parisc: fix personality on 32bit kernel

Process personality is stored together with other flags like UNAME26 in
an integer variable. Overwriting this value with PER_LINUX drops all
other existing flags and as such broke tools like the uname26 tool.

Actually this was only broken on 32bit kernels, since for 32bit-ELF
binaries on 64-bit kernels the SET_PERSONALITY macro from
arch/parisc/kernel/binfmt_elf32.c is used which does not modifies the
personality value at all (which is wrong as long as we don't run HPUX
binaries or similiar).

Signed-off-by: Helge Deller <[e-mail]>

arch/parisc/include/asm/elf.h

···
 #define ELF_PLATFORM  ("PARISC\0")
 
 #define SET_PERSONALITY(ex) \
-	current->personality = PER_LINUX; \
+	set_personality((current->personality & ~PER_MASK) | PER_LINUX); \
 	current->thread.map_base = DEFAULT_MAP_BASE; \
 	current->thread.task_size = DEFAULT_TASK_SIZE \