https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: a430d95c5efa2b545d26a094eb5f624e36732af0 authored by Linus Torvalds on 16 September 2024, 16:19:47 UTC
Merge tag 'lsm-pr-20240911' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm
Merge tag 'lsm-pr-20240911' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm
Tip revision: a430d95
mmiowb.h
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_GENERIC_MMIOWB_H
#define __ASM_GENERIC_MMIOWB_H
/*
* Generic implementation of mmiowb() tracking for spinlocks.
*
* If your architecture doesn't ensure that writes to an I/O peripheral
* within two spinlocked sections on two different CPUs are seen by the
* peripheral in the order corresponding to the lock handover, then you
* need to follow these FIVE easy steps:
*
* 1. Implement mmiowb() (and arch_mmiowb_state() if you're fancy)
* in asm/mmiowb.h, then #include this file
* 2. Ensure your I/O write accessors call mmiowb_set_pending()
* 3. Select ARCH_HAS_MMIOWB
* 4. Untangle the resulting mess of header files
* 5. Complain to your architects
*/
#ifdef CONFIG_MMIOWB
#include <linux/compiler.h>
#include <asm-generic/mmiowb_types.h>
#ifndef arch_mmiowb_state
#include <asm/percpu.h>
#include <asm/smp.h>
DECLARE_PER_CPU(struct mmiowb_state, __mmiowb_state);
#define __mmiowb_state() raw_cpu_ptr(&__mmiowb_state)
#else
#define __mmiowb_state() arch_mmiowb_state()
#endif /* arch_mmiowb_state */
static inline void mmiowb_set_pending(void)
{
struct mmiowb_state *ms = __mmiowb_state();
if (likely(ms->nesting_count))
ms->mmiowb_pending = ms->nesting_count;
}
static inline void mmiowb_spin_lock(void)
{
struct mmiowb_state *ms = __mmiowb_state();
ms->nesting_count++;
}
static inline void mmiowb_spin_unlock(void)
{
struct mmiowb_state *ms = __mmiowb_state();
if (unlikely(ms->mmiowb_pending)) {
ms->mmiowb_pending = 0;
mmiowb();
}
ms->nesting_count--;
}
#else
#define mmiowb_set_pending() do { } while (0)
#define mmiowb_spin_lock() do { } while (0)
#define mmiowb_spin_unlock() do { } while (0)
#endif /* CONFIG_MMIOWB */
#endif /* __ASM_GENERIC_MMIOWB_H */