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Date:   Wed, 13 Jan 2021 17:04:01 -0800
From:   Minchan Kim <minchan@...nel.org>
To:     kernel test robot <lkp@...el.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, kbuild-all@...ts.01.org,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>, hyesoo.yu@...sung.com,
        david@...hat.com, mhocko@...e.com, surenb@...gle.com,
        pullip.cho@...sung.com, joaodias@...gle.com, hridya@...gle.com
Subject: Re: [PATCH v3 4/4] dma-buf: heaps: add chunk heap to dmabuf heaps

On Wed, Jan 13, 2021 at 11:11:56AM +0800, kernel test robot wrote:
> Hi Minchan,
> 
> Thank you for the patch! Perhaps something to improve:
> 
> [auto build test WARNING on next-20210112]
> [cannot apply to s390/features robh/for-next linux/master linus/master hnaz-linux-mm/master v5.11-rc3 v5.11-rc2 v5.11-rc1 v5.11-rc3]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch]
> 
> url:    https://github.com/0day-ci/linux/commits/Minchan-Kim/Chunk-Heap-Support-on-DMA-HEAP/20210113-092747
> base:    df869cab4b3519d603806234861aa0a39df479c0
> config: mips-allyesconfig (attached as .config)
> compiler: mips-linux-gcc (GCC) 9.3.0
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # https://github.com/0day-ci/linux/commit/531ebc21d3c2584784d44714e3b4f1df46b80eee
>         git remote add linux-review https://github.com/0day-ci/linux
>         git fetch --no-tags linux-review Minchan-Kim/Chunk-Heap-Support-on-DMA-HEAP/20210113-092747
>         git checkout 531ebc21d3c2584784d44714e3b4f1df46b80eee
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips 
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All warnings (new ones prefixed by >>):
> 
>    drivers/dma-buf/heaps/chunk_heap.c: In function 'chunk_heap_do_vmap':
>    drivers/dma-buf/heaps/chunk_heap.c:215:24: error: implicit declaration of function 'vmalloc'; did you mean 'kvmalloc'? [-Werror=implicit-function-declaration]
>      215 |  struct page **pages = vmalloc(sizeof(struct page *) * npages);
>          |                        ^~~~~~~
>          |                        kvmalloc

Looks like we need vmalloc.h.


> >> drivers/dma-buf/heaps/chunk_heap.c:215:24: warning: initialization of 'struct page **' from 'int' makes pointer from integer without a cast [-Wint-conversion]
>    drivers/dma-buf/heaps/chunk_heap.c:228:10: error: implicit declaration of function 'vmap'; did you mean 'kmap'? [-Werror=implicit-function-declaration]
>      228 |  vaddr = vmap(pages, npages, VM_MAP, PAGE_KERNEL);
>          |          ^~~~
>          |          kmap

We need vmap, not kmap.

>    drivers/dma-buf/heaps/chunk_heap.c:228:30: error: 'VM_MAP' undeclared (first use in this function); did you mean 'VM_MTE'?
>      228 |  vaddr = vmap(pages, npages, VM_MAP, PAGE_KERNEL);
>          |                              ^~~~~~
>          |                              VM_MTE

Looks like bot was confused since we have missed the vmalloc.h
In next spin, let's fix it.

>    drivers/dma-buf/heaps/chunk_heap.c:228:30: note: each undeclared identifier is reported only once for each function it appears in
>    drivers/dma-buf/heaps/chunk_heap.c:229:2: error: implicit declaration of function 'vfree'; did you mean 'kvfree'? [-Werror=implicit-function-declaration]
>      229 |  vfree(pages);
>          |  ^~~~~
>          |  kvfree
>    drivers/dma-buf/heaps/chunk_heap.c: In function 'chunk_heap_vunmap':
>    drivers/dma-buf/heaps/chunk_heap.c:268:3: error: implicit declaration of function 'vunmap'; did you mean 'kunmap'? [-Werror=implicit-function-declaration]
>      268 |   vunmap(buffer->vaddr);
>          |   ^~~~~~
>          |   kunmap
>    cc1: some warnings being treated as errors
> 
> 
> vim +215 drivers/dma-buf/heaps/chunk_heap.c
> 
>    210	
>    211	static void *chunk_heap_do_vmap(struct chunk_heap_buffer *buffer)
>    212	{
>    213		struct sg_table *table = &buffer->sg_table;
>    214		int npages = PAGE_ALIGN(buffer->len) / PAGE_SIZE;
>  > 215		struct page **pages = vmalloc(sizeof(struct page *) * npages);
>    216		struct page **tmp = pages;
>    217		struct sg_page_iter piter;
>    218		void *vaddr;
>    219	
>    220		if (!pages)
>    221			return ERR_PTR(-ENOMEM);
>    222	
>    223		for_each_sgtable_page(table, &piter, 0) {
>    224			WARN_ON(tmp - pages >= npages);
>    225			*tmp++ = sg_page_iter_page(&piter);
>    226		}
>    227	
>    228		vaddr = vmap(pages, npages, VM_MAP, PAGE_KERNEL);
>    229		vfree(pages);
>    230	
>    231		if (!vaddr)
>    232			return ERR_PTR(-ENOMEM);
>    233	
>    234		return vaddr;
>    235	}
>    236	
> 
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org


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