Messages in this thread |  | | Date | Fri, 04 May 2001 09:21:26 -0400 | From | Brian Gerst <> | Subject | Re: Athlon/VIA Kernel Experimentation (mmx.c) |
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Seth Goldberg wrote: > > Hi, > > I implemented a small check loop at the end of the fast_page_copy > routine in mmx.c for the Athlon. Booting the resulting kernel > yields an interesting result. Every single time, the kernel > panics RIGHT AFTER it frees unused kernel memory from bootup. > I encourage those of you with the same problem to try this and report > when it panics. > > Here is my patch to mmx.c: (sorry about the long lines) > -----------------------------------------------------cut here > diff -r linux-ref/arch/i386/lib/mmx.c linux/arch/i386/lib/mmx.c > 204a205,216 > > > > { > > register int x = 0; > > /* do mem compares to ensure written == read */ > > for ( /* initted above */; x < (4096/sizeof(int)); x++ ) > > { > > if ( ((int *)to)[x] != ((int *)from)[x] ) { > > panic("fast_page_copy: dest value @ 0x%lx (%x) does not equal source value @ %lx (%x)!\n", > > (long) to, ((int *)to)[x], (long) from, ((int *) from)[x] ); > > } > > } > > } > -----------------------------------------------------cut here > > Wouldn't it be correct to say that because it is panicking, the > page copy was not completed properly?
No, you are comparing the following two pages... from and to are incremented as the copy proceeds. Subtract PAGE_SIZE from them before comparing.
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