The patch titled
Subject: percpu: use TYPEOF_UNQUAL() in *_cpu_ptr() accessors
has been added to the -mm mm-unstable branch. Its filename is
percpu-use-typeof_unqual-in-_cpu_ptr-accessors.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/percpu-use-typeof_unqual-in-_cpu_ptr-accessors.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: Uros Bizjak <ubizjak@xxxxxxxxx>
Subject: percpu: use TYPEOF_UNQUAL() in *_cpu_ptr() accessors
Date: Sun, 8 Dec 2024 21:45:19 +0100
Use TYPEOF_UNQUAL() macro to declare the return type of *_cpu_ptr()
accessors in the generic named address space to avoid access to data from
pointer to non-enclosed address space type of errors.
Link: https://lkml.kernel.org/r/20241208204708.3742696-5-ubizjak@xxxxxxxxx
Signed-off-by: Uros Bizjak <ubizjak@xxxxxxxxx>
Acked-by: Nadav Amit <nadav.amit@xxxxxxxxx>
Acked-by: Christoph Lameter <cl@xxxxxxxxx>
Acked-by: Dennis Zhou <dennis@xxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Brian Gerst <brgerst@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Boqun Feng <boqun.feng@xxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Denys Vlasenko <dvlasenk@xxxxxxxxxx>
Cc: Eric Dumazet <edumazet@xxxxxxxxxx>
Cc: Jakub Kicinski <kuba@xxxxxxxxxx>
Cc: Kent Overstreet <kent.overstreet@xxxxxxxxx>
Cc: Paolo Abeni <pabeni@xxxxxxxxxx>
Cc: Waiman Long <longman@xxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/include/asm/percpu.h | 8 ++++++--
include/linux/percpu-defs.h | 2 +-
2 files changed, 7 insertions(+), 3 deletions(-)
--- a/arch/x86/include/asm/percpu.h~percpu-use-typeof_unqual-in-_cpu_ptr-accessors
+++ a/arch/x86/include/asm/percpu.h
@@ -73,10 +73,14 @@
unsigned long tcp_ptr__ = raw_cpu_read_long(this_cpu_off); \
\
tcp_ptr__ += (__force unsigned long)(_ptr); \
- (typeof(*(_ptr)) __kernel __force *)tcp_ptr__; \
+ (TYPEOF_UNQUAL(*(_ptr)) __force __kernel *)tcp_ptr__; \
})
#else
-#define arch_raw_cpu_ptr(_ptr) ({ BUILD_BUG(); (typeof(_ptr))0; })
+#define arch_raw_cpu_ptr(_ptr) \
+({ \
+ BUILD_BUG(); \
+ (TYPEOF_UNQUAL(*(_ptr)) __force __kernel *)0; \
+})
#endif
#define PER_CPU_VAR(var) %__percpu_seg:(var)__percpu_rel
--- a/include/linux/percpu-defs.h~percpu-use-typeof_unqual-in-_cpu_ptr-accessors
+++ a/include/linux/percpu-defs.h
@@ -223,7 +223,7 @@ do { \
#define PERCPU_PTR(__p) \
({ \
unsigned long __pcpu_ptr = (__force unsigned long)(__p); \
- (typeof(*(__p)) __force __kernel *)(__pcpu_ptr); \
+ (TYPEOF_UNQUAL(*(__p)) __force __kernel *)(__pcpu_ptr); \
})
#ifdef CONFIG_SMP
_
Patches currently in -mm which might be from ubizjak@xxxxxxxxx are
x86-kgdb-use-is_err_pcpu-macro.patch
compilerh-introduce-typeof_unqual-macro.patch
percpu-use-typeof_unqual-in-variable-declarations.patch
percpu-use-typeof_unqual-in-_cpu_ptr-accessors.patch
percpu-repurpose-__percpu-tag-as-a-named-address-space-qualifier.patch
percpu-x86-enable-strict-percpu-checks-via-named-as-qualifiers.patch
