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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/20241208204708.3742696-3-ubizjak@gmail.com
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Acked-by: Nadav Amit <nadav.amit@gmail.com>
Acked-by: Dennis Zhou <dennis@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
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: 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 2024-12-08 21:45:17 +01:00 committed by Andrew Morton
parent 4497834701
commit bf3b91c387
2 changed files with 16 additions and 0 deletions
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13
include/linux/compiler.h
View File

@ -321,6 +321,19 @@ static inline void *offset_to_ptr(const int *off)
*/
#define prevent_tail_call_optimization() mb()
/*
* Define TYPEOF_UNQUAL() to use __typeof_unqual__() as typeof
* operator when available, to return unqualified type of the exp.
*
* XXX: Remove test for __CHECKER__ once
* sparse learns about __typeof_unqual__.
*/
#if defined(CONFIG_CC_HAS_TYPEOF_UNQUAL) && !defined(__CHECKER__)
# define TYPEOF_UNQUAL(exp) __typeof_unqual__(exp)
#else
# define TYPEOF_UNQUAL(exp) __typeof__(exp)
#endif
#include <asm/rwonce.h>
#endif /* __LINUX_COMPILER_H */

3
init/Kconfig
View File

@ -894,6 +894,9 @@ config ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
config CC_HAS_INT128
def_bool !$(cc-option,$(m64-flag) -D__SIZEOF_INT128__=0) && 64BIT
config CC_HAS_TYPEOF_UNQUAL
def_bool $(success,echo 'int foo (int a) { __typeof_unqual__(a) b = a; return b; }' | $(CC) -x c - -S -o /dev/null)
config CC_IMPLICIT_FALLTHROUGH
string
default "-Wimplicit-fallthrough=5" if CC_IS_GCC && $(cc-option,-Wimplicit-fallthrough=5)