linux-kernel - [PATCH 9/9] module: remove the SHF_ALLOC flag on the _

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Date:	Sat, 07 Feb 2009 23:15:22 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	linux-kernel@...r.kernel.org
Cc:	Shawn Bohrer <shawn.bohrer@...il.com>
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@...il.com>
Signed-off-by: Rusty Russell <rusty@...tcorp.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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