linux-kernel - [PATCH] sparse: use the _Generic() version of __unqual_scalar

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Date:   Fri, 19 Jun 2020 00:26:20 +0200
From:   Luc Van Oostenryck <luc.vanoostenryck@...il.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Marco Elver <elver@...gle.com>, Borislav Petkov <bp@...e.de>,
        Will Deacon <will@...nel.org>
Subject: [PATCH] sparse: use the _Generic() version of __unqual_scalar_typeof()

If the file is being checked with sparse, use the version of
__unqual_scalar_typeof() using _Generic(), leaving the unoptimized
version only for the oldest versions of GCC.

This reverts commit
  b398ace5d2ea ("compiler_types.h: Use unoptimized __unqual_scalar_typeof for sparse")

Note: a recent version of sparse will be needed (minimum v0.6.2-rc2
       or later than 2020-05-28).

Cc: Marco Elver <elver@...gle.com>
Cc: Borislav Petkov <bp@...e.de>
Cc: Will Deacon <will@...nel.org>
Link: https://marc.info/?l=linux-sparse&m=159233481816454
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@...il.com>
---
 include/linux/compiler_types.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h
index e368384445b6..e34a1080f36b 100644
--- a/include/linux/compiler_types.h
+++ b/include/linux/compiler_types.h
@@ -254,7 +254,7 @@ struct ftrace_likely_data {
  * __unqual_scalar_typeof(x) - Declare an unqualified scalar type, leaving
  *			       non-scalar types unchanged.
  */
-#if (defined(CONFIG_CC_IS_GCC) && CONFIG_GCC_VERSION < 40900) || defined(__CHECKER__)
+#if defined(CONFIG_CC_IS_GCC) && CONFIG_GCC_VERSION < 40900
 /*
  * We build this out of a couple of helper macros in a vain attempt to
  * help you keep your lunch down while reading it.
-- 
2.27.0