linux-kernel - [PATCH v3] uselib: default depending if libc5 was used

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Date:	Tue,  1 Dec 2015 16:08:57 +0200
From:	Riku Voipio <riku.voipio@...aro.org>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, Riku Voipio <riku.voipio@...aro.org>,
	Josh Triplett <josh@...htriplett.org>
Subject: [PATCH v3] uselib: default depending if libc5 was used

uselib hasn't been used since libc5; glibc does not use it.
Deprecate uselib a bit more, by making the default y only
if libc5 was widely used on the plaform.

This makes arm64 kernel built with defconfig slightly smaller

bloat-o-meter:
add/remove: 0/3 grow/shrink: 0/2 up/down: 0/-1390 (-1390)
function                                     old     new   delta
kernel_config_data                         18164   18162      -2
uselib_flags                                  20       -     -20
padzero                                      216     192     -24
sys_uselib                                   380       -    -380
load_elf_library                             964       -    -964

Signed-off-by: Riku Voipio <riku.voipio@...aro.org>
Cc: Josh Triplett <josh@...htriplett.org>
---
v3: only depend on IA32_EMULATION to catch X86_64 with 32bit case
v2: Disable uselib on X86_64 if no 32bit support
 init/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/init/Kconfig b/init/Kconfig
index c24b6f7..5a7f375 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -285,7 +285,7 @@ config FHANDLE
 
 config USELIB
 	bool "uselib syscall"
-	default y
+	def_bool ALPHA || M68K || SPARC || X86_32 || IA32_EMULATION
 	help
 	  This option enables the uselib syscall, a system call used in the
 	  dynamic linker from libc5 and earlier.  glibc does not use this
-- 
2.6.2

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