[PATCH 2/4] Eclair: relax long <-> function-pointer conversion deviation

[Jan Beulich <jbeulich@suse.com>]

What is true for unsigned long is also true for plain/signed long, thus
also taking care of two instances of __x86_return_thunk() being cast to
long.

Signed-off-by: Jan Beulich <jbeulich@suse.com>

--- a/automation/eclair_analysis/ECLAIR/deviations.ecl
+++ b/automation/eclair_analysis/ECLAIR/deviations.ecl
@@ -368,17 +368,17 @@ constant expressions are required.\""
 # Series 11
 #
 
--doc_begin="The conversion from a function pointer to unsigned long or (void *) does not lose any information, provided that the target type has enough bits to store it."
+-doc_begin="The conversion from a function pointer to [unsigned] long or (void *) does not lose any information, provided that the target type has enough bits to store it."
 -config=MC3A2.R11.1,casts+={safe,
   "from(type(canonical(__function_pointer_types)))
-   &&to(type(canonical(builtin(unsigned long)||pointer(builtin(void)))))
+   &&to(type(canonical(builtin(long)||builtin(unsigned long)||pointer(builtin(void)))))
    &&relation(definitely_preserves_value)"
 }
 -doc_end
 
--doc_begin="Conversion from unsigned long or (void *) to a function pointer can restore full information, provided that the source type has enough bits to restore it."
+-doc_begin="Conversion from [unsigned] long or (void *) to a function pointer can restore full information, provided that the source type has enough bits to restore it."
 -config=MC3A2.R11.1,casts+={safe,
-  "from(type(canonical(builtin(unsigned long)||pointer(builtin(void)))))
+  "from(type(canonical(builtin(long)||builtin(unsigned long)||pointer(builtin(void)))))
    &&to(type(canonical(__function_pointer_types)))
    &&relation(definitely_preserves_value)"
 }
--- a/docs/misra/rules.rst
+++ b/docs/misra/rules.rst
@@ -432,8 +432,8 @@ maintainers if you want to suggest a cha
      - All conversions to integer types are permitted if the destination
        type has enough bits to hold the entire value. Conversions to bool
        and void* are permitted. Conversions from 'void noreturn (*)(...)'
-       to 'void (*)(...)' are permitted. Conversions from unsigned long or
-       '(void *)' to a function pointer are permitted.
+       to 'void (*)(...)' are permitted. Conversions from [unsigned] long
+       or '(void *)' to a function pointer are permitted.
        Example::
 
            unsigned long func_addr = (unsigned long)&some_function;