+ errh-add-err_ptr_pcpu-ptr_err_pcpu-and-is_err_pcpu-macros.patch added to mm-nonmm-unstable branch

+ errh-add-err_ptr_pcpu-ptr_err_pcpu-and-is_err_pcpu-macros.patch added to mm-nonmm-unstable branch

[Andrew Morton]

The patch titled
     Subject: err.h: add ERR_PTR_PCPU(), PTR_ERR_PCPU() and IS_ERR_PCPU() macros
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     errh-add-err_ptr_pcpu-ptr_err_pcpu-and-is_err_pcpu-macros.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/errh-add-err_ptr_pcpu-ptr_err_pcpu-and-is_err_pcpu-macros.patch

This patch will later appear in the mm-nonmm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Uros Bizjak <ubizjak@gmail.com>
Subject: err.h: add ERR_PTR_PCPU(), PTR_ERR_PCPU() and IS_ERR_PCPU() macros
Date: Sun, 18 Aug 2024 23:01:51 +0200

Add ERR_PTR_PCPU(), PTR_ERR_PCPU() and IS_ERR_PCPU() macros that operate
on pointers in the percpu address space.

These macros remove the need for (__force void *) function argument casts
(to avoid sparse -Wcast-from-as warnings).

The patch will also avoid future build errors due to pointer address space
mismatch with enabled strict percpu address space checks.

Link: https://lkml.kernel.org/r/20240818210235.33481-1-ubizjak@gmail.com
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/err.h |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/include/linux/err.h~errh-add-err_ptr_pcpu-ptr_err_pcpu-and-is_err_pcpu-macros
+++ a/include/linux/err.h
@@ -41,6 +41,9 @@ static inline void * __must_check ERR_PT
 	return (void *) error;
 }
 
+/* Return the pointer in the percpu address space. */
+#define ERR_PTR_PCPU(error) ((void __percpu *)(unsigned long)ERR_PTR(error))
+
 /**
  * PTR_ERR - Extract the error code from an error pointer.
  * @ptr: An error pointer.
@@ -51,6 +54,9 @@ static inline long __must_check PTR_ERR(
 	return (long) ptr;
 }
 
+/* Read an error pointer from the percpu address space. */
+#define PTR_ERR_PCPU(ptr) (PTR_ERR((const void *)(__force const unsigned long)(ptr)))
+
 /**
  * IS_ERR - Detect an error pointer.
  * @ptr: The pointer to check.
@@ -61,6 +67,9 @@ static inline bool __must_check IS_ERR(_
 	return IS_ERR_VALUE((unsigned long)ptr);
 }
 
+/* Read an error pointer from the percpu address space. */
+#define IS_ERR_PCPU(ptr) (IS_ERR((const void *)(__force const unsigned long)(ptr)))
+
 /**
  * IS_ERR_OR_NULL - Detect an error pointer or a null pointer.
  * @ptr: The pointer to check.
_

Patches currently in -mm which might be from ubizjak@gmail.com are

mm-z3fold-add-__percpu-annotation-to-unbuddied-pointer-in-struct-z3fold_pool.patch
kexec-use-atomic_try_cmpxchg_acquire-in-kexec_trylock.patch
lib-percpu_counter-add-missing-__percpu-qualifier-to-a-cast.patch
errh-add-err_ptr_pcpu-ptr_err_pcpu-and-is_err_pcpu-macros.patch
mm-kmemleak-use-is_err_pcpu-for-pointer-in-the-percpu-address-space.patch