[PATCH] sysinfo fix

From: Erik Andersen (andersen@codepoet.org)
Date: Tue Aug 29 2000 - 01:21:22 EST


On Mon Aug 28, 2000 at 06:11:09PM -0700, Linus Torvalds wrote:
>
> people who want a patch into the kernel should just check whether it made
> it, and re-send if not.

<patch resend alert>

This fixes sysinfo so it is binary compatable with 2.2.x kernels (for the
0-4Gib range), while retaining compatability with earlier 2.[34].x kernels.

Please consider for inclusion,

 -Erik

--
Erik B. Andersen   email:  andersee@debian.org
--This message was written using 73% post-consumer electrons--

--- linux-2.4.0-test6.virgin/kernel/info.c Mon Aug 23 12:15:53 1999 +++ linux/kernel/info.c Mon Aug 21 11:03:14 2000 @@ -32,6 +32,42 @@ si_meminfo(&val); si_swapinfo(&val); + { + /* If the sum of all the available memory (i.e. ram + swap + + * highmem) is less then can be stored in a 32 bit unsigned long + * then we can be binary compatable with 2.2.x kernels. If not, + * well, who cares since in that case 2.2.x was broken anyways... + * + * -Erik Andersen <andersee@debian.org> */ + + unsigned long mem_total = val.totalram + val.totalswap; + if ( !(mem_total < val.totalram || mem_total < val.totalswap)) { + unsigned long mem_total2 = mem_total + val.totalhigh; + if (!(mem_total2 < mem_total || mem_total2 < val.totalhigh)) + { + /* If mem_total did not overflow. Divide all memory values by + * mem_unit and set mem_unit=1. This leaves things compatable with + * 2.2.x, and also retains compatability with earlier 2.4.x + * kernels... */ + + int bitcount = 0; + while (val.mem_unit > 1) + { + bitcount++; + val.mem_unit >>= 1; + } + val.totalram <<= bitcount; + val.freeram <<= bitcount; + val.sharedram <<= bitcount; + val.bufferram <<= bitcount; + val.totalswap <<= bitcount; + val.freeswap <<= bitcount; + val.totalhigh <<= bitcount; + val.freehigh <<= bitcount; + } + } + } + if (copy_to_user(info, &val, sizeof(struct sysinfo))) return -EFAULT; return 0; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/



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