5029b8c91b
Add stub headers for various Linux kernel interfaces that ext4 code expects: - sched.h: scheduler stubs (task_struct, cond_resched, yield) - wait.h: wait queue stubs - rwsem.h: read-write semaphore stubs - percpu_counter.h: percpu counter implementation (single-threaded) - random.h: random number stubs - quotaops.h: disk quota operation stubs - part_stat.h: partition statistics stubs - prefetch.h: prefetch operation stubs - sort.h: sort wrapper using stdlib qsort - swap.h: swap/memory management stubs Update compat.h to include new headers and remove duplicate definitions. Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com> Signed-off-by: Simon Glass <simon.glass@canonical.com> Series-to: concept Cover-letter: ext4l: Add Linux compatibility headers This series extracts Linux kernel compatibility declarations from include/linux/compat.h into their own header files, matching the Linux kernel's organization. This makes it easier to port Linux filesystem code to U-Boot and keeps the compatibility layer maintainable. The headers come from Linux v6.18 Headers added: - export.h: EXPORT_SYMBOL macros - stddef.h: sizeof_field() macro - uaccess.h: copy_to/from_user stubs - capability.h, cred.h, file.h, path.h, security.h, seq_file.h - freezer.h: process freezer stubs - slab.h, vmalloc.h: memory allocation - module.h: kernel module stubs - init.h: initcall macros - kthread.h: kernel thread stubs - timer.h, workqueue.h: timer and workqueue stubs - sched.h, wait.h, rwsem.h: scheduler and synchronization - percpu_counter.h, random.h, quotaops.h, part_stat.h, prefetch.h, sort.h, swap.h All headers include appropriate copyright/author information from the original Linux sources. END Series-links: 1:77 Series-version: 2 Signed-off-by: Simon Glass <simon.glass@canonical.com>
81 lines
1.6 KiB
C
81 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* A simple "approximate counter" for use in ext2 and ext3 superblocks.
|
|
*
|
|
* WARNING: these things are HUGE. 4 kbytes per counter on 32-way P4.
|
|
*
|
|
* Stub definitions for percpu counters.
|
|
* U-Boot is single-threaded, use simple counters.
|
|
*/
|
|
#ifndef _LINUX_PERCPU_COUNTER_H
|
|
#define _LINUX_PERCPU_COUNTER_H
|
|
|
|
#include <linux/types.h>
|
|
|
|
struct percpu_counter {
|
|
s64 count;
|
|
};
|
|
|
|
static inline int percpu_counter_init(struct percpu_counter *fbc, s64 amount,
|
|
gfp_t gfp)
|
|
{
|
|
fbc->count = amount;
|
|
return 0;
|
|
}
|
|
|
|
static inline void percpu_counter_destroy(struct percpu_counter *fbc)
|
|
{
|
|
}
|
|
|
|
static inline void percpu_counter_set(struct percpu_counter *fbc, s64 amount)
|
|
{
|
|
fbc->count = amount;
|
|
}
|
|
|
|
static inline void percpu_counter_add(struct percpu_counter *fbc, s64 amount)
|
|
{
|
|
fbc->count += amount;
|
|
}
|
|
|
|
static inline void percpu_counter_sub(struct percpu_counter *fbc, s64 amount)
|
|
{
|
|
fbc->count -= amount;
|
|
}
|
|
|
|
static inline void percpu_counter_inc(struct percpu_counter *fbc)
|
|
{
|
|
fbc->count++;
|
|
}
|
|
|
|
static inline void percpu_counter_dec(struct percpu_counter *fbc)
|
|
{
|
|
fbc->count--;
|
|
}
|
|
|
|
static inline s64 percpu_counter_read(struct percpu_counter *fbc)
|
|
{
|
|
return fbc->count;
|
|
}
|
|
|
|
static inline s64 percpu_counter_read_positive(struct percpu_counter *fbc)
|
|
{
|
|
return fbc->count > 0 ? fbc->count : 0;
|
|
}
|
|
|
|
static inline s64 percpu_counter_sum(struct percpu_counter *fbc)
|
|
{
|
|
return fbc->count;
|
|
}
|
|
|
|
static inline s64 percpu_counter_sum_positive(struct percpu_counter *fbc)
|
|
{
|
|
return fbc->count > 0 ? fbc->count : 0;
|
|
}
|
|
|
|
static inline bool percpu_counter_initialized(struct percpu_counter *fbc)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
#endif /* _LINUX_PERCPU_COUNTER_H */
|