[xen staging] automation/eclair: add deviation for MISRA C Rule 17.7

[patchbot@xxxxxxx]

commit 912412f97a293f5e1deece134d78c52b1b0b8856
Author:     Federico Serafini <federico.serafini@xxxxxxxxxxx>
AuthorDate: Fri Jun 14 11:15:38 2024 +0200
Commit:     Stefano Stabellini <stefano.stabellini@xxxxxxx>
CommitDate: Mon Jun 24 16:39:09 2024 -0700

    automation/eclair: add deviation for MISRA C Rule 17.7
    
    Update ECLAIR configuration to deviate some cases where not using
    the return value of a function is not dangerous.
    
    Signed-off-by: Federico Serafini <federico.serafini@xxxxxxxxxxx>
    Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
    Release-Acked-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
 automation/eclair_analysis/ECLAIR/deviations.ecl | 4 ++++
 docs/misra/deviations.rst                        | 9 +++++++++
 2 files changed, 13 insertions(+)

diff --git a/automation/eclair_analysis/ECLAIR/deviations.ecl 
b/automation/eclair_analysis/ECLAIR/deviations.ecl
index e2653f77eb..89345a9d08 100644
--- a/automation/eclair_analysis/ECLAIR/deviations.ecl
+++ b/automation/eclair_analysis/ECLAIR/deviations.ecl
@@ -413,6 +413,10 @@ explicit comment indicating the fallthrough intention is 
present."
 -config=MC3R1.R17.1,macros+={hide , "^va_(arg|start|copy|end)$"}
 -doc_end
 
+-doc_begin="Not using the return value of a function does not endanger safety 
if it coincides with an actual argument."
+-config=MC3R1.R17.7,calls+={safe, "any()", 
"decl(name(__builtin_memcpy||__builtin_memmove||__builtin_memset||cpumask_check))"}
+-doc_end
+
 #
 # Series 18.
 #
diff --git a/docs/misra/deviations.rst b/docs/misra/deviations.rst
index 36959aa44a..679d8c885f 100644
--- a/docs/misra/deviations.rst
+++ b/docs/misra/deviations.rst
@@ -364,6 +364,15 @@ Deviations related to MISRA C:2012 Rules:
        by `stdarg.h`.
      - Tagged as `deliberate` for ECLAIR.
 
+   * - R17.7
+     - Not using the return value of a function does not endanger safety if it
+       coincides with an actual argument.
+     - Tagged as `safe` for ECLAIR. Such functions are:
+         - __builtin_memcpy()
+         - __builtin_memmove()
+         - __builtin_memset()
+         - cpumask_check()
+
    * - R20.4
      - The override of the keyword \"inline\" in xen/compiler.h is present so
        that section contents checks pass when the compiler chooses not to
--
generated by git-patchbot for /home/xen/git/xen.git#staging