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    SubjectRe: [PATCH 1/3] build system: section garbage collection for vmlinux
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    On Wednesday 05 September 2007 21:07, Sam Ravnborg wrote:
    > On Wed, Sep 05, 2007 at 02:47:00PM +0100, Denys Vlasenko wrote:
    > > On Wednesday 05 September 2007 14:43, Denys Vlasenko wrote:
    > > > These patches fix section names and add
    > > > CONFIG_DISCARD_UNUSED_SECTIONS. It is not enabled
    > > > unconditionally because only newest binutils have
    > > > ld --gc-sections which is stable enough for kernel use.
    > > > IOW: this is an experimental feature for now.
    > >
    > > Part 1: fix section names over entire source (all arches).
    > >
    > > Patch is big and boring global s/.text.lock/.text_lock/
    > > type thing.
    >
    > The normal naming scheme seems to be:
    > .<usage>.text so in your example it would be: .lock.text
    > See the naming of init and exit sections (that was renamed
    > during 2.5 to be compatible with -ffunction-sections).

    Well, there seems to be a problem at least with .bss:

    http://sourceware.org/bugzilla/show_bug.cgi?id=5006

    With __attribute__((section(".bss.page_aligned")))
    gcc will produce .bss.page_aligned section
    with NOBITS attribute, purely on the basis
    of section name starting by '.bss.'

    With __attribute__((section(".bss_page_aligned"))),
    section will get PROGBITS attribute instead.

    Combining NOBITS and PROGBITS sections into one .bss
    section is not funny.

    IOW: at least for bss, we _must_ use ".bss.xxx" names.

    I propose (and will implement in next round of patches)
    .bss.k.page_aligned ('k' for 'kernel').

    Lickily, we alctually have only one special bss section
    on kernel today.

    Sam, my question - should I also do the same for text/rodata/data,
    just for paranoid reasons?
    --
    vda
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