[ARM] 3912/1: Make PXA270 advertise HWCAP_IWMMXT capability

ARM patch 3756/1 added HWCAP_IWMMXT.  This patch adds support
for broadcasting that info via /proc/cpuinfo and sets it for
the CPU features of the PXA270.

I've booted 19rc3 on a pxa270 and confirmed that the /proc/cpuinfo
shows "iwmmxt" in the Features.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/kernel/setup.c

@@ -357,6 +357,9 @@ static void __init setup_processor(void)
 #ifndef CONFIG_VFP
 	elf_hwcap &= ~HWCAP_VFP;
 #endif
+#ifndef CONFIG_IWMMXT
+	elf_hwcap &= ~HWCAP_IWMMXT;
+#endif
 
 	cpu_proc_init();
 }
@@ -854,6 +857,7 @@ static const char *hwcap_str[] = {
 	"vfp",
 	"edsp",
 	"java",
+	"iwmmxt",
 	NULL
 };
 

arch/arm/mm/proc-xscale.S

@@ -909,7 +909,7 @@ __pxa270_proc_info:
 	b	__xscale_setup
 	.long	cpu_arch_name
 	.long	cpu_elf_name
-	.long	HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
+	.long	HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP|HWCAP_IWMMXT
 	.long	cpu_pxa270_name
 	.long	xscale_processor_functions
 	.long	v4wbi_tlb_fns