[PATCH 02/10] ARM: unexport symbols used to implement floating point emulation

From: Alan Jenkins
Date: Tue Nov 03 2009 - 05:08:03 EST

The Kconfigs for in-tree floating point emulation do not allow building
as modules. That leaves the Acorn FPEmulator module. I found two public
releases of this as a binary module for 2.1 and 2.2 kernels, optimized
for ARMV4.[1] If there is a resurgence of interest in this, the symbols
can always be re-exported.

This allows the EXPORT_SYMBOL_ALIAS() hack to be removed. The ulterior
motive here is that EXPORT_SYMBOL_ALIAS() makes it harder to sort the
resulting kernel symbol tables. Sorted symbol tables will allow faster
symbol resolution during module loading.

Note that fp_send_sigs() and fp_printk() are simply aliases for existing
exports and add no obvious value. Similarly fp_enter could easily be
renamed to kern_fp_enter at the point of definition. Therefore removing
EXPORT_SYMBOL_ALIAS will not serve as a material obstacle to re-adding
the exports should they be desired in future.

Build tested only.

[1] http://ftp.arm.linux.org.uk/pub/linux/arm/fpemulator/

Signed-off-by: Alan Jenkins <alan-jenkins@xxxxxxxxxxxxxx>
CC: Russell King <linux@xxxxxxxxxxxxxxxx>
arch/arm/kernel/armksyms.c | 20 --------------------
1 files changed, 0 insertions(+), 20 deletions(-)

diff --git a/arch/arm/kernel/armksyms.c b/arch/arm/kernel/armksyms.c
index 0e62770..8214bfe 100644
--- a/arch/arm/kernel/armksyms.c
+++ b/arch/arm/kernel/armksyms.c
@@ -48,27 +48,7 @@ extern void __aeabi_uidivmod(void);
extern void __aeabi_ulcmp(void);

extern void fpundefinstr(void);
-extern void fp_enter(void);

- * This has a special calling convention; it doesn't
- * modify any of the usual registers, except for LR.
- */
-#define EXPORT_CRC_ALIAS(sym) __CRC_SYMBOL(sym, "")
-#define EXPORT_SYMBOL_ALIAS(sym,orig) \
- static const struct kernel_symbol __ksymtab_##sym \
- __used __attribute__((section("__ksymtab"))) = \
- { (unsigned long)&orig, #sym };
- * floating point math emulator support.
- * These symbols will never change their calling convention...
- */



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