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Groups > linux.kernel > #1484181
| From | Mark Rutland <mark.rutland@arm.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [RFC PATCH 0/8] arm64: move thread_info off of the task stack |
| Date | 2016-09-15 15:50 +0200 |
| Message-ID | <shFd7-7FN-5@gated-at.bofh.it> (permalink) |
| Organization | linux.* mail to news gateway |
Building atop of Andy's work on x86 and generic code, these patches move arm64's thread_info off of the stack and into task_struct. This protects thread_info from corruption in the face of stack overflow, and serves as a step towards fully robust stack overflow handling will be addressed by subsequent patches. In contrast to x86, we can't place some critical data such as preempt_count in percpu variables, and we must store these in some per-task location. This, compounded with the way headers are organised conspires to require us to still define our own thread_info. I understand that the longer term plan is to kill off thread_info entirely, hence I'm sending this as an RFC so we can figure out if/how we can achieve that. These patches are based on Andy's x86/vmap_stack branch [1,2], and I've pushed a copy to me arm64/ti-stack-split branch [3,4]. The result of these patches boots happily on platforms within reach of my desk, but has not seen much stressing so far. Thanks, Mark. [1] git://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git x86/vmap_stack [2] https://git.kernel.org/cgit/linux/kernel/git/luto/linux.git/log/?h=x86/vmap_stack [3] git://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git arm64/ti-stack-split [4] https://git.kernel.org/cgit/linux/kernel/git/mark/linux.git/log/?h=arm64/ti-stack-split Mark Rutland (8): thread_info: include <current.h> for THREAD_INFO_IN_TASK thread_info: allow custom in-task thread_info arm64: thread_info remove stale items arm64: asm-offsets: remove unused definitions arm64: assembler: introduce ldr_this_cpu arm64: traps: use task_struct instead of thread_info arm64: move sp_el0 and tpidr_el1 into cpu_suspend_ctx arm64: split thread_info from task stack arch/arm64/Kconfig | 2 ++ arch/arm64/include/asm/Kbuild | 1 - arch/arm64/include/asm/assembler.h | 19 +++++++++++++++---- arch/arm64/include/asm/current.h | 22 ++++++++++++++++++++++ arch/arm64/include/asm/smp.h | 1 + arch/arm64/include/asm/suspend.h | 2 +- arch/arm64/include/asm/thread_info.h | 21 --------------------- arch/arm64/kernel/asm-offsets.c | 3 +-- arch/arm64/kernel/entry.S | 6 +++--- arch/arm64/kernel/head.S | 11 +++++------ arch/arm64/kernel/process.c | 31 ++++++++++++++++++++++++++----- arch/arm64/kernel/sleep.S | 3 --- arch/arm64/kernel/smp.c | 2 ++ arch/arm64/kernel/stacktrace.c | 5 +++++ arch/arm64/kernel/suspend.c | 6 ------ arch/arm64/kernel/traps.c | 12 ++++++------ arch/arm64/mm/proc.S | 6 ++++++ include/linux/thread_info.h | 4 +++- init/Kconfig | 3 +++ 19 files changed, 101 insertions(+), 59 deletions(-) create mode 100644 arch/arm64/include/asm/current.h -- 1.9.1
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[RFC PATCH 0/8] arm64: move thread_info off of the task stack Mark Rutland <mark.rutland@arm.com> - 2016-09-15 15:50 +0200
[RFC PATCH 8/8] arm64: split thread_info from task stack Mark Rutland <mark.rutland@arm.com> - 2016-09-15 16:00 +0200
[RFC PATCH 5/8] arm64: assembler: introduce ldr_this_cpu Mark Rutland <mark.rutland@arm.com> - 2016-09-15 16:00 +0200
[RFC PATCH 4/8] arm64: asm-offsets: remove unused definitions Mark Rutland <mark.rutland@arm.com> - 2016-09-15 16:00 +0200
[RFC PATCH 1/8] thread_info: include <current.h> for THREAD_INFO_IN_TASK Mark Rutland <mark.rutland@arm.com> - 2016-09-15 16:00 +0200
[RFC PATCH 3/8] arm64: thread_info remove stale items Mark Rutland <mark.rutland@arm.com> - 2016-09-15 16:00 +0200
[RFC PATCH 7/8] arm64: move sp_el0 and tpidr_el1 into cpu_suspend_ctx Mark Rutland <mark.rutland@arm.com> - 2016-09-15 16:00 +0200
[RFC PATCH 2/8] thread_info: allow custom in-task thread_info Mark Rutland <mark.rutland@arm.com> - 2016-09-15 16:00 +0200
Re: [RFC PATCH 2/8] thread_info: allow custom in-task thread_info Andy Lutomirski <luto@amacapital.net> - 2016-09-15 20:40 +0200
Re: [RFC PATCH 2/8] thread_info: allow custom in-task thread_info Mark Rutland <mark.rutland@arm.com> - 2016-09-16 12:40 +0200
Re: [RFC PATCH 2/8] thread_info: allow custom in-task thread_info Andy Lutomirski <luto@amacapital.net> - 2016-09-16 17:20 +0200
Re: [RFC PATCH 2/8] thread_info: allow custom in-task thread_info Mark Rutland <mark.rutland@arm.com> - 2016-09-19 12:50 +0200
Re: [RFC PATCH 2/8] thread_info: allow custom in-task thread_info Mark Rutland <mark.rutland@arm.com> - 2016-09-21 12:30 +0200
Re: [RFC PATCH 2/8] thread_info: allow custom in-task thread_info Andy Lutomirski <luto@amacapital.net> - 2016-09-23 00:30 +0200
[RFC PATCH 6/8] arm64: traps: use task_struct instead of thread_info Mark Rutland <mark.rutland@arm.com> - 2016-09-15 16:00 +0200
Re: [RFC PATCH 0/8] arm64: move thread_info off of the task stack Laura Abbott <labbott@redhat.com> - 2016-09-21 03:30 +0200
Re: [RFC PATCH 0/8] arm64: move thread_info off of the task stack Mark Rutland <mark.rutland@arm.com> - 2016-09-21 12:40 +0200
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