linux-kernel - [tip: x86/mm] cpumask: Mark functions as pure

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Date:   Tue, 02 Mar 2021 09:54:47 -0000
From:   "tip-bot2 for Nadav Amit" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Nadav Amit <namit@...are.com>, Ingo Molnar <mingo@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/mm] cpumask: Mark functions as pure

The following commit has been merged into the x86/mm branch of tip:

Commit-ID:     1028a5918cbaae6b9d7f0a04b6a200b9e67aec14
Gitweb:        https://git.kernel.org/tip/1028a5918cbaae6b9d7f0a04b6a200b9e67aec14
Author:        Nadav Amit <namit@...are.com>
AuthorDate:    Sat, 20 Feb 2021 15:17:10 -08:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Tue, 02 Mar 2021 08:01:38 +01:00

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>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Reviewed-by: Dave Hansen <dave.hansen@...ux.intel.com>
Link: https://lore.kernel.org/r/20210220231712.2475218-8-namit@vmware.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 383684e..c53364c 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);
+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);
 int cpumask_any_and_distribute(const struct cpumask *src1p,
 			       const struct cpumask *src2p);