Commit 6cea5ae7 authored by Uros Bizjak's avatar Uros Bizjak Committed by Andrew Morton
Browse files

percpu: repurpose __percpu tag as a named address space qualifier 

The patch introduces __percpu_qual define and repurposes __percpu tag as a
named address space qualifier using the new define.

Arches can now conditionally define __percpu_qual as their named address
space qualifier for percpu variables.

Link: https://lkml.kernel.org/r/20250127160709.80604-6-ubizjak@gmail.com


Signed-off-by: default avatarUros Bizjak <ubizjak@gmail.com>
Acked-by: default avatarNadav Amit <nadav.amit@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Waiman Long <longman@redhat.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 6a39fe05

include/asm-generic/percpu.h

+13 −0
Original line number Diff line number Diff line
@@ -6,6 +6,19 @@ 
#include <linux/threads.h>

#include <linux/percpu-defs.h>



/*

 * __percpu_qual is the qualifier for the percpu named address space.

 *

 * Most arches use generic named address space for percpu variables but

 * some arches define percpu variables in different named address space

 * (on the x86 arch, percpu variable may be declared as being relative

 * to the %fs or %gs segments using __seg_fs or __seg_gs named address

 * space qualifier).

 */

#ifndef __percpu_qual

# define __percpu_qual

#endif



#ifdef CONFIG_SMP



/*

include/linux/compiler_types.h

+1 −1
Original line number Diff line number Diff line
@@ -57,7 +57,7 @@ static inline void __chk_io_ptr(const volatile void __iomem *ptr) { } 
#  define __user	BTF_TYPE_TAG(user)

# endif

# define __iomem

# define __percpu	BTF_TYPE_TAG(percpu)

# define __percpu	__percpu_qual BTF_TYPE_TAG(percpu)

# define __rcu		BTF_TYPE_TAG(rcu)



# define __chk_user_ptr(x)	(void)0