Messages in this thread |  | | Date | Fri, 18 Jan 2002 22:18:53 +0100 | From | Pavel Machek <> | Subject | Re: [PATCH] 1-2-3 GB |
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Hi!
> The patch below seems to be enough to convince egcs-2.91.66 and > gcc-2.95.3 to use a "jb" comparison there. I'm working on PIII, > prefetchw() just a stub, if that makes any difference.
If this is really gcc bug, would simply making j volatile fix it?
Pavel > --- 2.4.18pre2aa2/mm/memory.c Sat Jan 12 18:01:36 2002 > +++ linux/mm/memory.c Sat Jan 12 18:09:27 2002 > @@ -106,8 +106,7 @@ > > static inline void free_one_pgd(pgd_t * dir) > { > - int j; > - pmd_t * pmd; > + pmd_t * pmd, * md, * emd; > > if (pgd_none(*dir)) > return; > @@ -118,9 +117,9 @@ > } > pmd = pmd_offset(dir, 0); > pgd_clear(dir); > - for (j = 0; j < PTRS_PER_PMD ; j++) { > - prefetchw(pmd+j+(PREFETCH_STRIDE/16)); > - free_one_pmd(pmd+j); > + for (md = pmd, emd = pmd + PTRS_PER_PMD; md < emd; md++) { > + prefetchw(md+(PREFETCH_STRIDE/16)); > + free_one_pmd(md); > } > pmd_free(pmd); > }
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