cregit-Linux how code gets into the kernel

Release 4.17 include/acpi/platform/aclinuxex.h

/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 */
/******************************************************************************
 *
 * Name: aclinuxex.h - Extra OS specific defines, etc. for Linux
 *
 * Copyright (C) 2000 - 2018, Intel Corp.
 *
 *****************************************************************************/

#ifndef __ACLINUXEX_H__

#define __ACLINUXEX_H__

#ifdef __KERNEL__

#ifndef ACPI_USE_NATIVE_DIVIDE

#ifndef ACPI_DIV_64_BY_32

#define ACPI_DIV_64_BY_32(n_hi, n_lo, d32, q32, r32) \
	do { \
                u64 (__n) = ((u64) n_hi) << 32 | (n_lo); \
                (r32) = do_div ((__n), (d32)); \
                (q32) = (u32) (__n); \
        } while (0)
#endif

#ifndef ACPI_SHIFT_RIGHT_64

#define ACPI_SHIFT_RIGHT_64(n_hi, n_lo) \
	do { \
                (n_lo) >>= 1; \
                (n_lo) |= (((n_hi) & 1) << 31); \
                (n_hi) >>= 1; \
        } while (0)
#endif

#endif

/*
 * Overrides for in-kernel ACPICA
 */
acpi_status ACPI_INIT_FUNCTION acpi_os_initialize(void);

acpi_status acpi_os_terminate(void);

/*
 * The irqs_disabled() check is for resume from RAM.
 * Interrupts are off during resume, just like they are for boot.
 * However, boot has  (system_state != SYSTEM_RUNNING)
 * to quiet __might_sleep() in kmalloc() and resume does not.
 */

static inline void *acpi_os_allocate(acpi_size size) { return kmalloc(size, irqs_disabled()? GFP_ATOMIC : GFP_KERNEL); }

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static inline void *acpi_os_allocate_zeroed(acpi_size size) { return kzalloc(size, irqs_disabled()? GFP_ATOMIC : GFP_KERNEL); }

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static inline void acpi_os_free(void *memory) { kfree(memory); }

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static inline void *acpi_os_acquire_object(acpi_cache_t * cache) { return kmem_cache_zalloc(cache, irqs_disabled()? GFP_ATOMIC : GFP_KERNEL); }

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static inline acpi_thread_id acpi_os_get_thread_id(void) { return (acpi_thread_id) (unsigned long)current; }

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/* * When lockdep is enabled, the spin_lock_init() macro stringifies it's * argument and uses that as a name for the lock in debugging. * By executing spin_lock_init() in a macro the key changes from "lock" for * all locks to the name of the argument of acpi_os_create_lock(), which * prevents lockdep from reporting false positives for ACPICA locks. */ #define acpi_os_create_lock(__handle) \ ({ \ spinlock_t *lock = ACPI_ALLOCATE(sizeof(*lock)); \ if (lock) { \ *(__handle) = lock; \ spin_lock_init(*(__handle)); \ } \ lock ? AE_OK : AE_NO_MEMORY; \ })
static inline u8 acpi_os_readable(void *pointer, acpi_size length) { return TRUE; }

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static inline acpi_status acpi_os_initialize_debugger(void) { return AE_OK; }

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static inline void acpi_os_terminate_debugger(void) { return; }

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/* * OSL interfaces added by Linux */ #endif /* __KERNEL__ */ #endif /* __ACLINUXEX_H__ */

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