kprobes: Remove core dependency on modules
Tracing with kprobes while running a monolithic kernel is currently
impossible because KPROBES depends on MODULES. While this dependency is
necessary when HAVE_KPROBES_ALLOC=n and the core kprobes code allocates
memory using module_alloc(), all the other module-specific code only
exist to handle the case when MODULES=y, and can be hidden behind
ifdeffery.
Add the necessary ifdeffery, and remove the dependency on MODULES=y when
HAVE_KPROBES_ALLOC=y.
As of this patch kprobes can be used when MODULES=n on arm64 and
riscv. All other architectures still depend on MODULES, either by virtue
of the core dependency on MODULES when HAVE_KPROBES_ALLOC=n, or by
virtue of an explciit dependency on MODULES in arch code.
Other architectures can enable support by implementing their own
kprobes_alloc_insn_page() and kprobes_free_insn_page() which do not
depend on MODULES.
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
Link: https://lore.kernel.org/lkml/20240326134616.7691-1-jarkko@kernel.org/
[Mark: Remove execmem changes, depend on HAVE_KPROBES_ALLOC]
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Jarkko Sakkinen <jarkko@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Naveen N. Rao <naveen.n.rao@linux.ibm.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Will Deacon <will@kernel.org>
3 files changed
