Re: [PATCH 58/60] microblaze_v4: sys_microblaze.c

[Arnd Bergmann]

On Thursday 26 June 2008, [EMAIL PROTECTED] wrote:
> +
> +/*
> + * sys_ipc() is the de-multiplexer for the SysV IPC calls..
> + *
> + * This is really horribly ugly.
> + */

If it's so horribly ugly, don't do it this way ;-)

> +int
> +sys_ipc(uint call, int first, int second, int third, void *ptr, long fifth)
> +{
> +     int version, ret;
> +
> +     version = call >> 16; /* hack for backward compatibility */
> +     call &= 0xffff;

Backwards compatibility with what?


> +static inline unsigned long
> +do_mmap2(unsigned long addr, size_t len,
> +     unsigned long prot, unsigned long flags,
> +     unsigned long fd, unsigned long pgoff)
> +{
> +     struct file *file = NULL;
> +     int ret = -EBADF;
> +
> +     flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
> +     if (!(flags & MAP_ANONYMOUS))
> +             if (!(file = fget(fd))) {
> +                     printk(KERN_INFO "no fd in mmap\r\n");
> +                     goto out;
> +             }
> +
> +     down_write(&current->mm->mmap_sem);
> +     ret = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
> +     up_write(&current->mm->mmap_sem);
> +     if (file)
> +             fput(file);
> +out:
> +     return ret;
> +}
> +
> +unsigned long sys_mmap2(unsigned long addr, size_t len,
> +                     unsigned long prot, unsigned long flags,
> +                     unsigned long fd, unsigned long pgoff)
> +{
> +     return do_mmap2(addr, len, prot, flags, fd, pgoff);
> +}
> +
> +unsigned long sys_mmap(unsigned long addr, size_t len,
> +                     unsigned long prot, unsigned long flags,
> +                     unsigned long fd, off_t offset)
> +{
> +     int err = -EINVAL;
> +
> +     if (offset & ~PAGE_MASK) {
> +             printk(KERN_INFO "no pagemask in mmap\r\n");
> +             goto out;
> +     }
> +
> +     err = do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
> +out:
> +     return err;
> +}

Which mmap is uClibc really using? I suppose you only need mmap2, even for
compatibility with any binary ever built for microblaze.

        Arnd <><
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