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Date: Sat, 2 Jul 2022 18:08:25 +0200
From: Sander Vanheule <sander@...nheule.net>
To: x86@...nel.org, linux-kernel@...r.kernel.org
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
elver@...gle.com, gregkh@...uxfoundation.org,
Peter Zijlstra <peterz@...radead.org>,
Thomas Gleixner <tglx@...utronix.de>, vschneid@...hat.com,
Yury Norov <yury.norov@...il.com>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>,
"H . Peter Anvin" <hpa@...or.com>,
Sander Vanheule <sander@...nheule.net>
Subject: [PATCH v4 2/5] cpumask: Fix invalid uniprocessor mask assumption
On uniprocessor builds, any CPU mask is assumed to contain exactly one
CPU (cpu0). This assumption ignores the existence of empty masks,
resulting in incorrect behaviour.
cpumask_first_zero(), cpumask_next_zero(), and for_each_cpu_not() don't
provide behaviour matching the assumption that a UP mask is always "1",
and instead provide behaviour matching the empty mask.
Drop the incorrectly optimised code and use the generic implementations
in all cases.
Signed-off-by: Sander Vanheule <sander@...nheule.net>
---
Notes:
Changes since v3:
- Add back UP-optimised cpumask_local_spread, cpumask_any_distribute,
cpumask_any_and_distribute
Changes since v1:
- Drop UP implementations instead of trying to fix them
include/linux/cpumask.h | 99 ++++++++---------------------------------
lib/Makefile | 3 +-
lib/cpumask.c | 2 +
3 files changed, 22 insertions(+), 82 deletions(-)
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index fe29ac7cc469..7fbef41b3093 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -116,85 +116,6 @@ static __always_inline unsigned int cpumask_check(unsigned int cpu)
return cpu;
}
-#if NR_CPUS == 1
-/* Uniprocessor. Assume all masks are "1". */
-static inline unsigned int cpumask_first(const struct cpumask *srcp)
-{
- return 0;
-}
-
-static inline unsigned int cpumask_first_zero(const struct cpumask *srcp)
-{
- return 0;
-}
-
-static inline unsigned int cpumask_first_and(const struct cpumask *srcp1,
- const struct cpumask *srcp2)
-{
- return 0;
-}
-
-static inline unsigned int cpumask_last(const struct cpumask *srcp)
-{
- return 0;
-}
-
-/* Valid inputs for n are -1 and 0. */
-static inline unsigned int cpumask_next(int n, const struct cpumask *srcp)
-{
- return n+1;
-}
-
-static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
-{
- return n+1;
-}
-
-static inline unsigned int cpumask_next_and(int n,
- const struct cpumask *srcp,
- const struct cpumask *andp)
-{
- return n+1;
-}
-
-static inline unsigned int cpumask_next_wrap(int n, const struct cpumask *mask,
- int start, bool wrap)
-{
- /* cpu0 unless stop condition, wrap and at cpu0, then nr_cpumask_bits */
- return (wrap && n == 0);
-}
-
-/* cpu must be a valid cpu, ie 0, so there's no other choice. */
-static inline unsigned int cpumask_any_but(const struct cpumask *mask,
- unsigned int cpu)
-{
- return 1;
-}
-
-static inline unsigned int cpumask_local_spread(unsigned int i, int node)
-{
- return 0;
-}
-
-static inline int cpumask_any_and_distribute(const struct cpumask *src1p,
- const struct cpumask *src2p) {
- return cpumask_first_and(src1p, src2p);
-}
-
-static inline int cpumask_any_distribute(const struct cpumask *srcp)
-{
- return cpumask_first(srcp);
-}
-
-#define for_each_cpu(cpu, mask) \
- for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
-#define for_each_cpu_not(cpu, mask) \
- for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
-#define for_each_cpu_wrap(cpu, mask, start) \
- for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask, (void)(start))
-#define for_each_cpu_and(cpu, mask1, mask2) \
- for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask1, (void)mask2)
-#else
/**
* cpumask_first - get the first cpu in a cpumask
* @srcp: the cpumask pointer
@@ -260,10 +181,29 @@ static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
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);
+
+#if NR_CPUS == 1
+/* Uniprocessor: there is only one valid CPU */
+static inline unsigned int cpumask_local_spread(unsigned int i, int node)
+{
+ return 0;
+}
+
+static inline int cpumask_any_and_distribute(const struct cpumask *src1p,
+ const struct cpumask *src2p) {
+ return cpumask_first_and(src1p, src2p);
+}
+
+static inline int cpumask_any_distribute(const struct cpumask *srcp)
+{
+ return cpumask_first(srcp);
+}
+#else
unsigned int cpumask_local_spread(unsigned int i, int node);
int cpumask_any_and_distribute(const struct cpumask *src1p,
const struct cpumask *src2p);
int cpumask_any_distribute(const struct cpumask *srcp);
+#endif /* NR_CPUS */
/**
* for_each_cpu - iterate over every cpu in a mask
@@ -324,7 +264,6 @@ extern int cpumask_next_wrap(int n, const struct cpumask *mask, int start, bool
for ((cpu) = -1; \
(cpu) = cpumask_next_and((cpu), (mask1), (mask2)), \
(cpu) < nr_cpu_ids;)
-#endif /* SMP */
#define CPU_BITS_NONE \
{ \
diff --git a/lib/Makefile b/lib/Makefile
index f99bf61f8bbc..bcc7e8ea0cde 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -34,10 +34,9 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \
is_single_threaded.o plist.o decompress.o kobject_uevent.o \
earlycpio.o seq_buf.o siphash.o dec_and_lock.o \
nmi_backtrace.o nodemask.o win_minmax.o memcat_p.o \
- buildid.o
+ buildid.o cpumask.o
lib-$(CONFIG_PRINTK) += dump_stack.o
-lib-$(CONFIG_SMP) += cpumask.o
lib-y += kobject.o klist.o
obj-y += lockref.o
diff --git a/lib/cpumask.c b/lib/cpumask.c
index a971a82d2f43..b9728513a4d4 100644
--- a/lib/cpumask.c
+++ b/lib/cpumask.c
@@ -192,6 +192,7 @@ void __init free_bootmem_cpumask_var(cpumask_var_t mask)
}
#endif
+#if NR_CPUS > 1
/**
* cpumask_local_spread - select the i'th cpu with local numa cpu's first
* @i: index number
@@ -279,3 +280,4 @@ int cpumask_any_distribute(const struct cpumask *srcp)
return next;
}
EXPORT_SYMBOL(cpumask_any_distribute);
+#endif /* NR_CPUS */
--
2.36.1
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