On Wed, May 30, 2018 at 4:46 PM, Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote: > On Wed, May 30, 2018 at 09:10:47AM +0530, Souptick Joarder wrote: >> On Tue, May 29, 2018 at 11:04 PM, Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote: >> > I see: >> > >> > mm/gup.c:817:15: warning: invalid assignment: |= >> > mm/gup.c:817:15: left side has type int >> > mm/gup.c:817:15: right side has type restricted vm_fault_t >> > >> > are you building with 'c=2' or 'C=2'? >> >> Building with C=2. >> Do I need to enable any separate FLAG ? > > Nope. Here's what I have: > > willy@bobo:~/kernel/souptick$ make C=2 mm/gup.o > CHK include/config/kernel.release > CHK include/generated/uapi/linux/version.h > CHK include/generated/utsrelease.h > CHECK arch/x86/purgatory/purgatory.c > CHECK arch/x86/purgatory/sha256.c > CHECK arch/x86/purgatory/string.c > arch/x86/purgatory/../boot/string.c:134:6: warning: symbol 'simple_strtol' was not declared. Should it be static? > CHK include/generated/bounds.h > CHK include/generated/timeconst.h > CHK include/generated/asm-offsets.h > CALL scripts/checksyscalls.sh > DESCEND objtool > CHECK scripts/mod/empty.c > CHK scripts/mod/devicetable-offsets.h > CHECK mm/gup.c > mm/gup.c:817:15: warning: invalid assignment: |= > mm/gup.c:817:15: left side has type int > mm/gup.c:817:15: right side has type restricted vm_fault_t > CC mm/gup.o > Matthew, Due to some unidentified error still not able to catch this warning in (X86_64 + sparse) compilation. It is constantly showing below error. Documents/linux-4.17-rc7$ make C=2 -j4 mm/gup.o CHK include/config/kernel.release CHK include/generated/uapi/linux/version.h DESCEND objtool CHK include/generated/utsrelease.h CHECK scripts/mod/empty.c CHK scripts/mod/devicetable-offsets.h CHK include/generated/bounds.h CHK include/generated/timeconst.h CHK include/generated/asm-offsets.h CALL scripts/checksyscalls.sh CHECK mm/gup.c mm/gup.c:394:17: error: undefined identifier '__COUNTER__' mm/gup.c:439:9: error: undefined identifier '__COUNTER__' mm/gup.c:441:9: error: undefined identifier '__COUNTER__' mm/gup.c:443:9: error: undefined identifier '__COUNTER__' mm/gup.c:508:17: error: undefined identifier '__COUNTER__' mm/gup.c:716:25: error: undefined identifier '__COUNTER__' mm/gup.c:826:17: error: undefined identifier '__COUNTER__' mm/gup.c:863:17: error: undefined identifier '__COUNTER__' mm/gup.c:865:17: error: undefined identifier '__COUNTER__' mm/gup.c:882:25: error: undefined identifier '__COUNTER__' mm/gup.c:883:25: error: undefined identifier '__COUNTER__' mm/gup.c:920:25: error: undefined identifier '__COUNTER__' ./include/linux/hugetlb.h:239:9: error: undefined identifier '__COUNTER__' But able to capture it in (powerpc + sparse) compilation. I will fix it in v2. /Documents/linux-4.17-rc7$ make C=2 ARCH=powerpc CROSS_COMPILE=powerpc-linux-gnu- mm/gup.o CHK include/config/kernel.release CHK include/generated/uapi/linux/version.h CHK include/generated/utsrelease.h CHK include/generated/bounds.h CHK include/generated/timeconst.h CHK include/generated/asm-offsets.h CALL scripts/checksyscalls.sh CHECK scripts/mod/empty.c CHK scripts/mod/devicetable-offsets.h CHECK mm/gup.c ./arch/powerpc/include/asm/book3s/64/pgtable.h:669:24: warning: restricted __be64 degrades to integer mm/gup.c:820:15: warning: incorrect type in assignment (different base types) mm/gup.c:820:15: expected int [signed] major mm/gup.c:820:15: got restricted vm_fault_t mm/gup.c:1247:24: warning: expression using sizeof bool mm/gup.c:1247:24: warning: expression using sizeof(void) mm/gup.c:1247:24: warning: expression using sizeof(void) ./arch/powerpc/include/asm/book3s/64/pgtable.h:667:20: warning: incorrect type in initializer (different base types) ./arch/powerpc/include/asm/book3s/64/pgtable.h:667:20: expected unsigned long long [unsigned] [usertype] mask ./arch/powerpc/include/asm/book3s/64/pgtable.h:667:20: got restricted __be64 [usertype] <noident> mm/gup.c:1735:6: warning: symbol 'gup_fast_permitted' was not declared. Should it be static? CC mm/gup.o Also Sparse is throwing below warning -> /Documents/linux-4.17-rc7$ make C=2 ARCH=powerpc CROSS_COMPILE=powerpc-linux-gnu- mm/hugetlb.o CHK include/config/kernel.release CHK include/generated/uapi/linux/version.h CHK include/generated/utsrelease.h CHK include/generated/bounds.h CHK include/generated/timeconst.h CHK include/generated/asm-offsets.h CALL scripts/checksyscalls.sh CHECK scripts/mod/empty.c CHK scripts/mod/devicetable-offsets.h CHECK mm/hugetlb.c mm/hugetlb.c:3778:33: warning: restricted vm_fault_t degrades to integer mm/hugetlb.c:3777:31: warning: restricted vm_fault_t degrades to integer mm/hugetlb.c:3777:29: warning: incorrect type in assignment (different base types) mm/hugetlb.c:3777:29: expected restricted vm_fault_t [assigned] [usertype] ret mm/hugetlb.c:3777:29: got unsigned int mm/hugetlb.c:3895:33: warning: restricted vm_fault_t degrades to integer mm/hugetlb.c:3894:32: warning: restricted vm_fault_t degrades to integer mm/hugetlb.c:3894:56: warning: incorrect type in return expression (different base types) mm/hugetlb.c:3894:56: expected restricted vm_fault_t mm/hugetlb.c:3894:56: got unsigned int Which is fixed by -> "#define VM_FAULT_SET_HINDEX(x) ((__force vm_fault_t)((x) << 16))" in final vm_fault_t patch. Does it looks good ?
