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SubjectRe: [PATCH v2 1/3] MIPS: kernel: Support extracting off-line stack traces from user-space with perf
On Thu, Feb 04, 2021 at 11:35:22AM +0800, Tiezhu Yang wrote:
> Add perf_event_mips_regs/perf_reg_value/perf_reg_validate to support
> features HAVE_PERF_REGS/HAVE_PERF_USER_STACK_DUMP in kernel.
>
> [ayan@wavecomp.com: Repick this patch for unwinding userstack backtrace
> by perf and libunwind on MIPS based CPU.]
>
> [ralf@linux-mips.org: Add perf_get_regs_user() which is required after
> 'commit 88a7c26af8da ("perf: Move task_pt_regs sampling into arch code")'.]
>
> [yangtiezhu@loongson.cn: Fix build error about perf_get_regs_user() after
> commit 76a4efa80900 ("perf/arch: Remove perf_sample_data::regs_user_copy"),
> and also separate the original patches into two parts (MIPS kernel and perf
> tools) to merge easily.]
>
> The original patches:
> https://lore.kernel.org/patchwork/patch/1126521/
> https://lore.kernel.org/patchwork/patch/1126520/
>
> Signed-off-by: David Daney <david.daney@cavium.com>
> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
> Signed-off-by: Archer Yan <ayan@wavecomp.com>
> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
> ---
>
> v2: add R26 and R27 to the enum perf_event_mips_regs
>
> arch/mips/Kconfig | 2 +
> arch/mips/include/uapi/asm/perf_regs.h | 40 ++++++++++++++++++++
> arch/mips/kernel/Makefile | 2 +-
> arch/mips/kernel/perf_regs.c | 68 ++++++++++++++++++++++++++++++++++
> 4 files changed, 111 insertions(+), 1 deletion(-)
> create mode 100644 arch/mips/include/uapi/asm/perf_regs.h
> create mode 100644 arch/mips/kernel/perf_regs.c

applied to mips-next.

Thomas.

--
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea. [ RFC1925, 2.3 ]

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