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* error-injection: Consolidate override function definitionLeo Yan2019-08-071-13/+0
| | | | | | | | | | | | | | | | | | | | | | | The function override_function_with_return() is defined separately for each architecture and every architecture's definition is almost same with each other. E.g. x86 and powerpc both define function in its own asm/error-injection.h header and override_function_with_return() has the same definition, the only difference is that x86 defines an extra function just_return_func() but it is specific for x86 and is only used by x86's override_function_with_return(), so don't need to export this function. This patch consolidates override_function_with_return() definition into asm-generic/error-injection.h header, thus all architectures can use the common definition. As result, the architecture specific headers are removed; the include/linux/error-injection.h header also changes to include asm-generic/error-injection.h header rather than architecture header, furthermore, it includes linux/compiler.h for successful compilation. Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Leo Yan <leo.yan@linaro.org> Signed-off-by: Will Deacon <will@kernel.org>
* powerpc: Add support for function error injectionNaveen N. Rao2018-10-201-0/+13
We implement regs_set_return_value() and override_function_with_return() for this purpose. On powerpc, a return from a function (blr) just branches to the location contained in the link register. So, we can just update pt_regs rather than redirecting execution to a dummy function that returns. Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Reviewed-by: Samuel Mendoza-Jonas <sam@mendozajonas.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>