linux-kernel - [PATCH: 1/1] sh4: avoid spurious gcc warning

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Date:   Sun, 22 Jan 2023 01:15:17 +0100
From:   "Michael.Karcher" <Michael.Karcher@...berlin.de>
To:     linux-kernel@...r.kernel.org, linux-sh@...r.kernel.org,
        Segher Boessenkool <segher@...nel.crashing.org>,
        Rich Felker <dalias@...c.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
Cc:     jakub@....gnu.org
Subject: [PATCH: 1/1] sh4: avoid spurious gcc warning

Prevent sizeof-pointer-div warning in SH4 intc macros

Gcc warns about the pattern sizeof(void*)/sizeof(void), as it looks like
the abuse of a pattern to calculate the array size. This pattern appears
in the unevaluated part of the ternary operator in _INTC_ARRAY if the
parameter is NULL.

The replacement uses an alternate approach to return 0 in case of NULL
which does not generate the pattern sizeof(void*)/sizeof(void), but still
emits the warning if _INTC_ARRAY is called with a nonarray parameter.

This patch is required for successful compilation with -Werror enabled.

The idea to use _Generic for type distinction is taken from Comment #7
in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108483 by Jakub Jelinek

Signed-off-by: Michael Karcher <kernel@...rcher.dialup.fu-berlin.de>
---

diff --git a/include/linux/sh_intc.h b/include/linux/sh_intc.h
index c255273b0281..d7a7ffb60a34 100644
--- a/include/linux/sh_intc.h
+++ b/include/linux/sh_intc.h
@@ -97,7 +97,7 @@ struct intc_hw_desc {
      unsigned int nr_subgroups;
  };

-#define _INTC_ARRAY(a) a, __same_type(a, NULL) ? 0 : sizeof(a)/sizeof(*a)
+#define _INTC_ARRAY(a) a, sizeof(a)/(_Generic((a), typeof(NULL): 
0xFFFFFFFFU, default: sizeof(*a)))

  #define INTC_HW_DESC(vectors, groups, mask_regs,    \
               prio_regs,    sense_regs, ack_regs)    \