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percpu: repurpose __percpu tag as a named address space qualifier

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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/20241208204708.3742696-6-ubizjak@gmail.com
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Acked-by: Nadav Amit <nadav.amit@gmail.com>
Acked-by: Dennis Zhou <dennis@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
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: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Uros Bizjak 2024-12-08 21:45:20 +01:00 committed by Andrew Morton
parent d896334b8e
commit 7208ab5191
2 changed files with 14 additions and 1 deletions
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13
include/asm-generic/percpu.h
View File

@ -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
/*

2
include/linux/compiler_types.h
View File

@ -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