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He demonstrated it with the following test:\n\n # cd /sys/kernel/tracing\n # while [ 1 ]; do x=1; done &\n # echo '__schedule_bug:traceon' > set_ftrace_filter\n # time echo '!__schedule_bug:traceon' > set_ftrace_filter;\n\nreal\t0m1.064s\nuser\t0m0.000s\nsys\t0m0.004s\n\nWhere it takes a little over a second to perform the synchronize,\nbecause there's a loop that waits 1 second at a time for tasks to get\nthrough their quiescent points when there's a task that must be waited\nfor.\n\nAfter discussion we came up with a simple way to wait for holdouts but\nincrease the time for each iteration of the loop but no more than a\nfull second.\n\nWith the new patch we have:\n\n # time echo '!__schedule_bug:traceon' > set_ftrace_filter;\n\nreal\t0m0.131s\nuser\t0m0.000s\nsys\t0m0.004s\n\nWhich drops it down to 13% of what the original wait time was.\n\nLink: http://lkml.kernel.org/r/20180523063815.198302-2-joel@joelfernandes.org\nReported-by: Joel Fernandes (Google) <joel@joelfernandes.org>\nSuggested-by: Joel Fernandes (Google) <joel@joelfernandes.org>\nSigned-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>\nSigned-off-by: Paul E. 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However, the pointer passed to the constraint is a\npointer to unsigned long, and thus the hazard only applies to the first\n8 bytes of the location.\n\nGCC can take advantage of this, assuming that other portions of the\nlocation are unchanged, leading to a number of potential problems.\n\nThis is similar to what we fixed back in commit:\n\n  fee960bed5e857eb (\"arm64: xchg: hazard against entire exchange variable\")\n\n... but we forgot to adjust cmpxchg_double*() similarly at the same\ntime.\n\nThe same problem applies, as demonstrated with the following test:\n\n| struct big {\n|         u64 lo, hi;\n| } __aligned(128);\n|\n| unsigned long foo(struct big *b)\n| {\n|         u64 hi_old, hi_new;\n|\n|         hi_old = b->hi;\n|         cmpxchg_double_local(&b->lo, &b->hi, 0x12, 0x34, 0x56, 0x78);\n|         hi_new = b->hi;\n|\n|         return hi_old ^ hi_new;\n| }\n\n... which GCC 12.1.0 compiles as:\n\n| 0000000000000000 <foo>:\n|    0:   d503233f        paciasp\n|    4:   aa0003e4        mov     x4, x0\n|    8:   1400000e        b       40 <foo+0x40>\n|    c:   d2800240        mov     x0, #0x12                       // #18\n|   10:   d2800681        mov     x1, #0x34                       // #52\n|   14:   aa0003e5        mov     x5, x0\n|   18:   aa0103e6        mov     x6, x1\n|   1c:   d2800ac2        mov     x2, #0x56                       // #86\n|   20:   d2800f03        mov     x3, #0x78                       // #120\n|   24:   48207c82        casp    x0, x1, x2, x3, [x4]\n|   28:   ca050000        eor     x0, x0, x5\n|   2c:   ca060021        eor     x1, x1, x6\n|   30:   aa010000        orr     x0, x0, x1\n|   34:   d2800000        mov     x0, #0x0                        // #0    <--- BANG\n|   38:   d50323bf        autiasp\n|   3c:   d65f03c0        ret\n|   40:   d2800240        mov     x0, #0x12                       // #18\n|   44:   d2800681        mov     x1, #0x34                       // #52\n|   48:   d2800ac2        mov     x2, #0x56                       // #86\n|   4c:   d2800f03        mov     x3, #0x78                       // #120\n|   50:   f9800091        prfm    pstl1strm, [x4]\n|   54:   c87f1885        ldxp    x5, x6, [x4]\n|   58:   ca0000a5        eor     x5, x5, x0\n|   5c:   ca0100c6        eor     x6, x6, x1\n|   60:   aa0600a6        orr     x6, x5, x6\n|   64:   b5000066        cbnz    x6, 70 <foo+0x70>\n|   68:   c8250c82        stxp    w5, x2, x3, [x4]\n|   6c:   35ffff45        cbnz    w5, 54 <foo+0x54>\n|   70:   d2800000        mov     x0, #0x0                        // #0     <--- BANG\n|   74:   d50323bf        autiasp\n|   78:   d65f03c0        ret\n\nNotice that at the lines with \"BANG\" comments, GCC has assumed that the\nhigher 8 bytes are unchanged by the cmpxchg_double() call, and that\n`hi_old ^ hi_new` can be reduced to a constant zero, for both LSE and\nLL/SC versions of cmpxchg_double().\n\nThis patch fixes the issue by passing a pointer to __uint128_t into the\n+Q constraint, ensuring that the compiler hazards against the entire 16\nbytes being modified.\n\nWith this change, GCC 12.1.0 compiles the above test as:\n\n| 0000000000000000 <foo>:\n|    0:   f9400407        ldr     x7, [x0, #8]\n|    4:   d503233f        paciasp\n|    8:   aa0003e4        mov     x4, x0\n|    c:   1400000f        b       48 <foo+0x48>\n|   10:   d2800240        mov     x0, #0x12                       // #18\n|   14:   d2800681        mov     x1, #0x34                       // #52\n|   18:   aa0003e5        mov     x5, x0\n|   1c:   aa0103e6        mov     x6, x1\n|   20:   d2800ac2        mov     x2, #0x56                       // #86\n|   24:   d2800f03        mov     x3, #0x78                       // #120\n|   28:   48207c82        casp    x0, x1, x2, x3, [x4]\n|   2c:   ca050000        eor     x0, x0, x5\n|   30:   ca060021        eor     x1, x1, x6\n|   34:   aa010000        orr     x0, x0, x1\n|   38:   f9400480        ldr     x0, [x4, #8]\n|   3c:   d50323bf        autiasp\n|   40:   ca0000e0        eor     x0, x7, x0\n|   44:   d65f03c0        ret\n|   48:   d2800240        mov     x0, #0x12                       // #18\n|   4c:   d2800681        mov     x1, #0x34                       // #52\n|   50:   d2800ac2        mov     x2, #0x56                       // #86\n|   54:   d2800f03        mov     x3, #0x78                       // #120\n|   58:   f9800091        prfm    pstl1strm, [x4]\n|   5c:   c87f1885        ldxp    x5, x6, [x4]\n|   60:   ca0000a5        eor     x5, x5, x0\n|   64:   ca0100c6        eor     x6, x6, x1\n|   68:   aa0600a6        orr     x6, x5, x6\n|   6c:   b5000066        cbnz    x6, 78 <foo+0x78>\n|   70:   c8250c82        stxp    w5, x2, x3, [x4]\n|   74:   35ffff45        cbnz    w5, 5c <foo+0x5c>\n|   78:   f9400480        ldr     x0, [x4, #8]\n|   7c:   d50323bf        autiasp\n|   80:   ca0000e0        eor     x0, x7, x0\n|   84:   d65f03c0        ret\n\n... sampling the high 8 bytes before and after the cmpxchg, and\nperforming an EOR, as we'd expect.\n\nFor backporting, I've tested this atop linux-4.9.y with GCC 5.5.0. 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