[Bug runtime/30456] New: Kernel 5.18+ retired set_fs() and replaced it with the user_access_begin/end() pair for userland memory accesses

[agentzh at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=30456

            Bug ID: 30456
           Summary: Kernel 5.18+ retired set_fs() and replaced it with the
                    user_access_begin/end() pair for userland memory
                    accesses
           Product: systemtap
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: agentzh at gmail dot com
  Target Milestone: ---

Currently, the stap runtime does nothing for kernel 5.18+ without set_fs(),
which is wrong at least on x86 for userland accesses.

I'm preparing a fix by switching to the new replacement API,
user_access_begin() and user_access_end().

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