Re: [PATCH] kcov: add __no_sanitize_coverage to fix noinstr for all architectures

From: kernel test robot
Date: Tue May 25 2021 - 18:23:16 EST

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In reply to: Miguel Ojeda: "Re: [PATCH] kcov: add __no_sanitize_coverage to fix noinstr for all architectures"
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Hi Marco,

I love your patch! Perhaps something to improve:

[auto build test WARNING on linux/master]
[also build test WARNING on kees/for-next/pstore linus/master v5.13-rc3 next-20210525]
[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]

url: https://github.com/0day-ci/linux/commits/Marco-Elver/kcov-add-__no_sanitize_coverage-to-fix-noinstr-for-all-architectures/20210526-020046
base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git dd860052c99b1e088352bdd4fb7aef46f8d2ef47
config: s390-randconfig-r002-20210525 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 99155e913e9bad5f7f8a247f8bb3a3ff3da74af1)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install s390 cross compiling tool for clang build
# apt-get install binutils-s390x-linux-gnu
# https://github.com/0day-ci/linux/commit/d898fa12bc72a46da1b9466bb7f8369949b714a9
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Marco-Elver/kcov-add-__no_sanitize_coverage-to-fix-noinstr-for-all-architectures/20210526-020046
git checkout d898fa12bc72a46da1b9466bb7f8369949b714a9
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=s390

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

include/uapi/linux/byteorder/big_endian.h:36:59: note: expanded from macro '__le16_to_cpu'
#define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
^
include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
#define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
^
In file included from arch/s390/kernel/traps.c:29:
In file included from include/linux/entry-common.h:6:
In file included from include/linux/tracehook.h:50:
In file included from include/linux/memcontrol.h:22:
In file included from include/linux/writeback.h:14:
In file included from include/linux/blk-cgroup.h:23:
In file included from include/linux/blkdev.h:25:
In file included from include/linux/scatterlist.h:9:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu'
#define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
^
include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
#define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
^
In file included from arch/s390/kernel/traps.c:29:
In file included from include/linux/entry-common.h:6:
In file included from include/linux/tracehook.h:50:
In file included from include/linux/memcontrol.h:22:
In file included from include/linux/writeback.h:14:
In file included from include/linux/blk-cgroup.h:23:
In file included from include/linux/blkdev.h:25:
In file included from include/linux/scatterlist.h:9:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writeb(value, PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:609:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:617:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:625:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:634:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:643:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
In file included from arch/s390/kernel/traps.c:29:
include/linux/entry-common.h:450:18: warning: unknown sanitizer 'coverage' ignored [-Wunknown-sanitizers]
irqentry_state_t noinstr irqentry_enter(struct pt_regs *regs);
^
include/linux/compiler_types.h:213:35: note: expanded from macro 'noinstr'
__no_kcsan __no_sanitize_address __no_sanitize_coverage
^
include/linux/compiler-clang.h:49:59: note: expanded from macro '__no_sanitize_coverage'
#define __no_sanitize_coverage __attribute__((no_sanitize("coverage")))
^
In file included from arch/s390/kernel/traps.c:29:
include/linux/entry-common.h:476:6: warning: unknown sanitizer 'coverage' ignored [-Wunknown-sanitizers]
void noinstr irqentry_exit(struct pt_regs *regs, irqentry_state_t state);
^
include/linux/compiler_types.h:213:35: note: expanded from macro 'noinstr'
__no_kcsan __no_sanitize_address __no_sanitize_coverage
^
include/linux/compiler-clang.h:49:59: note: expanded from macro '__no_sanitize_coverage'
#define __no_sanitize_coverage __attribute__((no_sanitize("coverage")))
^
In file included from arch/s390/kernel/traps.c:29:
include/linux/entry-common.h:484:18: warning: unknown sanitizer 'coverage' ignored [-Wunknown-sanitizers]
irqentry_state_t noinstr irqentry_nmi_enter(struct pt_regs *regs);
^
include/linux/compiler_types.h:213:35: note: expanded from macro 'noinstr'
__no_kcsan __no_sanitize_address __no_sanitize_coverage
^
include/linux/compiler-clang.h:49:59: note: expanded from macro '__no_sanitize_coverage'
#define __no_sanitize_coverage __attribute__((no_sanitize("coverage")))
^
In file included from arch/s390/kernel/traps.c:29:
include/linux/entry-common.h:495:6: warning: unknown sanitizer 'coverage' ignored [-Wunknown-sanitizers]
void noinstr irqentry_nmi_exit(struct pt_regs *regs, irqentry_state_t irq_state);
^
include/linux/compiler_types.h:213:35: note: expanded from macro 'noinstr'
__no_kcsan __no_sanitize_address __no_sanitize_coverage
^
include/linux/compiler-clang.h:49:59: note: expanded from macro '__no_sanitize_coverage'
#define __no_sanitize_coverage __attribute__((no_sanitize("coverage")))
^
>> arch/s390/kernel/traps.c:299:6: warning: unknown sanitizer 'coverage' ignored [-Wunknown-sanitizers]
void noinstr __do_pgm_check(struct pt_regs *regs)
^
include/linux/compiler_types.h:213:35: note: expanded from macro 'noinstr'
__no_kcsan __no_sanitize_address __no_sanitize_coverage
^
include/linux/compiler-clang.h:49:59: note: expanded from macro '__no_sanitize_coverage'
#define __no_sanitize_coverage __attribute__((no_sanitize("coverage")))
^
17 warnings generated.
--
include/uapi/linux/byteorder/big_endian.h:36:59: note: expanded from macro '__le16_to_cpu'
#define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
^
include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
#define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
^
In file included from arch/s390/kernel/syscall.c:34:
In file included from include/linux/entry-common.h:6:
In file included from include/linux/tracehook.h:50:
In file included from include/linux/memcontrol.h:22:
In file included from include/linux/writeback.h:14:
In file included from include/linux/blk-cgroup.h:23:
In file included from include/linux/blkdev.h:25:
In file included from include/linux/scatterlist.h:9:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu'
#define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
^
include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
#define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
^
In file included from arch/s390/kernel/syscall.c:34:
In file included from include/linux/entry-common.h:6:
In file included from include/linux/tracehook.h:50:
In file included from include/linux/memcontrol.h:22:
In file included from include/linux/writeback.h:14:
In file included from include/linux/blk-cgroup.h:23:
In file included from include/linux/blkdev.h:25:
In file included from include/linux/scatterlist.h:9:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writeb(value, PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:609:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:617:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:625:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:634:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:643:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
In file included from arch/s390/kernel/syscall.c:34:
include/linux/entry-common.h:450:18: warning: unknown sanitizer 'coverage' ignored [-Wunknown-sanitizers]
irqentry_state_t noinstr irqentry_enter(struct pt_regs *regs);
^
include/linux/compiler_types.h:213:35: note: expanded from macro 'noinstr'
__no_kcsan __no_sanitize_address __no_sanitize_coverage
^
include/linux/compiler-clang.h:49:59: note: expanded from macro '__no_sanitize_coverage'
#define __no_sanitize_coverage __attribute__((no_sanitize("coverage")))
^
In file included from arch/s390/kernel/syscall.c:34:
include/linux/entry-common.h:476:6: warning: unknown sanitizer 'coverage' ignored [-Wunknown-sanitizers]
void noinstr irqentry_exit(struct pt_regs *regs, irqentry_state_t state);
^
include/linux/compiler_types.h:213:35: note: expanded from macro 'noinstr'
__no_kcsan __no_sanitize_address __no_sanitize_coverage
^
include/linux/compiler-clang.h:49:59: note: expanded from macro '__no_sanitize_coverage'
#define __no_sanitize_coverage __attribute__((no_sanitize("coverage")))
^
In file included from arch/s390/kernel/syscall.c:34:
include/linux/entry-common.h:484:18: warning: unknown sanitizer 'coverage' ignored [-Wunknown-sanitizers]
irqentry_state_t noinstr irqentry_nmi_enter(struct pt_regs *regs);
^
include/linux/compiler_types.h:213:35: note: expanded from macro 'noinstr'
__no_kcsan __no_sanitize_address __no_sanitize_coverage
^
include/linux/compiler-clang.h:49:59: note: expanded from macro '__no_sanitize_coverage'
#define __no_sanitize_coverage __attribute__((no_sanitize("coverage")))
^
In file included from arch/s390/kernel/syscall.c:34:
include/linux/entry-common.h:495:6: warning: unknown sanitizer 'coverage' ignored [-Wunknown-sanitizers]
void noinstr irqentry_nmi_exit(struct pt_regs *regs, irqentry_state_t irq_state);
^
include/linux/compiler_types.h:213:35: note: expanded from macro 'noinstr'
__no_kcsan __no_sanitize_address __no_sanitize_coverage
^
include/linux/compiler-clang.h:49:59: note: expanded from macro '__no_sanitize_coverage'
#define __no_sanitize_coverage __attribute__((no_sanitize("coverage")))
^
>> arch/s390/kernel/syscall.c:143:6: warning: unknown sanitizer 'coverage' ignored [-Wunknown-sanitizers]
void noinstr __do_syscall(struct pt_regs *regs, int per_trap)
^
include/linux/compiler_types.h:213:35: note: expanded from macro 'noinstr'
__no_kcsan __no_sanitize_address __no_sanitize_coverage
^
include/linux/compiler-clang.h:49:59: note: expanded from macro '__no_sanitize_coverage'
#define __no_sanitize_coverage __attribute__((no_sanitize("coverage")))
^
17 warnings generated.
--
In file included from arch/s390/kernel/nmi.c:33:
In file included from include/linux/kvm_host.h:33:
In file included from include/linux/kvm_para.h:5:
In file included from include/uapi/linux/kvm_para.h:36:
In file included from arch/s390/include/asm/kvm_para.h:25:
In file included from arch/s390/include/asm/diag.h:12:
In file included from include/linux/if_ether.h:19:
In file included from include/linux/skbuff.h:31:
In file included from include/linux/dma-mapping.h:10:
In file included from include/linux/scatterlist.h:9:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:464:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __raw_readb(PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:36:59: note: expanded from macro '__le16_to_cpu'
#define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
^
include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
#define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
^
In file included from arch/s390/kernel/nmi.c:33:
In file included from include/linux/kvm_host.h:33:
In file included from include/linux/kvm_para.h:5:
In file included from include/uapi/linux/kvm_para.h:36:
In file included from arch/s390/include/asm/kvm_para.h:25:
In file included from arch/s390/include/asm/diag.h:12:
In file included from include/linux/if_ether.h:19:
In file included from include/linux/skbuff.h:31:
In file included from include/linux/dma-mapping.h:10:
In file included from include/linux/scatterlist.h:9:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu'
#define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
^
include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
#define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
^
In file included from arch/s390/kernel/nmi.c:33:
In file included from include/linux/kvm_host.h:33:
In file included from include/linux/kvm_para.h:5:
In file included from include/uapi/linux/kvm_para.h:36:
In file included from arch/s390/include/asm/kvm_para.h:25:
In file included from arch/s390/include/asm/diag.h:12:
In file included from include/linux/if_ether.h:19:
In file included from include/linux/skbuff.h:31:
In file included from include/linux/dma-mapping.h:10:
In file included from include/linux/scatterlist.h:9:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writeb(value, PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:609:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:617:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:625:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:634:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:643:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
>> arch/s390/kernel/nmi.c:182:6: warning: unknown sanitizer 'coverage' ignored [-Wunknown-sanitizers]
void noinstr s390_handle_mcck(void)
^
include/linux/compiler_types.h:213:35: note: expanded from macro 'noinstr'
__no_kcsan __no_sanitize_address __no_sanitize_coverage
^
include/linux/compiler-clang.h:49:59: note: expanded from macro '__no_sanitize_coverage'
#define __no_sanitize_coverage __attribute__((no_sanitize("coverage")))
^
13 warnings generated.
..

vim +/coverage +299 arch/s390/kernel/traps.c

6f8daa2953ecd1 Heiko Carstens 2021-04-07 298
56e62a73702836 Sven Schnelle 2020-11-21 @299 void noinstr __do_pgm_check(struct pt_regs *regs)
56e62a73702836 Sven Schnelle 2020-11-21 300 {
56e62a73702836 Sven Schnelle 2020-11-21 301 unsigned long last_break = S390_lowcore.breaking_event_addr;
56e62a73702836 Sven Schnelle 2020-11-21 302 unsigned int trapnr, syscall_redirect = 0;
56e62a73702836 Sven Schnelle 2020-11-21 303 irqentry_state_t state;
56e62a73702836 Sven Schnelle 2020-11-21 304
bae1cd368c45d1 Sven Schnelle 2021-04-29 305 add_random_kstack_offset();
56e62a73702836 Sven Schnelle 2020-11-21 306 regs->int_code = *(u32 *)&S390_lowcore.pgm_ilc;
56e62a73702836 Sven Schnelle 2020-11-21 307 regs->int_parm_long = S390_lowcore.trans_exc_code;
56e62a73702836 Sven Schnelle 2020-11-21 308
56e62a73702836 Sven Schnelle 2020-11-21 309 state = irqentry_enter(regs);
56e62a73702836 Sven Schnelle 2020-11-21 310
56e62a73702836 Sven Schnelle 2020-11-21 311 if (user_mode(regs)) {
56e62a73702836 Sven Schnelle 2020-11-21 312 update_timer_sys();
56e62a73702836 Sven Schnelle 2020-11-21 313 if (last_break < 4096)
56e62a73702836 Sven Schnelle 2020-11-21 314 last_break = 1;
56e62a73702836 Sven Schnelle 2020-11-21 315 current->thread.last_break = last_break;
56e62a73702836 Sven Schnelle 2020-11-21 316 regs->args[0] = last_break;
56e62a73702836 Sven Schnelle 2020-11-21 317 }
56e62a73702836 Sven Schnelle 2020-11-21 318
56e62a73702836 Sven Schnelle 2020-11-21 319 if (S390_lowcore.pgm_code & 0x0200) {
56e62a73702836 Sven Schnelle 2020-11-21 320 /* transaction abort */
56e62a73702836 Sven Schnelle 2020-11-21 321 memcpy(&current->thread.trap_tdb, &S390_lowcore.pgm_tdb, 256);
56e62a73702836 Sven Schnelle 2020-11-21 322 }
56e62a73702836 Sven Schnelle 2020-11-21 323
56e62a73702836 Sven Schnelle 2020-11-21 324 if (S390_lowcore.pgm_code & PGM_INT_CODE_PER) {
56e62a73702836 Sven Schnelle 2020-11-21 325 if (user_mode(regs)) {
56e62a73702836 Sven Schnelle 2020-11-21 326 struct per_event *ev = &current->thread.per_event;
56e62a73702836 Sven Schnelle 2020-11-21 327
56e62a73702836 Sven Schnelle 2020-11-21 328 set_thread_flag(TIF_PER_TRAP);
56e62a73702836 Sven Schnelle 2020-11-21 329 ev->address = S390_lowcore.per_address;
56e62a73702836 Sven Schnelle 2020-11-21 330 ev->cause = *(u16 *)&S390_lowcore.per_code;
56e62a73702836 Sven Schnelle 2020-11-21 331 ev->paid = S390_lowcore.per_access_id;
56e62a73702836 Sven Schnelle 2020-11-21 332 } else {
56e62a73702836 Sven Schnelle 2020-11-21 333 /* PER event in kernel is kprobes */
56e62a73702836 Sven Schnelle 2020-11-21 334 __arch_local_irq_ssm(regs->psw.mask & ~PSW_MASK_PER);
56e62a73702836 Sven Schnelle 2020-11-21 335 do_per_trap(regs);
56e62a73702836 Sven Schnelle 2020-11-21 336 goto out;
56e62a73702836 Sven Schnelle 2020-11-21 337 }
56e62a73702836 Sven Schnelle 2020-11-21 338 }
56e62a73702836 Sven Schnelle 2020-11-21 339
56e62a73702836 Sven Schnelle 2020-11-21 340 if (!irqs_disabled_flags(regs->psw.mask))
56e62a73702836 Sven Schnelle 2020-11-21 341 trace_hardirqs_on();
56e62a73702836 Sven Schnelle 2020-11-21 342 __arch_local_irq_ssm(regs->psw.mask & ~PSW_MASK_PER);
56e62a73702836 Sven Schnelle 2020-11-21 343
56e62a73702836 Sven Schnelle 2020-11-21 344 trapnr = regs->int_code & PGM_INT_CODE_MASK;
56e62a73702836 Sven Schnelle 2020-11-21 345 if (trapnr)
56e62a73702836 Sven Schnelle 2020-11-21 346 pgm_check_table[trapnr](regs);
56e62a73702836 Sven Schnelle 2020-11-21 347 syscall_redirect = user_mode(regs) && test_pt_regs_flag(regs, PIF_SYSCALL);
56e62a73702836 Sven Schnelle 2020-11-21 348 out:
56e62a73702836 Sven Schnelle 2020-11-21 349 local_irq_disable();
56e62a73702836 Sven Schnelle 2020-11-21 350 irqentry_exit(regs, state);
56e62a73702836 Sven Schnelle 2020-11-21 351
56e62a73702836 Sven Schnelle 2020-11-21 352 if (syscall_redirect) {
56e62a73702836 Sven Schnelle 2020-11-21 353 enter_from_user_mode(regs);
56e62a73702836 Sven Schnelle 2020-11-21 354 local_irq_enable();
56e62a73702836 Sven Schnelle 2020-11-21 355 regs->orig_gpr2 = regs->gprs[2];
56e62a73702836 Sven Schnelle 2020-11-21 356 do_syscall(regs);
56e62a73702836 Sven Schnelle 2020-11-21 357 exit_to_user_mode();
56e62a73702836 Sven Schnelle 2020-11-21 358 }
56e62a73702836 Sven Schnelle 2020-11-21 359 }
6f8daa2953ecd1 Heiko Carstens 2021-04-07 360

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0-DAY CI Kernel Test Service, Intel Corporation
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