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authorSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>2014-04-24 22:56:43 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2014-04-25 12:07:33 +0100
commit7d0656598924b2781fb96cdff566c9f844643fcd (patch)
treea47f983783b2cce7d72666715e7509edf3262c79
parentc2f07fe64dc0da6d4ccc02d858695356bd685aeb (diff)
downloadlinux-7d0656598924b2781fb96cdff566c9f844643fcd.tar.bz2
ARM: 8039/1: pj4: enable iWMMXt only if CONFIG_IWMMXT is set
This fixes PJ4 coprocessor init to only expose iWMMXt capabilities, if the corresponding kernel support for iWMMXt is enabled. Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Tested-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Tested-by: Kevin Hilman <khilman@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--arch/arm/kernel/pj4-cp0.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/arm/kernel/pj4-cp0.c b/arch/arm/kernel/pj4-cp0.c
index fc7208636284..12352cd30ab2 100644
--- a/arch/arm/kernel/pj4-cp0.c
+++ b/arch/arm/kernel/pj4-cp0.c
@@ -45,7 +45,7 @@ static int iwmmxt_do(struct notifier_block *self, unsigned long cmd, void *t)
return NOTIFY_DONE;
}
-static struct notifier_block iwmmxt_notifier_block = {
+static struct notifier_block __maybe_unused iwmmxt_notifier_block = {
.notifier_call = iwmmxt_do,
};
@@ -79,17 +79,21 @@ static void __init pj4_cp_access_write(u32 value)
*/
static int __init pj4_cp0_init(void)
{
- u32 cp_access;
+ u32 __maybe_unused cp_access;
if (!cpu_is_pj4())
return 0;
+#ifndef CONFIG_IWMMXT
+ pr_info("PJ4 iWMMXt coprocessor detected, but kernel support is missing.\n");
+#else
cp_access = pj4_cp_access_read() & ~0xf;
pj4_cp_access_write(cp_access);
printk(KERN_INFO "PJ4 iWMMXt coprocessor enabled.\n");
elf_hwcap |= HWCAP_IWMMXT;
thread_register_notifier(&iwmmxt_notifier_block);
+#endif
return 0;
}