linux-kernel - [PATCH v5 7/8] cpumask: Mark functions as pure

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Message-Id: <20210209221653.614098-8-namit@vmware.com>
Date:   Tue,  9 Feb 2021 14:16:52 -0800
From:   Nadav Amit <nadav.amit@...il.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Nadav Amit <namit@...are.com>
Subject: [PATCH v5 7/8] cpumask: Mark functions as pure

From: Nadav Amit <namit@...are.com>

cpumask_next_and() and cpumask_any_but() are pure, and marking them as
such seems to generate different and presumably better code for
native_flush_tlb_multi().

Reviewed-by: Dave Hansen <dave.hansen@...ux.intel.com>
Signed-off-by: Nadav Amit <namit@...are.com>
---
 include/linux/cpumask.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index 383684e30f12..e86b7d027cfb 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -235,7 +235,7 @@ static inline unsigned int cpumask_last(const struct cpumask *srcp)
 	return find_last_bit(cpumask_bits(srcp), nr_cpumask_bits);
 }
 
-unsigned int cpumask_next(int n, const struct cpumask *srcp);
+unsigned int __pure cpumask_next(int n, const struct cpumask *srcp);
 
 /**
  * cpumask_next_zero - get the next unset cpu in a cpumask
@@ -252,8 +252,8 @@ static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
 	return find_next_zero_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1);
 }
 
-int cpumask_next_and(int n, const struct cpumask *, const struct cpumask *);
-int cpumask_any_but(const struct cpumask *mask, unsigned int cpu);
+__pure int cpumask_next_and(int n, const struct cpumask *, const struct cpumask *);
+__pure int cpumask_any_but(const struct cpumask *mask, unsigned int cpu);
 unsigned int cpumask_local_spread(unsigned int i, int node);
 int cpumask_any_and_distribute(const struct cpumask *src1p,
 			       const struct cpumask *src2p);
-- 
2.25.1