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>

1 files changed, 3 insertions, 0 deletions

diff --git a/kernel/module.c b/kernel/module.c
index 599fc85bd2cc..784bf6d8f8c4 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1961,6 +1961,9 @@ static noinline struct module *load_module(void __user *umod,
                 if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0)
                         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,