From: Eliav Farber <farbere@amazon•com>
To: <gregkh@linuxfoundation•org>, <stable@vger•kernel.org>,
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Cc: Arnd Bergmann <arnd@arndb•de>,
Dan Williams <dan.j.williams@intel•com>,
Eric Dumazet <edumazet@google•com>,
Isabella Basso <isabbasso@riseup•net>,
Josh Poimboeuf <jpoimboe@kernel•org>,
Masami Hiramatsu <mhiramat@kernel•org>,
Sander Vanheule <sander@svanheule•net>,
Vlastimil Babka <vbabka@suse•cz>,
Yury Norov <yury.norov@gmail•com>
Subject: [PATCH v2 01/27 5.10.y] overflow, tracing: Define the is_signed_type() macro once
Date: Fri, 17 Oct 2025 09:04:53 +0000 [thread overview]
Message-ID: <20251017090519.46992-2-farbere@amazon.com> (raw)
In-Reply-To: <20251017090519.46992-1-farbere@amazon.com>
From: Bart Van Assche <bvanassche@acm•org>
[ Upstream commit 92d23c6e94157739b997cacce151586a0d07bb8a ]
There are two definitions of the is_signed_type() macro: one in
<linux/overflow.h> and a second definition in <linux/trace_events.h>.
As suggested by Linus Torvalds, move the definition of the
is_signed_type() macro into the <linux/compiler.h> header file. Change
the definition of the is_signed_type() macro to make sure that it does
not trigger any sparse warnings with future versions of sparse for
bitwise types. See also:
https://lore.kernel.org/all/CAHk-=whjH6p+qzwUdx5SOVVHjS3WvzJQr6mDUwhEyTf6pJWzaQ@mail.gmail.com/
https://lore.kernel.org/all/CAHk-=wjQGnVfb4jehFR0XyZikdQvCZouE96xR_nnf5kqaM5qqQ@mail.gmail.com/
Cc: Andrew Morton <akpm@linux-foundation•org>
Cc: Arnd Bergmann <arnd@arndb•de>
Cc: Dan Williams <dan.j.williams@intel•com>
Cc: Eric Dumazet <edumazet@google•com>
Cc: Ingo Molnar <mingo@redhat•com>
Cc: Isabella Basso <isabbasso@riseup•net>
Cc: "Jason A. Donenfeld" <Jason@zx2c4•com>
Cc: Josh Poimboeuf <jpoimboe@kernel•org>
Cc: Luc Van Oostenryck <luc.vanoostenryck@gmail•com>
Cc: Masami Hiramatsu <mhiramat@kernel•org>
Cc: Nathan Chancellor <nathan@kernel•org>
Cc: Peter Zijlstra <peterz@infradead•org>
Cc: Rasmus Villemoes <linux@rasmusvillemoes•dk>
Cc: Sander Vanheule <sander@svanheule•net>
Cc: Steven Rostedt <rostedt@goodmis•org>
Cc: Vlastimil Babka <vbabka@suse•cz>
Cc: Yury Norov <yury.norov@gmail•com>
Signed-off-by: Bart Van Assche <bvanassche@acm•org>
Signed-off-by: Kees Cook <keescook@chromium•org>
Link: https://lore.kernel.org/r/20220826162116.1050972-3-bvanassche@acm.org
Signed-off-by: Eliav Farber <farbere@amazon•com>
---
include/linux/compiler.h | 6 ++++++
include/linux/overflow.h | 1 -
include/linux/trace_events.h | 2 --
3 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index bbd74420fa21..004a030d5ad2 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -245,6 +245,12 @@ static inline void *offset_to_ptr(const int *off)
/* &a[0] degrades to a pointer: a different type from an array */
#define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
+/*
+ * Whether 'type' is a signed type or an unsigned type. Supports scalar types,
+ * bool and also pointer types.
+ */
+#define is_signed_type(type) (((type)(-1)) < (__force type)1)
+
/*
* This is needed in functions which generate the stack canary, see
* arch/x86/kernel/smpboot.c::start_secondary() for an example.
diff --git a/include/linux/overflow.h b/include/linux/overflow.h
index 73bc67ec2136..e6bf14f462e9 100644
--- a/include/linux/overflow.h
+++ b/include/linux/overflow.h
@@ -29,7 +29,6 @@
* https://mail-index.netbsd.org/tech-misc/2007/02/05/0000.html -
* credit to Christian Biere.
*/
-#define is_signed_type(type) (((type)(-1)) < (type)1)
#define __type_half_max(type) ((type)1 << (8*sizeof(type) - 1 - is_signed_type(type)))
#define type_max(T) ((T)((__type_half_max(T) - 1) + __type_half_max(T)))
#define type_min(T) ((T)((T)-type_max(T)-(T)1))
diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h
index 5af2acb9fb7d..0c8c3cf36f96 100644
--- a/include/linux/trace_events.h
+++ b/include/linux/trace_events.h
@@ -700,8 +700,6 @@ extern int trace_add_event_call(struct trace_event_call *call);
extern int trace_remove_event_call(struct trace_event_call *call);
extern int trace_event_get_offsets(struct trace_event_call *call);
-#define is_signed_type(type) (((type)(-1)) < (type)1)
-
int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set);
int trace_set_clr_event(const char *system, const char *event, int set);
int trace_array_set_clr_event(struct trace_array *tr, const char *system,
--
2.47.3
next prev parent reply other threads:[~2025-10-17 9:05 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-17 9:04 [PATCH v2 00/27 5.10.y] Backport minmax.h updates from v6.17-rc7 Eliav Farber
2025-10-17 9:04 ` Eliav Farber [this message]
2025-10-17 11:59 ` [PATCH v2 01/27 5.10.y] overflow, tracing: Define the is_signed_type() macro once Greg KH
2025-10-17 12:16 ` Farber, Eliav
2025-10-17 13:21 ` Greg KH
2025-10-17 9:04 ` [PATCH v2 02/27 5.10.y] btrfs: remove duplicated in_range() macro Eliav Farber
2025-10-17 9:04 ` [PATCH v2 03/27 5.10.y] minmax: sanity check constant bounds when clamping Eliav Farber
2025-10-17 9:04 ` [PATCH v2 04/27 5.10.y] minmax: clamp more efficiently by avoiding extra comparison Eliav Farber
2025-10-17 9:04 ` [PATCH v2 05/27 5.10.y] minmax: add in_range() macro Eliav Farber
2025-10-17 9:04 ` [PATCH v2 06/27 5.10.y] minmax: Introduce {min,max}_array() Eliav Farber
2025-10-17 9:04 ` [PATCH v2 07/27 5.10.y] minmax: deduplicate __unconst_integer_typeof() Eliav Farber
2025-10-17 9:05 ` [PATCH v2 08/27 5.10.y] minmax: fix header inclusions Eliav Farber
2025-10-17 9:05 ` [PATCH v2 09/27 5.10.y] minmax: allow min()/max()/clamp() if the arguments have the same signedness Eliav Farber
2025-10-17 9:05 ` [PATCH v2 10/27 5.10.y] minmax: fix indentation of __cmp_once() and __clamp_once() Eliav Farber
2025-10-17 9:05 ` [PATCH v2 11/27 5.10.y] minmax: allow comparisons of 'int' against 'unsigned char/short' Eliav Farber
2025-10-17 9:05 ` [PATCH v2 12/27 5.10.y] minmax: relax check to allow comparison between unsigned arguments and signed constants Eliav Farber
2025-10-17 9:05 ` [PATCH v2 13/27 5.10.y] minmax: avoid overly complicated constant expressions in VM code Eliav Farber
2025-10-17 9:05 ` [PATCH v2 14/27 5.10.y] minmax: add a few more MIN_T/MAX_T users Eliav Farber
2025-10-17 9:05 ` [PATCH v2 15/27 5.10.y] minmax: simplify and clarify min_t()/max_t() implementation Eliav Farber
2025-10-17 9:05 ` [PATCH v2 16/27 5.10.y] minmax: make generic MIN() and MAX() macros available everywhere Eliav Farber
2025-10-17 9:05 ` [PATCH v2 17/27 5.10.y] minmax: don't use max() in situations that want a C constant expression Eliav Farber
2025-10-17 9:05 ` [PATCH v2 18/27 5.10.y] minmax: simplify min()/max()/clamp() implementation Eliav Farber
2025-10-17 9:05 ` [PATCH v2 19/27 5.10.y] minmax: improve macro expansion and type checking Eliav Farber
2025-10-17 9:05 ` [PATCH v2 20/27 5.10.y] minmax: fix up min3() and max3() too Eliav Farber
2025-10-17 9:05 ` [PATCH v2 21/27 5.10.y] minmax.h: add whitespace around operators and after commas Eliav Farber
2025-10-17 9:05 ` [PATCH v2 22/27 5.10.y] minmax.h: update some comments Eliav Farber
2025-10-17 9:05 ` [PATCH v2 23/27 5.10.y] minmax.h: reduce the #define expansion of min(), max() and clamp() Eliav Farber
2025-10-17 9:05 ` [PATCH v2 24/27 5.10.y] minmax.h: use BUILD_BUG_ON_MSG() for the lo < hi test in clamp() Eliav Farber
2025-10-17 9:05 ` [PATCH v2 25/27 5.10.y] minmax.h: move all the clamp() definitions after the min/max() ones Eliav Farber
2025-10-17 9:05 ` [PATCH v2 26/27 5.10.y] minmax.h: simplify the variants of clamp() Eliav Farber
2025-10-17 9:05 ` [PATCH v2 27/27 5.10.y] minmax.h: remove some #defines that are only expanded once Eliav Farber
2025-10-17 15:03 ` [PATCH v2 00/27 5.10.y] Backport minmax.h updates from v6.17-rc7 Greg KH
2025-10-17 16:09 ` Nathan Chancellor
2025-10-19 12:38 ` Greg KH
2025-10-18 20:07 ` Farber, Eliav
2025-10-19 12:37 ` Greg KH
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