From: "Andrew Morton" <andrewm@uow.edu.au>
>
> [morton@victoria net]$ strings Space.o
> eip: %p
> /usr/src/linux/include/asm/spinlock.h
> kernel BUG at %s:%d!
> /usr/src/linux/include/asm/spinlock.h
> kernel BUG at %s:%d!
It's worse: even without -fwritable-stings, gcc doesn't merge identical
strings properly: these strings appears 100 times in my vmlinux file.
I removed the printk from BUG, and that saved ~ 60 kB data area. I don't
know how much we could save if _all_ identical strings get merged.
Does anyone know how gcc+ld merge identical strings, and if that works if an
identical string appears in different files?
IIRC MSVC creates a special symbol for each string with an automatic name:
the mangled contents of the string.
The linker then merges the identically named symbols.
I think the linker should support that [required for certain static inline
tricks], but I don't know know if gcc uses that feature.
Btw, IIRC someone proposed to mark the .rodata section as read-only: that
won't work because the complete kernel is mapped with 4 MB pte's :-(
--
<amfred
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This archive was generated by hypermail 2b29 : Thu Mar 23 2000 - 21:00:33 EST