2021-12-18 04:04:15

by kernel test robot

Subject: [hyperv:hyperv-next 1/5] kernel/dma/swiotlb.c:166:7: warning: no previous prototype for 'swiotlb_mem_remap'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux.git hyperv-next
head: 19fd7ca00201c0525452dcf5a490e4b01674ef4c
commit: 32be866293fe5355adbf91da1cd612f439fc71e5 [1/5] swiotlb: Add swiotlb bounce buffer remap function for HV IVM
config: x86_64-randconfig-r001-20211216 (https://download.01.org/0day-ci/archive/20211218/[email protected]/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
# https://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux.git/commit/?id=32be866293fe5355adbf91da1cd612f439fc71e5
git remote add hyperv https://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux.git
git fetch --no-tags hyperv hyperv-next
git checkout 32be866293fe5355adbf91da1cd612f439fc71e5
# save the config file to linux build tree
mkdir build_dir
make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash kernel/dma/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <[email protected]>

All warnings (new ones prefixed by >>):

>> kernel/dma/swiotlb.c:166:7: warning: no previous prototype for 'swiotlb_mem_remap' [-Wmissing-prototypes]
166 | void *swiotlb_mem_remap(struct io_tlb_mem *mem, unsigned long bytes)
| ^~~~~~~~~~~~~~~~~


vim +/swiotlb_mem_remap +166 kernel/dma/swiotlb.c

160
161 /*
162 * Remap swioltb memory in the unencrypted physical address space
163 * when swiotlb_unencrypted_base is set. (e.g. for Hyper-V AMD SEV-SNP
164 * Isolation VMs).
165 */
> 166 void *swiotlb_mem_remap(struct io_tlb_mem *mem, unsigned long bytes)
167 {
168 void *vaddr = NULL;
169
170 if (swiotlb_unencrypted_base) {
171 phys_addr_t paddr = mem->start + swiotlb_unencrypted_base;
172
173 vaddr = memremap(paddr, bytes, MEMREMAP_WB);
174 if (!vaddr)
175 pr_err("Failed to map the unencrypted memory %llx size %lx.\n",
176 paddr, bytes);
177 }
178
179 return vaddr;
180 }
181

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/[email protected]

2021-12-19 12:31:33

by Wei Liu

Subject: Re: [hyperv:hyperv-next 1/5] kernel/dma/swiotlb.c:166:7: warning: no previous prototype for 'swiotlb_mem_remap'

On Sat, Dec 18, 2021 at 12:03:07PM +0800, kernel test robot wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux.git hyperv-next
> head: 19fd7ca00201c0525452dcf5a490e4b01674ef4c
> commit: 32be866293fe5355adbf91da1cd612f439fc71e5 [1/5] swiotlb: Add swiotlb bounce buffer remap function for HV IVM
> config: x86_64-randconfig-r001-20211216 (https://download.01.org/0day-ci/archive/20211218/[email protected]/config)
> compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
> reproduce (this is a W=1 build):
> # https://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux.git/commit/?id=32be866293fe5355adbf91da1cd612f439fc71e5
> git remote add hyperv https://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux.git
> git fetch --no-tags hyperv hyperv-next
> git checkout 32be866293fe5355adbf91da1cd612f439fc71e5
> # save the config file to linux build tree
> mkdir build_dir
> make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash kernel/dma/
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <[email protected]>
>
> All warnings (new ones prefixed by >>):
>
> >> kernel/dma/swiotlb.c:166:7: warning: no previous prototype for 'swiotlb_mem_remap' [-Wmissing-prototypes]
> 166 | void *swiotlb_mem_remap(struct io_tlb_mem *mem, unsigned long bytes)
> | ^~~~~~~~~~~~~~~~~
>

Adding static should fix this issue.

Wei.