linux-kernel - [PATCH] Revert "cpumask: fix checking valid cpu range"

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Message-Id: <20221015130548.3634468-1-guoren@kernel.org>
Date:   Sat, 15 Oct 2022 09:05:48 -0400
From:   guoren@...nel.org
To:     andriy.shevchenko@...ux.intel.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        linux@...musvillemoes.dk, yury.norov@...il.com,
        caraitto@...gle.com, willemb@...gle.com, jonolson@...gle.com,
        amritha.nambiar@...el.com
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Guo Ren <guoren@...ux.alibaba.com>, Guo Ren <guoren@...nel.org>
Subject: [PATCH] Revert "cpumask: fix checking valid cpu range"

From: Guo Ren <guoren@...ux.alibaba.com>

This reverts commit 78e5a3399421ad79fc024e6d78e2deb7809d26af.

------------[ cut here ]------------
WARNING: CPU: 3 PID: 1 at include/linux/cpumask.h:110 cpumask_next_wrap+0x5c/0x80

Let's back this out and retry with a larger clean up in -next.

Fixes: 78e5a3399421 ("cpumask: fix checking valid cpu range")
Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
Signed-off-by: Guo Ren <guoren@...nel.org>
Cc: Jakub Kicinski <kuba@...nel.org>
---
 include/linux/cpumask.h | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index 2f065ad97541..c2aa0aa26b45 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -174,8 +174,9 @@ static inline unsigned int cpumask_last(const struct cpumask *srcp)
 static inline
 unsigned int cpumask_next(int n, const struct cpumask *srcp)
 {
-	/* n is a prior cpu */
-	cpumask_check(n + 1);
+	/* -1 is a legal arg here. */
+	if (n != -1)
+		cpumask_check(n);
 	return find_next_bit(cpumask_bits(srcp), nr_cpumask_bits, n + 1);
 }
 
@@ -188,8 +189,9 @@ unsigned int cpumask_next(int n, const struct cpumask *srcp)
  */
 static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
 {
-	/* n is a prior cpu */
-	cpumask_check(n + 1);
+	/* -1 is a legal arg here. */
+	if (n != -1)
+		cpumask_check(n);
 	return find_next_zero_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1);
 }
 
@@ -229,8 +231,9 @@ static inline
 unsigned int cpumask_next_and(int n, const struct cpumask *src1p,
 		     const struct cpumask *src2p)
 {
-	/* n is a prior cpu */
-	cpumask_check(n + 1);
+	/* -1 is a legal arg here. */
+	if (n != -1)
+		cpumask_check(n);
 	return find_next_and_bit(cpumask_bits(src1p), cpumask_bits(src2p),
 		nr_cpumask_bits, n + 1);
 }
@@ -260,8 +263,8 @@ static inline
 unsigned int cpumask_next_wrap(int n, const struct cpumask *mask, int start, bool wrap)
 {
 	cpumask_check(start);
-	/* n is a prior cpu */
-	cpumask_check(n + 1);
+	if (n != -1)
+		cpumask_check(n);
 
 	/*
 	 * Return the first available CPU when wrapping, or when starting before cpu0,
-- 
2.36.1