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percpu: cast percpu pointer in PERCPU_PTR() via unsigned long

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Cast pointer from percpu address space to generic (kernel) address space
in PERCPU_PTR() macro via unsigned long intermediate cast [1].  This
intermediate cast is also required to avoid build failure when GCC's
strict named address space checks for x86 targets [2] are enabled.

Found by GCC's named address space checks.

[1] https://sparse.docs.kernel.org/en/latest/annotations.html#address-space-name
[2] https://gcc.gnu.org/onlinedocs/gcc/Named-Address-Spaces.html#x86-Named-Address-Spaces

Link: https://lkml.kernel.org/r/20241021080856.48746-3-ubizjak@gmail.com
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Uros Bizjak 2024-10-21 10:07:38 +02:00 committed by Andrew Morton
parent 001217defd
commit dabddd687c
1 changed files with 4 additions and 1 deletions
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5
include/linux/percpu-defs.h
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@ -221,7 +221,10 @@ do { \
} while (0)
#define PERCPU_PTR(__p) \
(typeof(*(__p)) __force __kernel *)(__p);
({ \
unsigned long __pcpu_ptr = (__force unsigned long)(__p); \
(typeof(*(__p)) __force __kernel *)(__pcpu_ptr); \
})
#ifdef CONFIG_SMP