Le 11/04/2018 à 10:41, Laurent Dufour a écrit :
On 11/04/2018 10:33, Michal Hocko wrote:
On Wed 11-04-18 10:03:36, Laurent Dufour wrote:
@@ -881,7 +876,8 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, 
unsigned long addr,
if (is_zero_pfn(pfn))
                return NULL;
+check_pfn: __maybe_unused
        if (unlikely(pfn > highest_memmap_pfn)) {
                print_bad_pte(vma, addr, pte, NULL);
                return NULL;
@@ -891,7 +887,7 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, 
unsigned long addr,
         * NOTE! We still have PageReserved() pages in the page tables.
         * eg. VDSO mappings can cause them to exist.
+out: __maybe_unused
        return pfn_to_page(pfn);

Why do we need this ugliness all of the sudden?
Indeed the compiler doesn't complaint but in theory it should since these
labels are not used depending on CONFIG_ARCH_HAS_PTE_SPECIAL.

Why should it complain ?


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