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vdso: Introduce vdso/cache.h 

The vDSO implementation can only include headers from the vdso/
namespace. To enable the usage of ____cacheline_aligned from
the vDSO, move it and its dependencies into a new header vdso/cache.h.
Keep compatibility by including vdso/cache.h from linux/cache.h.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250303-vdso-clock-v1-1-c1b5c69a166f@linutronix.de
This commit is contained in:
Thomas Weißschuh 2025-03-03 12:11:03 +01:00 committed by Thomas Gleixner
parent 8770a9183f
commit 0704bf4396
2 changed files with 16 additions and 8 deletions
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9
include/linux/cache.h
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@ -3,16 +3,13 @@
#define __LINUX_CACHE_H
#include <uapi/linux/kernel.h>
#include <vdso/cache.h>
#include <asm/cache.h>
#ifndef L1_CACHE_ALIGN
#define L1_CACHE_ALIGN(x) __ALIGN_KERNEL(x, L1_CACHE_BYTES)
#endif
#ifndef SMP_CACHE_BYTES
#define SMP_CACHE_BYTES L1_CACHE_BYTES
#endif
/**
* SMP_CACHE_ALIGN - align a value to the L2 cacheline size
* @x: value to align
@ -63,10 +60,6 @@
#define __ro_after_init __section(".data..ro_after_init")
#endif
#ifndef ____cacheline_aligned
#define ____cacheline_aligned __attribute__((__aligned__(SMP_CACHE_BYTES)))
#endif
#ifndef ____cacheline_aligned_in_smp
#ifdef CONFIG_SMP
#define ____cacheline_aligned_in_smp ____cacheline_aligned

15
include/vdso/cache.h Normal file
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@ -0,0 +1,15 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __VDSO_CACHE_H
#define __VDSO_CACHE_H
#include <asm/cache.h>
#ifndef SMP_CACHE_BYTES
#define SMP_CACHE_BYTES L1_CACHE_BYTES
#endif
#ifndef ____cacheline_aligned
#define ____cacheline_aligned __attribute__((__aligned__(SMP_CACHE_BYTES)))
#endif
#endif /* __VDSO_ALIGN_H */