| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.13 127/160] arm64: Ensure the instruction emulation is ready for userspace | Date | Tue, 10 Oct 2017 21:50:55 +0200 |
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4.13-stable review patch. If anyone has any objections, please let me know.
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From: Suzuki K Poulose <suzuki.poulose@arm.com>
commit c0d8832e78cbfd4a64b7112e34920af4b0b0e60e upstream.
We trap and emulate some instructions (e.g, mrs, deprecated instructions) for the userspace. However the handlers for these are registered as late_initcalls and the userspace could be up and running from the initramfs by that time (with populate_rootfs, which is a rootfs_initcall()). This could cause problems for the early applications ending up in failure like :
[ 11.152061] modprobe[93]: undefined instruction: pc=0000ffff8ca48ff4
This patch promotes the specific calls to core_initcalls, which are guaranteed to be completed before we hit userspace.
Cc: Dave Martin <dave.martin@arm.com> Cc: Matthias Brugger <mbrugger@suse.com> Cc: James Morse <james.morse@arm.com> Reported-by: Matwey V. Kornilov <matwey.kornilov@gmail.com> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- arch/arm64/kernel/armv8_deprecated.c | 2 +- arch/arm64/kernel/cpufeature.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
--- a/arch/arm64/kernel/armv8_deprecated.c +++ b/arch/arm64/kernel/armv8_deprecated.c @@ -649,4 +649,4 @@ static int __init armv8_deprecated_init( return 0; } -late_initcall(armv8_deprecated_init); +core_initcall(armv8_deprecated_init); --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -1294,4 +1294,4 @@ static int __init enable_mrs_emulation(v return 0; } -late_initcall(enable_mrs_emulation); +core_initcall(enable_mrs_emulation);
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