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>
29 lines
784 B
C
29 lines
784 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* rwsem.h: R/W semaphores, public interface
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*
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* Written by David Howells (dhowells@redhat.com).
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* Derived from asm-i386/semaphore.h
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*
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* Stub definitions for Linux kernel read-write semaphores.
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* U-Boot is single-threaded, no locking needed.
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*/
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#ifndef _LINUX_RWSEM_H
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#define _LINUX_RWSEM_H
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struct rw_semaphore {
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int count;
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};
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#define DECLARE_RWSEM(name) struct rw_semaphore name = { 0 }
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#define init_rwsem(sem) do { } while (0)
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#define down_read(sem) do { } while (0)
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#define down_read_trylock(sem) 1
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#define up_read(sem) do { } while (0)
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#define down_write(sem) do { } while (0)
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#define down_write_trylock(sem) 1
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#define up_write(sem) do { } while (0)
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#define downgrade_write(sem) do { } while (0)
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#endif /* _LINUX_RWSEM_H */
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