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Date:   Fri, 21 Sep 2018 10:58:53 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Keith Busch <keith.busch@...el.com>
Cc:     kbuild-all@...org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Keith Busch <keith.busch@...el.com>
Subject: Re: [PATCH 6/7] mm/gup: Combine parameters into struct

Hi Keith,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.19-rc4 next-20180919]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Keith-Busch/mm-faster-get-user-pages/20180920-184931
config: arm-oxnas_v6_defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.2.0 make.cross ARCH=arm 

All errors (new ones prefixed by >>):

   In file included from include/linux/mm.h:506:0,
                    from mm/gup.c:6:
   include/linux/huge_mm.h:344:53: warning: 'struct gup_context' declared inside parameter list will not be visible outside of this definition or declaration
    static inline struct page *follow_devmap_pmd(struct gup_context *ctx, pmd_t *pmd)
                                                        ^~~~~~~~~~~
   include/linux/huge_mm.h:349:53: warning: 'struct gup_context' declared inside parameter list will not be visible outside of this definition or declaration
    static inline struct page *follow_devmap_pud(struct gup_context *ctx, pud_t *pud)
                                                        ^~~~~~~~~~~
   mm/gup.c: In function 'follow_pmd_mask':
>> mm/gup.c:233:34: error: macro "follow_huge_pd" passed 5 arguments, but takes just 3
              ctx->flags, PGDIR_SHIFT);
                                     ^
>> mm/gup.c:231:10: error: 'follow_huge_pd' undeclared (first use in this function); did you mean 'follow_page_pte'?
      page = follow_huge_pd(ctx->vma, ctx->address,
             ^~~~~~~~~~~~~~
             follow_page_pte
   mm/gup.c:231:10: note: each undeclared identifier is reported only once for each function it appears in
>> mm/gup.c:257:28: error: passing argument 1 of 'follow_devmap_pmd' from incompatible pointer type [-Werror=incompatible-pointer-types]
      page = follow_devmap_pmd(ctx, pmd);
                               ^~~
   In file included from include/linux/mm.h:506:0,
                    from mm/gup.c:6:
   include/linux/huge_mm.h:344:28: note: expected 'struct gup_context *' but argument is of type 'struct follow_page_context *'
    static inline struct page *follow_devmap_pmd(struct gup_context *ctx, pmd_t *pmd)
                               ^~~~~~~~~~~~~~~~~
   mm/gup.c: In function 'follow_pud_mask':
   mm/gup.c:333:32: error: macro "follow_huge_pd" passed 5 arguments, but takes just 3
              ctx->flags, PUD_SHIFT);
                                   ^
   mm/gup.c:331:10: error: 'follow_huge_pd' undeclared (first use in this function); did you mean 'follow_page_pte'?
      page = follow_huge_pd(ctx->vma, ctx->address,
             ^~~~~~~~~~~~~~
             follow_page_pte
>> mm/gup.c:340:28: error: passing argument 1 of 'follow_devmap_pud' from incompatible pointer type [-Werror=incompatible-pointer-types]
      page = follow_devmap_pud(ctx, pud);
                               ^~~
   In file included from include/linux/mm.h:506:0,
                    from mm/gup.c:6:
   include/linux/huge_mm.h:349:28: note: expected 'struct gup_context *' but argument is of type 'struct follow_page_context *'
    static inline struct page *follow_devmap_pud(struct gup_context *ctx, pud_t *pud)
                               ^~~~~~~~~~~~~~~~~
   mm/gup.c: In function 'follow_p4d_mask':
   mm/gup.c:366:32: error: macro "follow_huge_pd" passed 5 arguments, but takes just 3
              ctx->flags, P4D_SHIFT);
                                   ^
   mm/gup.c:364:10: error: 'follow_huge_pd' undeclared (first use in this function); did you mean 'follow_page_pte'?
      page = follow_huge_pd(ctx->vma, ctx->address,
             ^~~~~~~~~~~~~~
             follow_page_pte
   mm/gup.c: In function 'follow_page_mask':
   mm/gup.c:414:34: error: macro "follow_huge_pd" passed 5 arguments, but takes just 3
              ctx->flags, PGDIR_SHIFT);
                                     ^
   mm/gup.c:412:10: error: 'follow_huge_pd' undeclared (first use in this function); did you mean 'follow_page_pte'?
      page = follow_huge_pd(ctx->vma, ctx->address,
             ^~~~~~~~~~~~~~
             follow_page_pte
   cc1: some warnings being treated as errors

vim +/follow_huge_pd +233 mm/gup.c

   208	
   209	static struct page *follow_pmd_mask(struct follow_page_context *ctx, pud_t *pudp)
   210	{
   211		pmd_t *pmd, pmdval;
   212		spinlock_t *ptl;
   213		struct page *page;
   214		struct mm_struct *mm = ctx->vma->vm_mm;
   215	
   216		pmd = pmd_offset(pudp, ctx->address);
   217		/*
   218		 * The READ_ONCE() will stabilize the pmdval in a register or
   219		 * on the stack so that it will stop changing under the code.
   220		 */
   221		pmdval = READ_ONCE(*pmd);
   222		if (pmd_none(pmdval))
   223			return no_page_table(ctx);
   224		if (pmd_huge(pmdval) && ctx->vma->vm_flags & VM_HUGETLB) {
   225			page = follow_huge_pmd(mm, ctx->address, pmd, ctx->flags);
   226			if (page)
   227				return page;
   228			return no_page_table(ctx);
   229		}
   230		if (is_hugepd(__hugepd(pmd_val(pmdval)))) {
 > 231			page = follow_huge_pd(ctx->vma, ctx->address,
   232					      __hugepd(pmd_val(pmdval)),
 > 233					      ctx->flags, PGDIR_SHIFT);
   234			if (page)
   235				return page;
   236			return no_page_table(ctx);
   237		}
   238	retry:
   239		if (!pmd_present(pmdval)) {
   240			if (likely(!(ctx->flags & FOLL_MIGRATION)))
   241				return no_page_table(ctx);
   242			VM_BUG_ON(thp_migration_supported() &&
   243					  !is_pmd_migration_entry(pmdval));
   244			if (is_pmd_migration_entry(pmdval))
   245				pmd_migration_entry_wait(mm, pmd);
   246			pmdval = READ_ONCE(*pmd);
   247			/*
   248			 * MADV_DONTNEED may convert the pmd to null because
   249			 * mmap_sem is held in read mode
   250			 */
   251			if (pmd_none(pmdval))
   252				return no_page_table(ctx);
   253			goto retry;
   254		}
   255		if (pmd_devmap(pmdval)) {
   256			ptl = pmd_lock(mm, pmd);
 > 257			page = follow_devmap_pmd(ctx, pmd);
   258			spin_unlock(ptl);
   259			if (page)
   260				return page;
   261		}
   262		if (likely(!pmd_trans_huge(pmdval)))
   263			return follow_page_pte(ctx, pmd);
   264	
   265		if ((ctx->flags & FOLL_NUMA) && pmd_protnone(pmdval))
   266			return no_page_table(ctx);
   267	
   268	retry_locked:
   269		ptl = pmd_lock(mm, pmd);
   270		if (unlikely(pmd_none(*pmd))) {
   271			spin_unlock(ptl);
   272			return no_page_table(ctx);
   273		}
   274		if (unlikely(!pmd_present(*pmd))) {
   275			spin_unlock(ptl);
   276			if (likely(!(ctx->flags & FOLL_MIGRATION)))
   277				return no_page_table(ctx);
   278			pmd_migration_entry_wait(mm, pmd);
   279			goto retry_locked;
   280		}
   281		if (unlikely(!pmd_trans_huge(*pmd))) {
   282			spin_unlock(ptl);
   283			return follow_page_pte(ctx, pmd);
   284		}
   285		if (ctx->flags & FOLL_SPLIT) {
   286			int ret;
   287			page = pmd_page(*pmd);
   288			if (is_huge_zero_page(page)) {
   289				spin_unlock(ptl);
   290				ret = 0;
   291				split_huge_pmd(ctx->vma, pmd, ctx->address);
   292				if (pmd_trans_unstable(pmd))
   293					ret = -EBUSY;
   294			} else {
   295				get_page(page);
   296				spin_unlock(ptl);
   297				lock_page(page);
   298				ret = split_huge_page(page);
   299				unlock_page(page);
   300				put_page(page);
   301				if (pmd_none(*pmd))
   302					return no_page_table(ctx);
   303			}
   304	
   305			return ret ? ERR_PTR(ret) :
   306				follow_page_pte(ctx, pmd);
   307		}
   308		page = follow_trans_huge_pmd(ctx->vma, ctx->address, pmd, ctx->flags);
   309		spin_unlock(ptl);
   310		ctx->page_mask = HPAGE_PMD_NR - 1;
   311		return page;
   312	}
   313	
   314	static struct page *follow_pud_mask(struct follow_page_context *ctx, p4d_t *p4dp)
   315	{
   316		pud_t *pud;
   317		spinlock_t *ptl;
   318		struct page *page;
   319		struct mm_struct *mm = ctx->vma->vm_mm;
   320	
   321		pud = pud_offset(p4dp, ctx->address);
   322		if (pud_none(*pud))
   323			return no_page_table(ctx);
   324		if (pud_huge(*pud) && ctx->vma->vm_flags & VM_HUGETLB) {
   325			page = follow_huge_pud(mm, ctx->address, pud, ctx->flags);
   326			if (page)
   327				return page;
   328			return no_page_table(ctx);
   329		}
   330		if (is_hugepd(__hugepd(pud_val(*pud)))) {
   331			page = follow_huge_pd(ctx->vma, ctx->address,
   332					      __hugepd(pud_val(*pud)),
 > 333					      ctx->flags, PUD_SHIFT);
   334			if (page)
   335				return page;
   336			return no_page_table(ctx);
   337		}
   338		if (pud_devmap(*pud)) {
   339			ptl = pud_lock(mm, pud);
 > 340			page = follow_devmap_pud(ctx, pud);
   341			spin_unlock(ptl);
   342			if (page)
   343				return page;
   344		}
   345		if (unlikely(pud_bad(*pud)))
   346			return no_page_table(ctx);
   347	
   348		return follow_pmd_mask(ctx, pud);
   349	}
   350	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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