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>
57 lines
982 B
C
57 lines
982 B
C
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#include <malloc.h>
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#include <memalign.h>
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#include <string.h>
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#include <asm/cache.h>
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#include <linux/compat.h>
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struct task_struct cur = {
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.pid = 1,
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};
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__maybe_unused struct task_struct *current = &cur;
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void *kmalloc(size_t size, gfp_t flags)
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{
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void *p;
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p = malloc_cache_aligned(size);
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if (p && flags & __GFP_ZERO)
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memset(p, 0, size);
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return p;
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}
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struct kmem_cache *get_mem(int element_sz)
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{
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struct kmem_cache *ret;
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ret = memalign(ARCH_DMA_MINALIGN, sizeof(struct kmem_cache));
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ret->sz = element_sz;
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return ret;
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}
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void *kmem_cache_alloc(struct kmem_cache *obj, gfp_t flag)
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{
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return malloc_cache_aligned(obj->sz);
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}
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/**
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* kmemdup - duplicate region of memory
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*
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* @src: memory region to duplicate
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* @len: memory region length
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* @gfp: GFP mask to use
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*
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* Return: newly allocated copy of @src or %NULL in case of error
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*/
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void *kmemdup(const void *src, size_t len, gfp_t gfp)
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{
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void *p;
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p = kmalloc(len, gfp);
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if (p)
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memcpy(p, src, len);
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return p;
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}
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