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Linux 2.2 non-SMP on SMP Alpha needed this

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This commit is contained in:
albert 2004-08-10 07:18:04 +00:00
parent 1e1ec4ad84
commit 792358ba42
1 changed files with 9 additions and 5 deletions
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14
proc/sysinfo.c
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@ -191,16 +191,20 @@ static unsigned long find_elf_note(unsigned long findme){
static void init_libproc(void) __attribute__((constructor));
static void init_libproc(void){
/* ought to count CPUs in /proc/stat instead of relying
* on glibc, which foolishly tries to parse /proc/cpuinfo
*/
smp_num_cpus = sysconf(_SC_NPROCESSORS_CONF); // or _SC_NPROCESSORS_ONLN
// ought to count CPUs in /proc/stat instead of relying
// on glibc, which foolishly tries to parse /proc/cpuinfo
//
// SourceForge has an old Alpha running Linux 2.2.20 that
// appears to have a non-SMP kernel on a 2-way SMP box.
// _SC_NPROCESSORS_CONF returns 2, resulting in HZ=512
// _SC_NPROCESSORS_ONLN returns 1, which should work OK
smp_num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
if(smp_num_cpus<1) smp_num_cpus=1; /* SPARC glibc is buggy */
if(linux_version_code > LINUX_VERSION(2, 4, 0)){
Hertz = find_elf_note(AT_CLKTCK);
if(Hertz!=NOTE_NOT_FOUND) return;
fprintf(stderr, "2.4 kernel w/o ELF notes? -- report to albert@users.sf.net\n");
fprintf(stderr, "2.4 kernel w/o ELF notes? -- report this\n");
}
old_Hertz_hack();
}