asmlinkage int sys_cacheflush()

in kernel/sys_sh.c [58:96]

• 29 lines of code
• 10 McCabe index (conditional complexity)

asmlinkage int sys_cacheflush(unsigned long addr, unsigned long len, int op)
{
	struct vm_area_struct *vma;

	if ((op <= 0) || (op > (CACHEFLUSH_D_PURGE|CACHEFLUSH_I)))
		return -EINVAL;

	/*
	 * Verify that the specified address region actually belongs
	 * to this process.
	 */
	if (addr + len < addr)
		return -EFAULT;

	mmap_read_lock(current->mm);
	vma = find_vma (current->mm, addr);
	if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end) {
		mmap_read_unlock(current->mm);
		return -EFAULT;
	}

	switch (op & CACHEFLUSH_D_PURGE) {
		case CACHEFLUSH_D_INVAL:
			__flush_invalidate_region((void *)addr, len);
			break;
		case CACHEFLUSH_D_WB:
			__flush_wback_region((void *)addr, len);
			break;
		case CACHEFLUSH_D_PURGE:
			__flush_purge_region((void *)addr, len);
			break;
	}

	if (op & CACHEFLUSH_I)
		flush_icache_range(addr, addr+len);

	mmap_read_unlock(current->mm);
	return 0;
}