Messages in this thread Patch in this message | | | From | Jeremy Fitzhardinge <> | Subject | [PATCH RFC 5/8] mips/jump_label: add arch_jump_label_transform_early() | Date | Thu, 29 Sep 2011 16:26:35 -0700 |
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From: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
This allows jump-label entries to be modified early, in a pre-SMP environment.
XXX TODO: make sure idling CPUs flush their icaches before continuing in case this modifies something that's adjacent to their init-idle loops.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: David Daney <david.daney@cavium.com> --- arch/mips/kernel/jump_label.c | 21 +++++++++++++++++---- 1 files changed, 17 insertions(+), 4 deletions(-)
diff --git a/arch/mips/kernel/jump_label.c b/arch/mips/kernel/jump_label.c index 6001610..ddc9a65 100644 --- a/arch/mips/kernel/jump_label.c +++ b/arch/mips/kernel/jump_label.c @@ -20,8 +20,8 @@ #define J_RANGE_MASK ((1ul << 28) - 1) -void arch_jump_label_transform(struct jump_entry *e, - enum jump_label_type type) +static void __jump_label_transform(struct jump_entry *e, + enum jump_label_type type) { union mips_instruction insn; union mips_instruction *insn_p = @@ -40,15 +40,28 @@ void arch_jump_label_transform(struct jump_entry *e, insn.word = 0; /* nop */ } - get_online_cpus(); - mutex_lock(&text_mutex); *insn_p = insn; flush_icache_range((unsigned long)insn_p, (unsigned long)insn_p + sizeof(*insn_p)); +} + +void arch_jump_label_transform(struct jump_entry *e, + enum jump_label_type type) +{ + get_online_cpus(); + mutex_lock(&text_mutex); + + __jump_label_tranform(e, type); mutex_unlock(&text_mutex); put_online_cpus(); } +void __init arch_jump_label_transform_early(struct jump_entry *e, + enum jump_label_type type) +{ + __jump_label_tranform(e, type); +} + #endif /* HAVE_JUMP_LABEL */ -- 1.7.6.2
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