linux-kernel - [PATCH v4 1/5] asm-generic: barrier: Add smp_cond_load_relaxed

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20250829080735.3598416-2-ankur.a.arora@oracle.com>
Date: Fri, 29 Aug 2025 01:07:31 -0700
From: Ankur Arora <ankur.a.arora@...cle.com>
To: linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, bpf@...r.kernel.org
Cc: arnd@...db.de, catalin.marinas@....com, will@...nel.org,
        peterz@...radead.org, akpm@...ux-foundation.org, mark.rutland@....com,
        harisokn@...zon.com, cl@...two.org, ast@...nel.org, memxor@...il.com,
        zhenglifeng1@...wei.com, xueshuai@...ux.alibaba.com,
        joao.m.martins@...cle.com, boris.ostrovsky@...cle.com,
        konrad.wilk@...cle.com
Subject: [PATCH v4 1/5] asm-generic: barrier: Add smp_cond_load_relaxed_timewait()

Add smp_cond_load_relaxed_timewait(), which extends
smp_cond_load_relaxed() to allow waiting for a finite duration.

The additional parameter allows for the timeout check.

The waiting is done via the usual cpu_relax() spin-wait around the
condition variable with periodic evaluation of the time-check.

The number of times we spin is defined by SMP_TIMEWAIT_SPIN_COUNT
(chosen to be 200 by default) which, assuming each cpu_relax()
iteration takes around 20-30 cycles (measured on a variety of x86
platforms), amounts to around 4000-6000 cycles.

Cc: Arnd Bergmann <arnd@...db.de>
Cc: Will Deacon <will@...nel.org>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: linux-arch@...r.kernel.org
Signed-off-by: Ankur Arora <ankur.a.arora@...cle.com>
---
 include/asm-generic/barrier.h | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/include/asm-generic/barrier.h b/include/asm-generic/barrier.h
index d4f581c1e21d..c87d6fd8746f 100644
--- a/include/asm-generic/barrier.h
+++ b/include/asm-generic/barrier.h
@@ -273,6 +273,41 @@ do {									\
 })
 #endif
 
+#ifndef SMP_TIMEWAIT_SPIN_COUNT
+#define SMP_TIMEWAIT_SPIN_COUNT		200
+#endif
+
+/**
+ * smp_cond_load_relaxed_timewait() - (Spin) wait for cond with no ordering
+ * guarantees until a timeout expires.
+ * @ptr: pointer to the variable to wait on
+ * @cond: boolean expression to wait for
+ * @time_check_expr: expression to decide when to bail out
+ *
+ * Equivalent to using READ_ONCE() on the condition variable.
+ */
+#ifndef smp_cond_load_relaxed_timewait
+#define smp_cond_load_relaxed_timewait(ptr, cond_expr, time_check_expr)	\
+({									\
+	typeof(ptr) __PTR = (ptr);					\
+	__unqual_scalar_typeof(*ptr) VAL;				\
+	u32 __n = 0, __spin = SMP_TIMEWAIT_SPIN_COUNT;			\
+									\
+	for (;;) {							\
+		VAL = READ_ONCE(*__PTR);				\
+		if (cond_expr)						\
+			break;						\
+		cpu_relax();						\
+		if (++__n < __spin)					\
+			continue;					\
+		if (time_check_expr)					\
+			break;						\
+		__n = 0;						\
+	}								\
+	(typeof(*ptr))VAL;						\
+})
+#endif
+
 /*
  * pmem_wmb() ensures that all stores for which the modification
  * are written to persistent storage by preceding instructions have
-- 
2.31.1