linux-kernel - [PATCH v2 7/9] cpumask: Mark functions as pure

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Date:   Tue,  2 Jul 2019 16:51:49 -0700
From:   Nadav Amit <namit@...are.com>
To:     Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Nadav Amit <namit@...are.com>
Subject: [PATCH v2 7/9] cpumask: Mark functions as pure

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().

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 693124900f0a..8decc46ca0ce 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -211,7 +211,7 @@ 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
@@ -228,8 +228,8 @@ 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);
+int __pure cpumask_next_and(int n, const struct cpumask *, const struct cpumask *);
+int __pure cpumask_any_but(const struct cpumask *mask, unsigned int cpu);
 unsigned int cpumask_local_spread(unsigned int i, int node);
 
 /**
-- 
2.17.1