Commit b5665100 authored by Yury Norov's avatar Yury Norov Committed by Thomas Gleixner
Browse files

cpumask: Add initialiser to use cleanup helpers 



Now we can simplify a code that allocates cpumasks for local needs.

Automatic variables have to be initialized at declaration, or at least
before any possibility for the logic to return, so that compiler
wouldn't try to call an associate destructor function on a random stack
number.

Because cpumask_var_t, depending on the CPUMASK_OFFSTACK config, is
either a pointer or an array, we have to have a macro for initialization.

So define a CPUMASK_VAR_NULL macro, which allows to init struct cpumask
pointer with NULL when CPUMASK_OFFSTACK is enabled, and effectively a
no-op when CPUMASK_OFFSTACK is disabled (initialisation optimised out
with -O2).

Signed-off-by: default avatarYury Norov <yury.norov@gmail.com>
Signed-off-by: default avatarGabriele Monaco <gmonaco@redhat.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Reviewed-by: default avatarFrederic Weisbecker <frederic@kernel.org>
Link: https://patch.msgid.link/20251120145653.296659-7-gmonaco@redhat.com
parent 185bccc7

include/linux/cpumask.h

+2 −0
Original line number Diff line number Diff line
@@ -1005,6 +1005,7 @@ static __always_inline unsigned int cpumask_size(void) 


#define this_cpu_cpumask_var_ptr(x)	this_cpu_read(x)

#define __cpumask_var_read_mostly	__read_mostly

#define CPUMASK_VAR_NULL		NULL



bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
@@ -1051,6 +1052,7 @@ static __always_inline bool cpumask_available(cpumask_var_t mask) 


#define this_cpu_cpumask_var_ptr(x) this_cpu_ptr(x)

#define __cpumask_var_read_mostly

#define CPUMASK_VAR_NULL {}



static __always_inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)

{