lib/cpumask: add FORCE_NR_CPUS config option

The size of cpumasks is hard-limited by compile-time parameter NR_CPUS,
but defined at boot-time when kernel parses ACPI/DT tables, and stored in
nr_cpu_ids. In many practical cases, number of CPUs for a target is known
at compile time, and can be provided with NR_CPUS.

In that case, compiler may be instructed to rely on NR_CPUS as on actual
number of CPUs, not an upper limit. It allows to optimize many cpumask
routines and significantly shrink size of the kernel image.

This patch adds FORCE_NR_CPUS option to teach the compiler to rely on
NR_CPUS and enable corresponding optimizations.

If FORCE_NR_CPUS=y, kernel will not set nr_cpu_ids at boot, but only check
that the actual number of possible CPUs is equal to NR_CPUS, and WARN if
that doesn't hold.

The new option is especially useful in embedded applications because
kernel configurations are unique for each SoC, the number of CPUs is
constant and known well, and memory limitations are typically harder.

For my 4-CPU ARM64 build with NR_CPUS=4, FORCE_NR_CPUS=y saves 46KB:
  add/remove: 3/4 grow/shrink: 46/729 up/down: 652/-46952 (-46300)

Signed-off-by: Yury Norov <yury.norov@gmail.com>

diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index 2f6622cead1fbbcf527e2685de7a43f325b9796e..1b442fb2001f4b9e7746ff13b35d017e43ac28be 100644 (file)
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -35,16 +35,20 @@ typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t;
  */
 #define cpumask_pr_args(maskp)         nr_cpu_ids, cpumask_bits(maskp)
 
-#if NR_CPUS == 1
-#define nr_cpu_ids             1U
+#if (NR_CPUS == 1) || defined(CONFIG_FORCE_NR_CPUS)
+#define nr_cpu_ids ((unsigned int)NR_CPUS)
 #else
 extern unsigned int nr_cpu_ids;
+#endif
 
 static inline void set_nr_cpu_ids(unsigned int nr)
 {
+#if (NR_CPUS == 1) || defined(CONFIG_FORCE_NR_CPUS)
+       WARN_ON(nr != nr_cpu_ids);
+#else
        nr_cpu_ids = nr;
-}
 #endif
+}
 
 /* Deprecated. Always use nr_cpu_ids. */
 #define nr_cpumask_bits        nr_cpu_ids

diff --git a/kernel/smp.c b/kernel/smp.c
index 150310a0947a63386d14a937bd6ae6069fdc962f..661d09ae5d6aa2eaeb9e318b69a6fe038ec92f75 100644 (file)
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -1088,7 +1088,7 @@ static int __init maxcpus(char *str)
 
 early_param("maxcpus", maxcpus);
 
-#if (NR_CPUS > 1)
+#if (NR_CPUS > 1) && !defined(CONFIG_FORCE_NR_CPUS)
 /* Setup number of possible processor ids */
 unsigned int nr_cpu_ids __read_mostly = NR_CPUS;
 EXPORT_SYMBOL(nr_cpu_ids);

diff --git a/lib/Kconfig b/lib/Kconfig
index dc1ab2ed1dc6e7d19b9aa492081da04d6a40fee2..77ead982c8b9d31b25a8c7c343137bde96c1f280 100644 (file)
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -527,6 +527,15 @@ config CPUMASK_OFFSTACK
          them on the stack.  This is a bit more expensive, but avoids
          stack overflow.
 
+config FORCE_NR_CPUS
+       bool "NR_CPUS is set to an actual number of CPUs"
+       depends on SMP
+       help
+         Say Yes if you have NR_CPUS set to an actual number of possible
+         CPUs in your system, not to a default value. This forces the core
+         code to rely on compile-time value and optimize kernel routines
+         better.
+
 config CPU_RMAP
        bool
        depends on SMP