linux-kernel - [PATCH v1 1/6] compiler.h: Introduce helpers for identifying array and pointer types

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Message-Id: <20231120120837.3002-2-raag.jadav@intel.com>
Date:   Mon, 20 Nov 2023 17:38:32 +0530
From:   Raag Jadav <raag.jadav@...el.com>
To:     mika.westerberg@...ux.intel.com, andriy.shevchenko@...ux.intel.com,
        rafael@...nel.org, lenb@...nel.org, robert.moore@...el.com,
        ardb@...nel.org, will@...nel.org, mark.rutland@....com
Cc:     linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        acpica-devel@...ts.linuxfoundation.org, linux-efi@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        mallikarjunappa.sangannavar@...el.com, bala.senthil@...el.com,
        Raag Jadav <raag.jadav@...el.com>
Subject: [PATCH v1 1/6] compiler.h: Introduce helpers for identifying array and pointer types

Introduce is_array_type() and is_pointer_type() helpers, which compare the
data type of provided argument against the enumeration values defined in
typeclass.h using __builtin_classify_type() function and identify array
and pointer types respectively.

Signed-off-by: Raag Jadav <raag.jadav@...el.com>
---
 include/linux/compiler.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index bb1339c7057b..b4f656002c0f 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -242,6 +242,11 @@ static inline void *offset_to_ptr(const int *off)
 #define is_signed_type(type) (((type)(-1)) < (__force type)1)
 #define is_unsigned_type(type) (!is_signed_type(type))
 
+/* Classify data type based on enum values in typeclass.h */
+#define is_array_type(x)		(__builtin_classify_type(x) == 14)
+#define is_pointer_type(x)		(__builtin_classify_type(x) == 5)
+#define is_array_or_pointer_type(x)	(is_array_type(x) || is_pointer_type(x))
+
 /*
  * This is needed in functions which generate the stack canary, see
  * arch/x86/kernel/smpboot.c::start_secondary() for an example.
-- 
2.17.1