x86/entry: Move irq tracing on syscall entry to C-code

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Now that the C entry points are safe, move the irq flags tracing code into
the entry helper:

    - Invoke lockdep before calling into context tracking

    - Use the safe trace_hardirqs_on_prepare() trace function after context
      tracking established state and RCU is watching.

enter_from_user_mode() is also still invoked from the exception/interrupt
entry code which still contains the ASM irq flags tracing. So this is just
a redundant and harmless invocation of tracing / lockdep until these are
removed as well.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200505134340.611961721@linutronix.de

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This commit is contained in:

Thomas Gleixner 2020-02-25 23:08:05 +01:00

parent 8f159f1dfa

commit dd8e2d9ae6

4 changed files with 19 additions and 34 deletions

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21

arch/x86/entry/common.c

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12

arch/x86/entry/entry_32.S

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2

arch/x86/entry/entry_64.S

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18

arch/x86/entry/entry_64_compat.S

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