This is a note to let you know that I've just added the patch titled

tracing: Allocate mask_str buffer dynamically

to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: tracing-allocate-mask_str-buffer-dynamically.patch and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 90e406f96f630c07d631a021fd4af10aac913e77 Mon Sep 17 00:00:00 2001

From: Changbin Du changbin.du@intel.com Date: Thu, 30 Nov 2017 11:39:43 +0800 Subject: tracing: Allocate mask_str buffer dynamically

From: Changbin Du changbin.du@intel.com

commit 90e406f96f630c07d631a021fd4af10aac913e77 upstream.

The default NR_CPUS can be very large, but actual possible nr_cpu_ids usually is very small. For my x86 distribution, the NR_CPUS is 8192 and nr_cpu_ids is 4. About 2 pages are wasted.

Most machines don't have so many CPUs, so define a array with NR_CPUS just wastes memory. So let's allocate the buffer dynamically when need.

With this change, the mutext tracing_cpumask_update_lock also can be removed now, which was used to protect mask_str.

Link: http://lkml.kernel.org/r/1512013183-19107-1-git-send-email-changbin.du@intel...

Fixes: 36dfe9252bd4c ("ftrace: make use of tracing_cpumask") Signed-off-by: Changbin Du changbin.du@intel.com Signed-off-by: Steven Rostedt (VMware) rostedt@goodmis.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- kernel/trace/trace.c | 29 +++++++++-------------------- 1 file changed, 9 insertions(+), 20 deletions(-)

--- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -4178,37 +4178,30 @@ static const struct file_operations show .llseek = seq_lseek, };

-/* - * The tracer itself will not take this lock, but still we want - * to provide a consistent cpumask to user-space: - */ -static DEFINE_MUTEX(tracing_cpumask_update_lock); - -/* - * Temporary storage for the character representation of the - * CPU bitmask (and one more byte for the newline): - */ -static char mask_str[NR_CPUS + 1]; - static ssize_t tracing_cpumask_read(struct file *filp, char __user *ubuf, size_t count, loff_t *ppos) { struct trace_array *tr = file_inode(filp)->i_private; + char *mask_str; int len;

- mutex_lock(&tracing_cpumask_update_lock); + len = snprintf(NULL, 0, "%*pb\n", + cpumask_pr_args(tr->tracing_cpumask)) + 1; + mask_str = kmalloc(len, GFP_KERNEL); + if (!mask_str) + return -ENOMEM;

- len = snprintf(mask_str, count, "%*pb\n", + len = snprintf(mask_str, len, "%*pb\n", cpumask_pr_args(tr->tracing_cpumask)); if (len >= count) { count = -EINVAL; goto out_err; } - count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1); + count = simple_read_from_buffer(ubuf, count, ppos, mask_str, len);

out_err: - mutex_unlock(&tracing_cpumask_update_lock); + kfree(mask_str);

return count; } @@ -4228,8 +4221,6 @@ tracing_cpumask_write(struct file *filp, if (err) goto err_unlock;

- mutex_lock(&tracing_cpumask_update_lock); - local_irq_disable(); arch_spin_lock(&tr->max_lock); for_each_tracing_cpu(cpu) { @@ -4252,8 +4243,6 @@ tracing_cpumask_write(struct file *filp, local_irq_enable();

cpumask_copy(tr->tracing_cpumask, tracing_cpumask_new); - - mutex_unlock(&tracing_cpumask_update_lock); free_cpumask_var(tracing_cpumask_new);

return count;

Patches currently in stable-queue which might be from changbin.du@intel.com are

queue-4.14/tracing-allocate-mask_str-buffer-dynamically.patch