Messages in this thread |  | | | Date | Wed, 26 May 2010 16:33:34 +0900 | | From | Paul Mundt <> | | Subject | Re: [PATCH] FLAT: allow arches to declare a larger alignment than the slab |
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On Wed, May 26, 2010 at 03:23:02AM -0400, Mike Frysinger wrote: > On Wed, May 26, 2010 at 02:59, Geert Uytterhoeven wrote: > > From looking at <linux/flat.h>, it looks like the FLAT binary format > > doesn't contain any > > alignment information? So if I put __attribute__((aligned(4096))) in a > > file, there's still > > no guarantee it will actually be in memory at a 4Ki-aligned address? > > i believe that is correct. FLAT behavior today provides alignment of > either sizeof(unsigned long) or ARCH_SLAB_MINALIGN. > > i imagine something like this would work today because everyone > defines it to a constant: > -#ifdef ARCH_SLAB_MINALIGN > +#if defined(ARCH_SLAB_MINALIGN) && ARCH_SLAB_MINALIGN != 0 > but this would break if someone tried using gcc sizeof/alignof/etc...
alignof is used by SLUB/SLOB to set the ARCH_SLAB_MINALIGN value if the architecture hasn't already specified one, so that wouldn't work.
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