Commit ac053946 authored by Uros Bizjak's avatar Uros Bizjak Committed by Andrew Morton
Browse files

compiler.h: introduce TYPEOF_UNQUAL() macro 

Define TYPEOF_UNQUAL() to use __typeof_unqual__() as typeof operator when
available, to return unqualified type of the expression.

Current version of sparse doesn't know anything about __typeof_unqual__()
operator.  Avoid the usage of __typeof_unqual__() when sparse checking is
active to prevent sparse errors with unknowing keyword.

Link: https://lkml.kernel.org/r/20250127160709.80604-3-ubizjak@gmail.com


Signed-off-by: default avatarUros Bizjak <ubizjak@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Nadav Amit <nadav.amit@gmail.com>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Waiman Long <longman@redhat.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 6b7ce313

include/linux/compiler-clang.h

+8 −0
Original line number Diff line number Diff line
@@ -128,3 +128,11 @@ 
 */

#define ASM_INPUT_G "ir"

#define ASM_INPUT_RM "r"



/*

 * Declare compiler support for __typeof_unqual__() operator.

 *

 * Bindgen uses LLVM even if our C compiler is GCC, so we cannot

 * rely on the auto-detected CONFIG_CC_HAS_TYPEOF_UNQUAL.

 */

#define CC_HAS_TYPEOF_UNQUAL (__clang_major__ >= 19)

include/linux/compiler-gcc.h

+8 −0
Original line number Diff line number Diff line
@@ -137,3 +137,11 @@ 
#if GCC_VERSION < 90100

#undef __alloc_size__

#endif



/*

 * Declare compiler support for __typeof_unqual__() operator.

 *

 * Bindgen uses LLVM even if our C compiler is GCC, so we cannot

 * rely on the auto-detected CONFIG_CC_HAS_TYPEOF_UNQUAL.

 */

#define CC_HAS_TYPEOF_UNQUAL (__GNUC__ >= 14)

include/linux/compiler.h

+20 −0
Original line number Diff line number Diff line
@@ -210,6 +210,26 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val, 
#define __must_be_cstr(p) \

	__BUILD_BUG_ON_ZERO_MSG(__annotated(p, nonstring), "must be cstr (NUL-terminated)")



/*

 * Use __typeof_unqual__() when available.

 *

 * XXX: Remove test for __CHECKER__ once

 * sparse learns about __typeof_unqual__().

 */

#if CC_HAS_TYPEOF_UNQUAL && !defined(__CHECKER__)

# define USE_TYPEOF_UNQUAL 1

#endif



/*

 * Define TYPEOF_UNQUAL() to use __typeof_unqual__() as typeof

 * operator when available, to return an unqualified type of the exp.

 */

#if defined(USE_TYPEOF_UNQUAL)

# define TYPEOF_UNQUAL(exp) __typeof_unqual__(exp)

#else

# define TYPEOF_UNQUAL(exp) __typeof__(exp)

#endif



#endif /* __KERNEL__ */



/**