Hi Christoffer, [auto build test WARNING on: kvmarm/next] [also build test WARNING on: v4.3 next-20151105] url: https://github.com/0day-ci/linux/commits/Christoffer-Dall/KVM-arm-Don-t-try-to-flush-hyp-mode-device-mappings/20151105-232548 base: https://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm.git next config: arm-axm55xx_defconfig (attached as .config) reproduce: wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree make.cross ARCH=arm All warnings (new ones prefixed by >>): arch/arm/kvm/mmu.c: In function 'unmap_ptes': >> arch/arm/kvm/mmu.c:212:3: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement] pte_t old_pte = *pte; ^ vim +212 arch/arm/kvm/mmu.c 363ef89f8 Marc Zyngier 2014-12-19 196 * 363ef89f8 Marc Zyngier 2014-12-19 197 * This is why right after unmapping a page/section and invalidating 363ef89f8 Marc Zyngier 2014-12-19 198 * the corresponding TLBs, we call kvm_flush_dcache_p*() to make sure 363ef89f8 Marc Zyngier 2014-12-19 199 * the IO subsystem will never hit in the cache. 363ef89f8 Marc Zyngier 2014-12-19 200 */ 4f853a714 Christoffer Dall 2014-05-09 201 static void unmap_ptes(struct kvm *kvm, pmd_t *pmd, 4f853a714 Christoffer Dall 2014-05-09 202 phys_addr_t addr, phys_addr_t end) 4f728276f Marc Zyngier 2013-04-12 203 { 4f853a714 Christoffer Dall 2014-05-09 204 phys_addr_t start_addr = addr; 4f853a714 Christoffer Dall 2014-05-09 205 pte_t *pte, *start_pte; 4f853a714 Christoffer Dall 2014-05-09 206 4f853a714 Christoffer Dall 2014-05-09 207 start_pte = pte = pte_offset_kernel(pmd, addr); 4f853a714 Christoffer Dall 2014-05-09 208 do { 8e9a96138 Christoffer Dall 2015-11-05 209 if (pte_none(*pte)) 8e9a96138 Christoffer Dall 2015-11-05 210 continue; 8e9a96138 Christoffer Dall 2015-11-05 211 363ef89f8 Marc Zyngier 2014-12-19 @212 pte_t old_pte = *pte; 363ef89f8 Marc Zyngier 2014-12-19 213 4f728276f Marc Zyngier 2013-04-12 214 kvm_set_pte(pte, __pte(0)); d4cb9df5d Marc Zyngier 2013-05-14 215 kvm_tlb_flush_vmid_ipa(kvm, addr); 363ef89f8 Marc Zyngier 2014-12-19 216 363ef89f8 Marc Zyngier 2014-12-19 217 /* No need to invalidate the cache for device mappings */ 8e9a96138 Christoffer Dall 2015-11-05 218 if ((pte_val(old_pte) & PAGE_S2_DEVICE) != PAGE_S2_DEVICE && 8e9a96138 Christoffer Dall 2015-11-05 219 (pte_val(old_pte) & PAGE_HYP_DEVICE) != PAGE_HYP_DEVICE) 363ef89f8 Marc Zyngier 2014-12-19 220 kvm_flush_dcache_pte(old_pte); :::::: The code at line 212 was first introduced by commit :::::: 363ef89f8e9bcedc28b976d0fe2d858fe139c122 arm/arm64: KVM: Invalidate data cache on unmap :::::: TO: Marc Zyngier <marc.zyngier@xxxxxxx> :::::: CC: Christoffer Dall <christoffer.dall@xxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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