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FromRusty Russell <>
DateSat, 07 Feb 2009 23:15:22 +1030
Subject[PATCH 9/9] module: remove the SHF_ALLOC flag on the __versions section.

Impact: reduce kernel memory usage

This patch just takes off the SHF_ALLOC flag on __versions so we don't
keep them around after module load.

This saves about 7% of module memory if CONFIG_MODVERSIONS=y.

Cc: Shawn Bohrer <shawn.bohrer@gmail.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---
kernel/module.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/kernel/module.c b/kernel/module.c
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1928,6 +1928,9 @@ static noinline struct module *load_modu
if (strstarts(secstrings+sechdrs[i].sh_name, ".exit"))
sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
#endif
+ /* Don't keep __versions around; it's just for loading. */
+ if (strcmp(secstrings + sechdrs[i].sh_name, "__versions") == 0)
+ sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
}

modindex = find_sec(hdr, sechdrs, secstrings,


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