diff options
| author | Andy Lutomirski <luto@amacapital.net> | 2014-06-18 15:59:49 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2014-06-19 15:45:26 -0700 |
| commit | 0e3727a8839c988a3c56170bc8da76d55a16acad (patch) | |
| tree | bfecd620ea122be019fdf446d4c716244838fdfd /arch/x86/vdso/vdso2c.h | |
| parent | bfad381c0d1e19cae8461e105d8d4387dd2a14fe (diff) | |
x86/vdso: Remove some redundant in-memory section headers
.data doesn't need to be separate from .rodata: they're both readonly.
.altinstructions and .altinstr_replacement aren't needed by anything
except vdso2c; strip them from the final image.
While we're at it, rather than aligning the actual executable text,
just shove some unused-at-runtime data in between real data and
text.
My vdso image is still above 4k, but I'm disinclined to try to
trim it harder for 3.16. For future trimming, I suspect that these
sections could be moved to later in the file and dropped from
the in-memory image:
.gnu.version and .gnu.version_d (this may lose versions in gdb)
.eh_frame (should be harmless)
.eh_frame_hdr (I'm not really sure)
.hash (AFAIK nothing needs this section header)
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Link: http://lkml.kernel.org/r/2e96d0c49016ea6d026a614ae645e93edd325961.1403129369.git.luto@amacapital.net
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/vdso/vdso2c.h')
| -rw-r--r-- | arch/x86/vdso/vdso2c.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/x86/vdso/vdso2c.h b/arch/x86/vdso/vdso2c.h index f01ed4bde88..f42e2ddc663 100644 --- a/arch/x86/vdso/vdso2c.h +++ b/arch/x86/vdso/vdso2c.h @@ -92,7 +92,9 @@ static void BITSFUNC(copy_section)(struct BITSFUNC(fake_sections) *out, { uint64_t flags = GET_LE(&in->sh_flags); - bool copy = flags & SHF_ALLOC; + bool copy = flags & SHF_ALLOC && + strcmp(name, ".altinstructions") && + strcmp(name, ".altinstr_replacement"); if (!copy) return; |