | 3 ++- arch/arm64/include/asm/cputype.h | 2 ++ arch/arm64/kernel/cpu_errata.c | 22 ++++++++++++++++++++++ arch/arm64/kernel/sys_compat.c | 11 +++++++++++ arch/arm64/kernel/traps.c | 9 +++++++++ 8 files changed, 65 insertions(+), 2 deletions(-)