[ARM] 2941/1: Fix running legacy binaries from a soft-float root filesystem with...

Patch from Daniel Jacobowitz

Thread flags are inherited on fork().  In order for a binary which has
the iWMMXt coprocessor enabled to run a binary which needs the FPA
emulation, we need to explicitly clear TIF_USING_IWMMXT if we are not
going to set it.

Signed-off-by: Daniel Jacobowitz <dan@codesourcery.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/include/asm-arm/elf.h b/include/asm-arm/elf.h
index a1696ba238d3aad1c891f194ac93d8c0b73c1362..7da97a937548afd05a977ceb0d2148821dc05cfb 100644 (file)
--- a/include/asm-arm/elf.h
+++ b/include/asm-arm/elf.h
@@ -124,6 +124,8 @@ do { \
        if (((ex).e_flags & EF_ARM_EABI_MASK) || \
            ((ex).e_flags & EF_ARM_SOFT_FLOAT)) \
                set_thread_flag(TIF_USING_IWMMXT); \
+       else \
+               clear_thread_flag(TIF_USING_IWMMXT); \
 } while (0)
 
 #endif