linux-kernel - [Bug Report] Wrong value of __NR_userfaultfd in asm-generic/unistd.h

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Message-ID: <3d07e4c3-e413-4378-82da-265a477bedb3@collabora.com>
Date: Mon, 21 Oct 2024 11:48:57 +0500
From: Muhammad Usama Anjum <Usama.Anjum@...labora.com>
To: Andrew Morton <akpm@...ux-foundation.org>, Shuah Khan <shuah@...nel.org>,
 David Hildenbrand <david@...hat.com>, Peter Xu <peterx@...hat.com>,
 "Dr. David Alan Gilbert" <dgilbert@...hat.com>,
 Andrea Arcangeli <aarcange@...hat.com>, Kim Phillips <kim.phillips@....com>
Cc: Usama.Anjum@...labora.com, kernel@...labora.com, linux-mm@...ck.org,
 linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
 John Hubbard <jhubbard@...dia.com>, Shuah Khan <skhan@...uxfoundation.org>
Subject: [Bug Report] Wrong value of __NR_userfaultfd in asm-generic/unistd.h

Hi,

The asm-generic/unistd.h file has wrong __NR_userfaultfd syscall number which
doesn't even depend on the architecture. This has caused failure of a selftest
which was fixed recently [1]. 

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 it
is different for different arch:
x86	374
x86_64	323
ARM     347/358

It seems include/uapi/asm-generic/unistd has wrong 282 value in it. Maybe I'm
missing some context.. Please have a look at it.

The __NR_userfaultfd was added to include/uapi/asm-generic/unistd.h in
09f7298100ea ("Subject: [PATCH] userfaultfd: register uapi generic syscall (aarch64)").

[1] https://lore.kernel.org/all/20240912103151.1520254-1-usama.anjum@collabora.com 

-- 
BR,
/Muhammad Usama Anjum