On 9/18/24 10:46 AM, Muhammad Usama Anjum wrote: > On 9/17/24 6:56 AM, Shuah Khan wrote: >> On 9/16/24 00:32, Muhammad Usama Anjum wrote: >>> On 9/12/24 8:44 PM, Shuah Khan wrote: >>>> On 9/12/24 04:31, Muhammad Usama Anjum wrote: >>>>> The value of __NR_userfaultfd was changed to 282 when >>>>> asm-generic/unistd.h was included. It makes the test to fail every time >>>>> as the correct number of this syscall on x86_64 is 323. Fix the header >>>>> to asm/unistd.h. >>>>> >>>> >>>> "please elaborate every time" - I just built on my x86_64 and built >>>> just fine. >>> The build isn't broken. >>> >>>> I am not saying this isn't a problem, it is good to >>>> understand why and how it is failing before making the change. >>> I mean to say that the test is failing at run time because the correct >>> userfaultfd syscall isn't being found with __NR_userfaultfd = 282. >>> _NR_userfaultfd's value depends on the header. When asm-generic/unistd.h >>> is included, its value (282) is wrong. I've tested on x86_64. >>> >> >> Okay - how do you know this is wrong? can you provide more details. >> >> git grep _NR_userfaultfd >> include/uapi/asm-generic/unistd.h:#define __NR_userfaultfd 282 >> include/uapi/asm-generic/unistd.h:__SYSCALL(__NR_userfaultfd, >> sys_userfaultfd) >> tools/include/uapi/asm-generic/unistd.h:#define __NR_userfaultfd 282 >> >>> The fix is simple. Add the correct header which has _NR_userfaultfd = >>> 323. > > grep -rnIF "#define __NR_userfaultfd" > tools/include/uapi/asm-generic/unistd.h:681:#define __NR_userfaultfd 282 > arch/x86/include/generated/uapi/asm/unistd_32.h:374:#define > __NR_userfaultfd 374 > arch/x86/include/generated/uapi/asm/unistd_64.h:327:#define > __NR_userfaultfd 323 > arch/x86/include/generated/uapi/asm/unistd_x32.h:282:#define > __NR_userfaultfd (__X32_SYSCALL_BIT + 323) > arch/arm/include/generated/uapi/asm/unistd-eabi.h:347:#define > __NR_userfaultfd (__NR_SYSCALL_BASE + 388) > arch/arm/include/generated/uapi/asm/unistd-oabi.h:359:#define > __NR_userfaultfd (__NR_SYSCALL_BASE + 388) > include/uapi/asm-generic/unistd.h:681:#define __NR_userfaultfd 282 > > The number is dependent on the architecture. The above data shows that: > x86 374 > x86_64 323 > > I'm unable to find the history of why it is set to 282 in unistd.h and > when this problem happened. Does anybody has understanding of this? > >> >> I need more details on this number. >> >> thanks, >> -- Shuah > -- BR, Muhammad Usama Anjum
