Date: Mon, 11 Apr 2005 20:03:24 +0400 From: Vladislav Shabanov <vs@rambler-co.ru> To: hackers@freebsd.org Subject: do-nothing code in sysv_shm.c Message-ID: <200504112003.25096.vs@rambler-co.ru>
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I`ve found the following code in sysv_shm.c : ............ static void shminit() { int i; TUNABLE_INT_FETCH("kern.ipc.shmmaxpgs", &shminfo.shmall); for (i = PAGE_SIZE; i > 0; i--) { shminfo.shmmax = shminfo.shmall * PAGE_SIZE; if (shminfo.shmmax >= shminfo.shmall) break; } TUNABLE_INT_FETCH("kern.ipc.shmmin", &shminfo.shmmin); ......... IMHO, loop does nothing. Possible variant: #define shmall_bits (sizeof(shminfo.shmall)*8) if (0 == (shminfo.shmall & (~ ( (1<<(shmall_bits-PAGE_SHIFT-1)) - 1)))) { /* if high PAGE_SHIFT+1 bits of shminfo.shmall is zero */ shminfo.shmmax = shminfo.shmall << PAGE_SHIFT; } else { shminfo.shmmax = __INT_MAX; } ------------------------------ previous changes in this part of code: http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/kern/sysv_shm.c.diff?r1=1.78&r2=1.79&f=h http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/kern/sysv_shm.c.diff?r1=1.79&r2=1.80&f=h
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