This is a note to let you know that I've just added the patch titled
cpumask: Add helper cpumask_available()
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
cpumask-add-helper-cpumask_available.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f7e30f01a9e221067bb4b579e3cfc25cd2617467 Mon Sep 17 00:00:00 2001
From: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
Date: Wed, 12 Apr 2017 11:20:29 -0700
Subject: cpumask: Add helper cpumask_available()
From: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
commit f7e30f01a9e221067bb4b579e3cfc25cd2617467 upstream.
With CONFIG_CPUMASK_OFFSTACK=y cpumask_var_t is a struct cpumask
pointer, otherwise a struct cpumask array with a single element.
Some code dealing with cpumasks needs to validate that a cpumask_var_t
is not a NULL pointer when CONFIG_CPUMASK_OFFSTACK=y. This is typically
done by performing the check always, regardless of the underlying type
of cpumask_var_t. This works in both cases, however clang raises a
warning like this when CONFIG_CPUMASK_OFFSTACK=n:
kernel/irq/manage.c:839:28: error: address of array
'desc->irq_common_data.affinity' will always evaluate to 'true'
[-Werror,-Wpointer-bool-conversion]
Add the inline helper cpumask_available() which only performs the
pointer check if CONFIG_CPUMASK_OFFSTACK=y.
Signed-off-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
Cc: Grant Grundler <grundler@xxxxxxxxxxxx>
Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Cc: Greg Hackmann <ghackmann@xxxxxxxxxx>
Cc: Michael Davidson <md@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20170412182030.83657-1-mka@xxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Nathan Chancellor <natechancellor@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
include/linux/cpumask.h | 10 ++++++++++
1 file changed, 10 insertions(+)
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -661,6 +661,11 @@ void alloc_bootmem_cpumask_var(cpumask_v
void free_cpumask_var(cpumask_var_t mask);
void free_bootmem_cpumask_var(cpumask_var_t mask);
+static inline bool cpumask_available(cpumask_var_t mask)
+{
+ return mask != NULL;
+}
+
#else
typedef struct cpumask cpumask_var_t[1];
@@ -701,6 +706,11 @@ static inline void free_cpumask_var(cpum
static inline void free_bootmem_cpumask_var(cpumask_var_t mask)
{
}
+
+static inline bool cpumask_available(cpumask_var_t mask)
+{
+ return true;
+}
#endif /* CONFIG_CPUMASK_OFFSTACK */
/* It's common to want to use cpu_all_mask in struct member initializers,
Patches currently in stable-queue which might be from mka@xxxxxxxxxxxx are
queue-4.4/dm-ioctl-remove-double-parentheses.patch
queue-4.4/genirq-use-cpumask_available-for-check-of-cpumask-variable.patch
queue-4.4/fs-compat-remove-warning-from-compatible_ioctl.patch
queue-4.4/selinux-remove-unnecessary-check-of-array-base-in-selinux_set_mapping.patch
queue-4.4/pci-make-pci_rom_address_mask-a-32-bit-constant.patch
queue-4.4/cpumask-add-helper-cpumask_available.patch