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Re: [Xen-devel] [PATCH v3 02/10] xen: reduce number of global variables in xen loader



On Fri, Feb 19, 2016 at 05:59:27AM +0100, Juergen Gross wrote:
> On 18/02/16 18:00, Lennart Sorensen wrote:
> > On Thu, Feb 18, 2016 at 11:34:49AM +0100, Juergen Gross wrote:
> >> On 18/02/16 11:22, Daniel Kiper wrote:
> >>> On Wed, Feb 17, 2016 at 06:19:29PM +0100, Juergen Gross wrote:
> >>>> The loader for xen paravirtualized environment is using lots of global
> >>>> variables. Reduce the number by making them either local or by putting
> >>>> them into a single state structure.
> >>>>
> >>>> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
> >>>
> >>> Just two nitpicks but in general...
> >>>
> >>> Reviewed-by: Daniel Kiper <daniel.kiper@xxxxxxxxxx>
> >>>
> >>>> ---
> >>>>  grub-core/loader/i386/xen.c | 259 
> >>>> +++++++++++++++++++++++---------------------
> >>>>  1 file changed, 138 insertions(+), 121 deletions(-)
> >>>>
> >>>> diff --git a/grub-core/loader/i386/xen.c b/grub-core/loader/i386/xen.c
> >>>> index ff7c553..d5fe168 100644
> >>>> --- a/grub-core/loader/i386/xen.c
> >>>> +++ b/grub-core/loader/i386/xen.c
> >>>> @@ -42,16 +42,20 @@
> >>>>
> >>>>  GRUB_MOD_LICENSE ("GPLv3+");
> >>>>
> >>>> -static struct grub_relocator *relocator = NULL;
> >>>> -static grub_uint64_t max_addr;
> >>>> +struct xen_loader_state {
> >>>> +  struct grub_relocator *relocator;
> >>>> +  struct start_info next_start;
> >>>> +  struct grub_xen_file_info xen_inf;
> >>>> +  grub_uint64_t max_addr;
> >>>> +  struct xen_multiboot_mod_list *module_info_page;
> >>>> +  grub_uint64_t modules_target_start;
> >>>> +  grub_size_t n_modules;
> >>>> +  int loaded;
> >>>> +};
> >>>> +
> >>>> +static struct xen_loader_state xen_state;
> >>>> +
> >>>>  static grub_dl_t my_mod;
> >>>> -static int loaded = 0;
> >>>> -static struct start_info next_start;
> >>>> -static void *kern_chunk_src;
> >>>> -static struct grub_xen_file_info xen_inf;
> >>>> -static struct xen_multiboot_mod_list *xen_module_info_page;
> >>>> -static grub_uint64_t modules_target_start;
> >>>> -static grub_size_t n_modules;
> >>>>
> >>>>  #define PAGE_SIZE 4096
> >>>>  #define MAX_MODULES (PAGE_SIZE / sizeof (struct xen_multiboot_mod_list))
> >>>> @@ -225,50 +229,55 @@ grub_xen_boot (void)
> >>>>    if (grub_xen_n_allocated_shared_pages)
> >>>>      return grub_error (GRUB_ERR_BUG, "active grants");
> >>>>
> >>>> -  state.mfn_list = max_addr;
> >>>> -  next_start.mfn_list = max_addr + xen_inf.virt_base;
> >>>> -  next_start.first_p2m_pfn = max_addr >> PAGE_SHIFT;    /* Is this 
> >>>> right? */
> >>>> +  state.mfn_list = xen_state.max_addr;
> >>>> +  xen_state.next_start.mfn_list =
> >>>> +    xen_state.max_addr + xen_state.xen_inf.virt_base;
> >>>> +  xen_state.next_start.first_p2m_pfn = xen_state.max_addr >> PAGE_SHIFT;
> >>>>    pgtsize = sizeof (grub_xen_mfn_t) * 
> >>>> grub_xen_start_page_addr->nr_pages;
> >>>> -  err = grub_relocator_alloc_chunk_addr (relocator, &ch, max_addr, 
> >>>> pgtsize);
> >>>> -  next_start.nr_p2m_frames = (pgtsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
> >>>> +  err = grub_relocator_alloc_chunk_addr (xen_state.relocator, &ch,
> >>>> +                                         xen_state.max_addr, pgtsize);
> >>>> +  xen_state.next_start.nr_p2m_frames = (pgtsize + PAGE_SIZE - 1) >> 
> >>>> PAGE_SHIFT;
> >>>>    if (err)
> >>>>      return err;
> >>>>    new_mfn_list = get_virtual_current_address (ch);
> >>>>    grub_memcpy (new_mfn_list,
> >>>>                 (void *) grub_xen_start_page_addr->mfn_list, pgtsize);
> >>>> -  max_addr = ALIGN_UP (max_addr + pgtsize, PAGE_SIZE);
> >>>> +  xen_state.max_addr = ALIGN_UP (xen_state.max_addr + pgtsize, 
> >>>> PAGE_SIZE);
> >>>>
> >>>> -  err = grub_relocator_alloc_chunk_addr (relocator, &ch,
> >>>> -                                         max_addr, sizeof (next_start));
> >>>> +  err = grub_relocator_alloc_chunk_addr (xen_state.relocator, &ch,
> >>>> +                                         xen_state.max_addr,
> >>>> +                                         sizeof (xen_state.next_start));
> >>>>    if (err)
> >>>>      return err;
> >>>> -  state.start_info = max_addr + xen_inf.virt_base;
> >>>> +  state.start_info = xen_state.max_addr + xen_state.xen_inf.virt_base;
> >>>>    nst = get_virtual_current_address (ch);
> >>>> -  max_addr = ALIGN_UP (max_addr + sizeof (next_start), PAGE_SIZE);
> >>>> +  xen_state.max_addr =
> >>>> +    ALIGN_UP (xen_state.max_addr + sizeof (xen_state.next_start), 
> >>>> PAGE_SIZE);
> >>>>
> >>>> -  next_start.nr_pages = grub_xen_start_page_addr->nr_pages;
> >>>> -  grub_memcpy (next_start.magic, grub_xen_start_page_addr->magic,
> >>>> -               sizeof (next_start.magic));
> >>>> -  next_start.store_mfn = grub_xen_start_page_addr->store_mfn;
> >>>> -  next_start.store_evtchn = grub_xen_start_page_addr->store_evtchn;
> >>>> -  next_start.console.domU = grub_xen_start_page_addr->console.domU;
> >>>> -  next_start.shared_info = grub_xen_start_page_addr->shared_info;
> >>>> +  xen_state.next_start.nr_pages = grub_xen_start_page_addr->nr_pages;
> >>>> +  grub_memcpy (xen_state.next_start.magic, 
> >>>> grub_xen_start_page_addr->magic,
> >>>> +               sizeof (xen_state.next_start.magic));
> >>>> +  xen_state.next_start.store_mfn = grub_xen_start_page_addr->store_mfn;
> >>>> +  xen_state.next_start.store_evtchn = 
> >>>> grub_xen_start_page_addr->store_evtchn;
> >>>> +  xen_state.next_start.console.domU = 
> >>>> grub_xen_start_page_addr->console.domU;
> >>>> +  xen_state.next_start.shared_info = 
> >>>> grub_xen_start_page_addr->shared_info;
> >>>>
> >>>> -  err = set_mfns (new_mfn_list, max_addr >> PAGE_SHIFT);
> >>>> +  err = set_mfns (new_mfn_list, xen_state.max_addr >> PAGE_SHIFT);
> >>>>    if (err)
> >>>>      return err;
> >>>> -  max_addr += 2 * PAGE_SIZE;
> >>>> +  xen_state.max_addr += 2 * PAGE_SIZE;
> >>>>
> >>>> -  next_start.pt_base = max_addr + xen_inf.virt_base;
> >>>> -  state.paging_start = max_addr >> PAGE_SHIFT;
> >>>> +  xen_state.next_start.pt_base =
> >>>> +    xen_state.max_addr + xen_state.xen_inf.virt_base;
> >>>> +  state.paging_start = xen_state.max_addr >> PAGE_SHIFT;
> >>>>
> >>>> -  nr_info_pages = max_addr >> PAGE_SHIFT;
> >>>> +  nr_info_pages = xen_state.max_addr >> PAGE_SHIFT;
> >>>>    nr_pages = nr_info_pages;
> >>>>
> >>>>    while (1)
> >>>>      {
> >>>>        nr_pages = ALIGN_UP (nr_pages, (ALIGN_SIZE >> PAGE_SHIFT));
> >>>> -      nr_pt_pages = get_pgtable_size (nr_pages, xen_inf.virt_base);
> >>>> +      nr_pt_pages = get_pgtable_size (nr_pages, 
> >>>> xen_state.xen_inf.virt_base);
> >>>>        nr_need_pages =
> >>>>          nr_info_pages + nr_pt_pages +
> >>>>          ((ADDITIONAL_SIZE + STACK_SIZE) >> PAGE_SHIFT);
> >>>> @@ -278,27 +287,28 @@ grub_xen_boot (void)
> >>>>      }
> >>>>
> >>>>    grub_dprintf ("xen", "bootstrap domain %llx+%llx\n",
> >>>> -                (unsigned long long) xen_inf.virt_base,
> >>>> +                (unsigned long long) xen_state.xen_inf.virt_base,
> >>>>                  (unsigned long long) page2offset (nr_pages));
> >>>>
> >>>> -  err = grub_relocator_alloc_chunk_addr (relocator, &ch,
> >>>> -                                         max_addr, page2offset 
> >>>> (nr_pt_pages));
> >>>> +  err = grub_relocator_alloc_chunk_addr (xen_state.relocator, &ch,
> >>>> +                                         xen_state.max_addr,
> >>>> +                                         page2offset (nr_pt_pages));
> >>>>    if (err)
> >>>>      return err;
> >>>>
> >>>>    generate_page_table (get_virtual_current_address (ch),
> >>>> -                       max_addr >> PAGE_SHIFT, nr_pages,
> >>>> -                       xen_inf.virt_base, new_mfn_list);
> >>>> +                       xen_state.max_addr >> PAGE_SHIFT, nr_pages,
> >>>> +                       xen_state.xen_inf.virt_base, new_mfn_list);
> >>>>
> >>>> -  max_addr += page2offset (nr_pt_pages);
> >>>> -  state.stack = max_addr + STACK_SIZE + xen_inf.virt_base;
> >>>> -  state.entry_point = xen_inf.entry_point;
> >>>> +  xen_state.max_addr += page2offset (nr_pt_pages);
> >>>> +  state.stack = xen_state.max_addr + STACK_SIZE + 
> >>>> xen_state.xen_inf.virt_base;
> >>>> +  state.entry_point = xen_state.xen_inf.entry_point;
> >>>>
> >>>> -  next_start.nr_p2m_frames += nr_pt_pages;
> >>>> -  next_start.nr_pt_frames = nr_pt_pages;
> >>>> +  xen_state.next_start.nr_p2m_frames += nr_pt_pages;
> >>>> +  xen_state.next_start.nr_pt_frames = nr_pt_pages;
> >>>>    state.paging_size = nr_pt_pages;
> >>>>
> >>>> -  *nst = next_start;
> >>>> +  *nst = xen_state.next_start;
> >>>>
> >>>>    grub_memset (&gnttab_setver, 0, sizeof (gnttab_setver));
> >>>>
> >>>> @@ -308,24 +318,20 @@ grub_xen_boot (void)
> >>>>    for (i = 0; i < ARRAY_SIZE (grub_xen_shared_info->evtchn_pending); 
> >>>> i++)
> >>>>      grub_xen_shared_info->evtchn_pending[i] = 0;
> >>>>
> >>>> -  return grub_relocator_xen_boot (relocator, state, nr_pages,
> >>>> -                                  xen_inf.virt_base <
> >>>> +  return grub_relocator_xen_boot (xen_state.relocator, state, nr_pages,
> >>>> +                                  xen_state.xen_inf.virt_base <
> >>>>                                    PAGE_SIZE ? page2offset (nr_pages) : 
> >>>> 0,
> >>>>                                    nr_pages - 1,
> >>>>                                    page2offset (nr_pages - 1) +
> >>>> -                                  xen_inf.virt_base);
> >>>> +                                  xen_state.xen_inf.virt_base);
> >>>>  }
> >>>>
> >>>>  static void
> >>>>  grub_xen_reset (void)
> >>>>  {
> >>>> -  grub_memset (&next_start, 0, sizeof (next_start));
> >>>> -  xen_module_info_page = NULL;
> >>>> -  n_modules = 0;
> >>>> +  grub_relocator_unload (xen_state.relocator);
> >>>>
> >>>> -  grub_relocator_unload (relocator);
> >>>> -  relocator = NULL;
> >>>> -  loaded = 0;
> >>>> +  grub_memset (&xen_state, 0, sizeof (xen_state));
> >>>>  }
> >>>>
> >>>>  static grub_err_t
> >>>> @@ -409,17 +415,22 @@ grub_cmd_xen (grub_command_t cmd __attribute__ 
> >>>> ((unused)),
> >>>>    grub_file_t file;
> >>>>    grub_elf_t elf;
> >>>>    grub_err_t err;
> >>>> +  void *kern_chunk_src;
> >>>> +  grub_relocator_chunk_t ch;
> >>>> +  grub_addr_t kern_start;
> >>>> +  grub_addr_t kern_end;
> >>>>
> >>>>    if (argc == 0)
> >>>>      return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
> >>>>
> >>>> +  /* Call grub_loader_unset early to avoid it being called by 
> >>>> grub_loader_set */
> >>>>    grub_loader_unset ();
> >>>>
> >>>>    grub_xen_reset ();
> >>>>
> >>>>    grub_create_loader_cmdline (argc - 1, argv + 1,
> >>>> -                              (char *) next_start.cmd_line,
> >>>> -                              sizeof (next_start.cmd_line) - 1);
> >>>> +                              (char *) xen_state.next_start.cmd_line,
> >>>> +                              sizeof (xen_state.next_start.cmd_line) - 
> >>>> 1);
> >>>>
> >>>>    file = grub_file_open (argv[0]);
> >>>>    if (!file)
> >>>> @@ -429,85 +440,82 @@ grub_cmd_xen (grub_command_t cmd __attribute__ 
> >>>> ((unused)),
> >>>>    if (!elf)
> >>>>      goto fail;
> >>>>
> >>>> -  err = grub_xen_get_info (elf, &xen_inf);
> >>>> +  err = grub_xen_get_info (elf, &xen_state.xen_inf);
> >>>>    if (err)
> >>>>      goto fail;
> >>>>  #ifdef __x86_64__
> >>>> -  if (xen_inf.arch != GRUB_XEN_FILE_X86_64)
> >>>> +  if (xen_state.xen_inf.arch != GRUB_XEN_FILE_X86_64)
> >>>>  #else
> >>>> -  if (xen_inf.arch != GRUB_XEN_FILE_I386_PAE
> >>>> -      && xen_inf.arch != GRUB_XEN_FILE_I386_PAE_BIMODE)
> >>>> +  if (xen_state.xen_inf.arch != GRUB_XEN_FILE_I386_PAE
> >>>> +      && xen_state.xen_inf.arch != GRUB_XEN_FILE_I386_PAE_BIMODE)
> >>>>  #endif
> >>>>      {
> >>>>        grub_error (GRUB_ERR_BAD_OS, "incompatible architecture: %d",
> >>>> -                  xen_inf.arch);
> >>>> +                  xen_state.xen_inf.arch);
> >>>>        goto fail;
> >>>>      }
> >>>>
> >>>> -  if (xen_inf.virt_base & (PAGE_SIZE - 1))
> >>>> +  if (xen_state.xen_inf.virt_base & (PAGE_SIZE - 1))
> >>>>      {
> >>>>        grub_error (GRUB_ERR_BAD_OS, "unaligned virt_base");
> >>>>        goto fail;
> >>>>      }
> >>>>    grub_dprintf ("xen", "virt_base = %llx, entry = %llx\n",
> >>>> -                (unsigned long long) xen_inf.virt_base,
> >>>> -                (unsigned long long) xen_inf.entry_point);
> >>>> +                (unsigned long long) xen_state.xen_inf.virt_base,
> >>>> +                (unsigned long long) xen_state.xen_inf.entry_point);
> >>>>
> >>>> -  relocator = grub_relocator_new ();
> >>>> -  if (!relocator)
> >>>> +  xen_state.relocator = grub_relocator_new ();
> >>>> +  if (!xen_state.relocator)
> >>>>      goto fail;
> >>>>
> >>>> -  grub_relocator_chunk_t ch;
> >>>> -  grub_addr_t kern_start = xen_inf.kern_start - xen_inf.paddr_offset;
> >>>> -  grub_addr_t kern_end = xen_inf.kern_end - xen_inf.paddr_offset;
> >>>> +  kern_start = xen_state.xen_inf.kern_start - 
> >>>> xen_state.xen_inf.paddr_offset;
> >>>> +  kern_end = xen_state.xen_inf.kern_end - 
> >>>> xen_state.xen_inf.paddr_offset;
> >>>>
> >>>> -  if (xen_inf.has_hypercall_page)
> >>>> +  if (xen_state.xen_inf.has_hypercall_page)
> >>>>      {
> >>>>        grub_dprintf ("xen", "hypercall page at 0x%llx\n",
> >>>> -                    (unsigned long long) xen_inf.hypercall_page);
> >>>> -      if (xen_inf.hypercall_page - xen_inf.virt_base < kern_start)
> >>>> -        kern_start = xen_inf.hypercall_page - xen_inf.virt_base;
> >>>> -
> >>>> -      if (xen_inf.hypercall_page - xen_inf.virt_base + PAGE_SIZE > 
> >>>> kern_end)
> >>>> -        kern_end = xen_inf.hypercall_page - xen_inf.virt_base + 
> >>>> PAGE_SIZE;
> >>>> +                    (unsigned long long) 
> >>>> xen_state.xen_inf.hypercall_page);
> >>>> +      kern_start = grub_min (kern_start, 
> >>>> xen_state.xen_inf.hypercall_page -
> >>>> +                                         xen_state.xen_inf.virt_base);
> >>>> +      kern_end = grub_max (kern_end, xen_state.xen_inf.hypercall_page -
> >>>> +                                     xen_state.xen_inf.virt_base + 
> >>>> PAGE_SIZE);
> >>>>      }
> >>>>
> >>>> -  max_addr = ALIGN_UP (kern_end, PAGE_SIZE);
> >>>> +  xen_state.max_addr = ALIGN_UP (kern_end, PAGE_SIZE);
> >>>>
> >>>> -  err = grub_relocator_alloc_chunk_addr (relocator, &ch, kern_start,
> >>>> +  err = grub_relocator_alloc_chunk_addr (xen_state.relocator, &ch, 
> >>>> kern_start,
> >>>>                                           kern_end - kern_start);
> >>>>    if (err)
> >>>>      goto fail;
> >>>>    kern_chunk_src = get_virtual_current_address (ch);
> >>>>
> >>>>    grub_dprintf ("xen", "paddr_offset = 0x%llx\n",
> >>>> -                (unsigned long long) xen_inf.paddr_offset);
> >>>> +                (unsigned long long) xen_state.xen_inf.paddr_offset);
> >>>>    grub_dprintf ("xen", "kern_start = 0x%llx, kern_end = 0x%llx\n",
> >>>> -                (unsigned long long) xen_inf.kern_start,
> >>>> -                (unsigned long long) xen_inf.kern_end);
> >>>> +                (unsigned long long) xen_state.xen_inf.kern_start,
> >>>> +                (unsigned long long) xen_state.xen_inf.kern_end);
> >>>>
> >>>>    err = grub_elfXX_load (elf, argv[0],
> >>>>                           (grub_uint8_t *) kern_chunk_src - kern_start
> >>>> -                         - xen_inf.paddr_offset, 0, 0, 0);
> >>>> +                         - xen_state.xen_inf.paddr_offset, 0, 0, 0);
> >>>>
> >>>> -  if (xen_inf.has_hypercall_page)
> >>>> +  if (xen_state.xen_inf.has_hypercall_page)
> >>>>      {
> >>>>        unsigned i;
> >>>>        for (i = 0; i < PAGE_SIZE / HYPERCALL_INTERFACE_SIZE; i++)
> >>>>          set_hypercall_interface ((grub_uint8_t *) kern_chunk_src +
> >>>>                                   i * HYPERCALL_INTERFACE_SIZE +
> >>>> -                                 xen_inf.hypercall_page - 
> >>>> xen_inf.virt_base -
> >>>> -                                 kern_start, i);
> >>>> +                                 xen_state.xen_inf.hypercall_page -
> >>>> +                                 xen_state.xen_inf.virt_base - 
> >>>> kern_start, i);
> >>>>      }
> >>>>
> >>>>    if (err)
> >>>>      goto fail;
> >>>>
> >>>>    grub_dl_ref (my_mod);
> >>>> -  loaded = 1;
> >>>> +  xen_state.loaded = 1;
> >>>>
> >>>>    grub_loader_set (grub_xen_boot, grub_xen_unload, 0);
> >>>> -  loaded = 1;
> >>>>
> >>>>    goto fail;
> >>>>
> >>>> @@ -540,14 +548,14 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ 
> >>>> ((unused)),
> >>>>        goto fail;
> >>>>      }
> >>>>
> >>>> -  if (!loaded)
> >>>> +  if (!xen_state.loaded)
> >>>>      {
> >>>>        grub_error (GRUB_ERR_BAD_ARGUMENT,
> >>>>                    N_("you need to load the kernel first"));
> >>>>        goto fail;
> >>>>      }
> >>>>
> >>>> -  if (next_start.mod_start || next_start.mod_len)
> >>>> +  if (xen_state.next_start.mod_start || xen_state.next_start.mod_len)
> >>>>      {
> >>>>        grub_error (GRUB_ERR_BAD_ARGUMENT, N_("initrd already loaded"));
> >>>>        goto fail;
> >>>> @@ -560,7 +568,8 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ 
> >>>> ((unused)),
> >>>>
> >>>>    if (size)
> >>>>      {
> >>>> -      err = grub_relocator_alloc_chunk_addr (relocator, &ch, max_addr, 
> >>>> size);
> >>>> +      err = grub_relocator_alloc_chunk_addr (xen_state.relocator, &ch,
> >>>> +                                             xen_state.max_addr, size);
> >>>>        if (err)
> >>>>          goto fail;
> >>>>
> >>>> @@ -569,13 +578,14 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ 
> >>>> ((unused)),
> >>>>          goto fail;
> >>>>      }
> >>>>
> >>>> -  next_start.mod_start = max_addr + xen_inf.virt_base;
> >>>> -  next_start.mod_len = size;
> >>>> +  xen_state.next_start.mod_start =
> >>>> +    xen_state.max_addr + xen_state.xen_inf.virt_base;
> >>>> +  xen_state.next_start.mod_len = size;
> >>>>
> >>>> -  max_addr = ALIGN_UP (max_addr + size, PAGE_SIZE);
> >>>> +  xen_state.max_addr = ALIGN_UP (xen_state.max_addr + size, PAGE_SIZE);
> >>>>
> >>>>    grub_dprintf ("xen", "Initrd, addr=0x%x, size=0x%x\n",
> >>>> -                (unsigned) next_start.mod_start, (unsigned) size);
> >>>> +                (unsigned) xen_state.next_start.mod_start, (unsigned) 
> >>>> size);
> >>>>
> >>>>  fail:
> >>>>    grub_initrd_close (&initrd_ctx);
> >>>> @@ -607,45 +617,48 @@ grub_cmd_module (grub_command_t cmd __attribute__ 
> >>>> ((unused)),
> >>>>    if (argc == 0)
> >>>>      return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
> >>>>
> >>>> -  if (!loaded)
> >>>> +  if (!xen_state.loaded)
> >>>>      {
> >>>>        return grub_error (GRUB_ERR_BAD_ARGUMENT,
> >>>>                           N_("you need to load the kernel first"));
> >>>>      }
> >>>>
> >>>> -  if ((next_start.mod_start || next_start.mod_len) && 
> >>>> !xen_module_info_page)
> >>>> +  if ((xen_state.next_start.mod_start || xen_state.next_start.mod_len) 
> >>>> &&
> >>>> +      !xen_state.module_info_page)
> >>>>      {
> >>>>        return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("initrd already 
> >>>> loaded"));
> >>>>      }
> >>>>
> >>>>    /* Leave one space for terminator.  */
> >>>> -  if (n_modules >= MAX_MODULES - 1)
> >>>> +  if (xen_state.n_modules >= MAX_MODULES - 1)
> >>>>      {
> >>>>        return grub_error (GRUB_ERR_BAD_ARGUMENT, "too many modules");
> >>>>      }
> >>>>
> >>>> -  if (!xen_module_info_page)
> >>>> +  if (!xen_state.module_info_page)
> >>>>      {
> >>>> -      n_modules = 0;
> >>>> -      max_addr = ALIGN_UP (max_addr, PAGE_SIZE);
> >>>> -      modules_target_start = max_addr;
> >>>> -      next_start.mod_start = max_addr + xen_inf.virt_base;
> >>>> -      next_start.flags |= SIF_MULTIBOOT_MOD;
> >>>> +      xen_state.n_modules = 0;
> >>>> +      xen_state.max_addr = ALIGN_UP (xen_state.max_addr, PAGE_SIZE);
> >>>> +      xen_state.modules_target_start = xen_state.max_addr;
> >>>> +      xen_state.next_start.mod_start =
> >>>> +        xen_state.max_addr + xen_state.xen_inf.virt_base;

Now that we have 8 characters worth of quoting and patch indentation,
it looks perfect again. :)

> >>> Lost one space.
> >>
> >> Really? Common indentation style seams to be to use tabs where possible.
> >> And this is a tab.
> > 
> > But your line continuation is indented LESS than the line it is
> > continuing, which is clearly NOT the style.
> 
> No. Tabs are 8 spaces and have been so in this file and in others as
> well.

Oh right.  The horrible GNU coding style of 2 space indentation but tab
replacing 8 spaces, which then gets messed up and looks weird when you
start quoting it in email.  It would be hard to come up with a worse
indentation style than the GNU one.

> BTW: any reason you omitted me from the to: and cc: list?

I just hit reply-all, so no idea why it would have been dropped.

-- 
Len Sorensen


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