[PATCH v4 3/3] modversions: treat symbol CRCs as 32 bit quantities on 64 bit archs
Linus Torvalds
torvalds at linux-foundation.org
Thu Jan 19 11:15:14 AEDT 2017
On Wed, Jan 18, 2017 at 2:37 PM, Ard Biesheuvel
<ard.biesheuvel at linaro.org> wrote:
>
> For a ballpark number of 10,000 CRCs in the core kernel, this would
> increase the size of the image by 40 KB for 32-bit architectures (and
> if saving 40 KB is essential, chances are you won't be using
> modversions in the first place).
As you say, I don't think the space issue is much of a problem.
I'm more worried about the replacement of one crazy model that has
problems due to linker subtlety with _another_ one.
Your genksyms.c change is not exactly obvious. I looked at it, and my
brain just shut down. Why both the
LONG(0x%08lx);
_and_ the
"%s__crc_%s = 0x%08lx;\n"
in the linker script? I'm sure there's a good reason, but I'd like to
see a more explicit explanation fo what the generated linker script
does and what the rules are.
Linus
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