Re: [PATCH] fs/proc/task_mmu: add VM_SHADOW_STACK for arm64 when support GCS
From: kernel test robot
Date: Sat Jun 07 2025 - 06:29:53 EST
Hi wangfushuai,
kernel test robot noticed the following build warnings:
[auto build test WARNING on brauner-vfs/vfs.all]
[also build test WARNING on akpm-mm/mm-everything linus/master v6.15 next-20250606]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/wangfushuai/fs-proc-task_mmu-add-VM_SHADOW_STACK-for-arm64-when-support-GCS/20250607-141047
base: https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git vfs.all
patch link: https://lore.kernel.org/r/20250607060741.69902-1-wangfushuai%40baidu.com
patch subject: [PATCH] fs/proc/task_mmu: add VM_SHADOW_STACK for arm64 when support GCS
config: x86_64-buildonly-randconfig-001-20250607 (https://download.01.org/0day-ci/archive/20250607/202506071806.mshFK42h-lkp@xxxxxxxxx/config)
compiler: clang version 20.1.2 (https://github.com/llvm/llvm-project 58df0ef89dd64126512e4ee27b4ac3fd8ddf6247)
rustc: rustc 1.78.0 (9b00956e5 2024-04-29)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250607/202506071806.mshFK42h-lkp@xxxxxxxxx/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202506071806.mshFK42h-lkp@xxxxxxxxx/
All warnings (new ones prefixed by >>):
>> fs/proc/task_mmu.c:994:42: warning: extra tokens at end of #ifdef directive [-Wextra-tokens]
994 | #ifdef CONFIG_ARCH_HAS_USER_SHADOW_STACK || defined(CONFIG_ARM64_GCS)
| ^
| //
1 warning generated.
vim +994 fs/proc/task_mmu.c
920
921 static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
922 {
923 /*
924 * Don't forget to update Documentation/ on changes.
925 *
926 * The length of the second argument of mnemonics[]
927 * needs to be 3 instead of previously set 2
928 * (i.e. from [BITS_PER_LONG][2] to [BITS_PER_LONG][3])
929 * to avoid spurious
930 * -Werror=unterminated-string-initialization warning
931 * with GCC 15
932 */
933 static const char mnemonics[BITS_PER_LONG][3] = {
934 /*
935 * In case if we meet a flag we don't know about.
936 */
937 [0 ... (BITS_PER_LONG-1)] = "??",
938
939 [ilog2(VM_READ)] = "rd",
940 [ilog2(VM_WRITE)] = "wr",
941 [ilog2(VM_EXEC)] = "ex",
942 [ilog2(VM_SHARED)] = "sh",
943 [ilog2(VM_MAYREAD)] = "mr",
944 [ilog2(VM_MAYWRITE)] = "mw",
945 [ilog2(VM_MAYEXEC)] = "me",
946 [ilog2(VM_MAYSHARE)] = "ms",
947 [ilog2(VM_GROWSDOWN)] = "gd",
948 [ilog2(VM_PFNMAP)] = "pf",
949 [ilog2(VM_LOCKED)] = "lo",
950 [ilog2(VM_IO)] = "io",
951 [ilog2(VM_SEQ_READ)] = "sr",
952 [ilog2(VM_RAND_READ)] = "rr",
953 [ilog2(VM_DONTCOPY)] = "dc",
954 [ilog2(VM_DONTEXPAND)] = "de",
955 [ilog2(VM_LOCKONFAULT)] = "lf",
956 [ilog2(VM_ACCOUNT)] = "ac",
957 [ilog2(VM_NORESERVE)] = "nr",
958 [ilog2(VM_HUGETLB)] = "ht",
959 [ilog2(VM_SYNC)] = "sf",
960 [ilog2(VM_ARCH_1)] = "ar",
961 [ilog2(VM_WIPEONFORK)] = "wf",
962 [ilog2(VM_DONTDUMP)] = "dd",
963 #ifdef CONFIG_ARM64_BTI
964 [ilog2(VM_ARM64_BTI)] = "bt",
965 #endif
966 #ifdef CONFIG_MEM_SOFT_DIRTY
967 [ilog2(VM_SOFTDIRTY)] = "sd",
968 #endif
969 [ilog2(VM_MIXEDMAP)] = "mm",
970 [ilog2(VM_HUGEPAGE)] = "hg",
971 [ilog2(VM_NOHUGEPAGE)] = "nh",
972 [ilog2(VM_MERGEABLE)] = "mg",
973 [ilog2(VM_UFFD_MISSING)]= "um",
974 [ilog2(VM_UFFD_WP)] = "uw",
975 #ifdef CONFIG_ARM64_MTE
976 [ilog2(VM_MTE)] = "mt",
977 [ilog2(VM_MTE_ALLOWED)] = "",
978 #endif
979 #ifdef CONFIG_ARCH_HAS_PKEYS
980 /* These come out via ProtectionKey: */
981 [ilog2(VM_PKEY_BIT0)] = "",
982 [ilog2(VM_PKEY_BIT1)] = "",
983 [ilog2(VM_PKEY_BIT2)] = "",
984 #if VM_PKEY_BIT3
985 [ilog2(VM_PKEY_BIT3)] = "",
986 #endif
987 #if VM_PKEY_BIT4
988 [ilog2(VM_PKEY_BIT4)] = "",
989 #endif
990 #endif /* CONFIG_ARCH_HAS_PKEYS */
991 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_MINOR
992 [ilog2(VM_UFFD_MINOR)] = "ui",
993 #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_MINOR */
> 994 #ifdef CONFIG_ARCH_HAS_USER_SHADOW_STACK || defined(CONFIG_ARM64_GCS)
995 [ilog2(VM_SHADOW_STACK)] = "ss",
996 #endif
997 #if defined(CONFIG_64BIT) || defined(CONFIG_PPC32)
998 [ilog2(VM_DROPPABLE)] = "dp",
999 #endif
1000 #ifdef CONFIG_64BIT
1001 [ilog2(VM_SEALED)] = "sl",
1002 #endif
1003 };
1004 size_t i;
1005
1006 seq_puts(m, "VmFlags: ");
1007 for (i = 0; i < BITS_PER_LONG; i++) {
1008 if (!mnemonics[i][0])
1009 continue;
1010 if (vma->vm_flags & (1UL << i))
1011 seq_printf(m, "%s ", mnemonics[i]);
1012 }
1013 seq_putc(m, '\n');
1014 }
1015
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