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compiler.h: introduce TYPEOF_UNQUAL() macro

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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: Uros 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: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Uros Bizjak 2025-01-27 17:05:06 +01:00 • committed by Andrew Morton
parent 6b7ce3134f
commit ac053946f5
3 changed files with 36 additions and 0 deletions
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8
include/linux/compiler-clang.h
View file

@ -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)

8
include/linux/compiler-gcc.h
View file

@ -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)

20
include/linux/compiler.h
View file

@ -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__ */
/**