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| author | Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> | 2014-04-24 23:56:43 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2014-04-25 13:07:33 +0200 |
| commit | 7d0656598924b2781fb96cdff566c9f844643fcd (patch) | |
| tree | a47f983783b2cce7d72666715e7509edf3262c79 /arch/arm/kernel/pj4-cp0.c | |
| parent | ARM: 8038/1: iwmmxt: explicitly check for supported architectures (diff) | |
| download | linux-7d0656598924b2781fb96cdff566c9f844643fcd.tar.xz linux-7d0656598924b2781fb96cdff566c9f844643fcd.zip | |
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>
Diffstat (limited to 'arch/arm/kernel/pj4-cp0.c')
| -rw-r--r-- | arch/arm/kernel/pj4-cp0.c | 8 |
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; } |