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authorTejun Heo <tj@kernel.org>2009-10-29 22:34:14 +0900
committerTejun Heo <tj@kernel.org>2009-10-29 22:34:14 +0900
commit390dfd95c5df1ab3921dd388d11b2aee332c3f2c (patch)
tree8d12e22961716a0137b9e41ed00e2521b88fecce /arch
parent877105cc49f6e6ad32e3d63a214e8f537c0339ef (diff)
percpu: make misc percpu symbols unique
This patch updates misc percpu related symbols such that percpu symbols are unique and don't clash with local symbols. This serves two purposes of decreasing the possibility of global percpu symbol collision and allowing dropping per_cpu__ prefix from percpu symbols. * drivers/crypto/padlock-aes.c: s/last_cword/paes_last_cword/ * drivers/lguest/x86/core.c: s/last_cpu/lg_last_cpu/ * drivers/s390/net/netiucv.c: rename the variable used in a macro to avoid clashing with percpu symbol * arch/mn10300/kernel/kprobes.c: replace current_ prefix with cur_ for static variables. Please note that percpu symbol current_kprobe can't be changed as it's used by generic code. Partly based on Rusty Russell's "alloc_percpu: rename percpu vars which cause name clashes" patch. Signed-off-by: Tejun Heo <tj@kernel.org> Reviewed-by: Christoph Lameter <cl@linux-foundation.org> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Chuck Ebbert <cebbert@redhat.com> Cc: David Howells <dhowells@redhat.com> Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Cc: David S. Miller <davem@davemloft.net> Cc: Masami Hiramatsu <mhiramat@redhat.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: linux390@de.ibm.com
Diffstat (limited to 'arch')
-rw-r--r--arch/mn10300/kernel/kprobes.c61
1 files changed, 30 insertions, 31 deletions
diff --git a/arch/mn10300/kernel/kprobes.c b/arch/mn10300/kernel/kprobes.c
index dacafab00eb..67e6389d625 100644
--- a/arch/mn10300/kernel/kprobes.c
+++ b/arch/mn10300/kernel/kprobes.c
@@ -31,13 +31,13 @@ const int kretprobe_blacklist_size = ARRAY_SIZE(kretprobe_blacklist);
#define KPROBE_HIT_ACTIVE 0x00000001
#define KPROBE_HIT_SS 0x00000002
-static struct kprobe *current_kprobe;
-static unsigned long current_kprobe_orig_pc;
-static unsigned long current_kprobe_next_pc;
-static int current_kprobe_ss_flags;
+static struct kprobe *cur_kprobe;
+static unsigned long cur_kprobe_orig_pc;
+static unsigned long cur_kprobe_next_pc;
+static int cur_kprobe_ss_flags;
static unsigned long kprobe_status;
-static kprobe_opcode_t current_kprobe_ss_buf[MAX_INSN_SIZE + 2];
-static unsigned long current_kprobe_bp_addr;
+static kprobe_opcode_t cur_kprobe_ss_buf[MAX_INSN_SIZE + 2];
+static unsigned long cur_kprobe_bp_addr;
DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL;
@@ -399,26 +399,25 @@ void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
{
unsigned long nextpc;
- current_kprobe_orig_pc = regs->pc;
- memcpy(current_kprobe_ss_buf, &p->ainsn.insn[0], MAX_INSN_SIZE);
- regs->pc = (unsigned long) current_kprobe_ss_buf;
+ cur_kprobe_orig_pc = regs->pc;
+ memcpy(cur_kprobe_ss_buf, &p->ainsn.insn[0], MAX_INSN_SIZE);
+ regs->pc = (unsigned long) cur_kprobe_ss_buf;
- nextpc = find_nextpc(regs, &current_kprobe_ss_flags);
- if (current_kprobe_ss_flags & SINGLESTEP_PCREL)
- current_kprobe_next_pc =
- current_kprobe_orig_pc + (nextpc - regs->pc);
+ nextpc = find_nextpc(regs, &cur_kprobe_ss_flags);
+ if (cur_kprobe_ss_flags & SINGLESTEP_PCREL)
+ cur_kprobe_next_pc = cur_kprobe_orig_pc + (nextpc - regs->pc);
else
- current_kprobe_next_pc = nextpc;
+ cur_kprobe_next_pc = nextpc;
/* branching instructions need special handling */
- if (current_kprobe_ss_flags & SINGLESTEP_BRANCH)
+ if (cur_kprobe_ss_flags & SINGLESTEP_BRANCH)
nextpc = singlestep_branch_setup(regs);
- current_kprobe_bp_addr = nextpc;
+ cur_kprobe_bp_addr = nextpc;
*(u8 *) nextpc = BREAKPOINT_INSTRUCTION;
- mn10300_dcache_flush_range2((unsigned) current_kprobe_ss_buf,
- sizeof(current_kprobe_ss_buf));
+ mn10300_dcache_flush_range2((unsigned) cur_kprobe_ss_buf,
+ sizeof(cur_kprobe_ss_buf));
mn10300_icache_inv();
}
@@ -440,7 +439,7 @@ static inline int __kprobes kprobe_handler(struct pt_regs *regs)
disarm_kprobe(p, regs);
ret = 1;
} else {
- p = current_kprobe;
+ p = cur_kprobe;
if (p->break_handler && p->break_handler(p, regs))
goto ss_probe;
}
@@ -464,7 +463,7 @@ static inline int __kprobes kprobe_handler(struct pt_regs *regs)
}
kprobe_status = KPROBE_HIT_ACTIVE;
- current_kprobe = p;
+ cur_kprobe = p;
if (p->pre_handler(p, regs)) {
/* handler has already set things up, so skip ss setup */
return 1;
@@ -491,8 +490,8 @@ no_kprobe:
static void __kprobes resume_execution(struct kprobe *p, struct pt_regs *regs)
{
/* we may need to fixup regs/stack after singlestepping a call insn */
- if (current_kprobe_ss_flags & SINGLESTEP_BRANCH) {
- regs->pc = current_kprobe_orig_pc;
+ if (cur_kprobe_ss_flags & SINGLESTEP_BRANCH) {
+ regs->pc = cur_kprobe_orig_pc;
switch (p->ainsn.insn[0]) {
case 0xcd: /* CALL (d16,PC) */
*(unsigned *) regs->sp = regs->mdr = regs->pc + 5;
@@ -523,8 +522,8 @@ static void __kprobes resume_execution(struct kprobe *p, struct pt_regs *regs)
}
}
- regs->pc = current_kprobe_next_pc;
- current_kprobe_bp_addr = 0;
+ regs->pc = cur_kprobe_next_pc;
+ cur_kprobe_bp_addr = 0;
}
static inline int __kprobes post_kprobe_handler(struct pt_regs *regs)
@@ -532,10 +531,10 @@ static inline int __kprobes post_kprobe_handler(struct pt_regs *regs)
if (!kprobe_running())
return 0;
- if (current_kprobe->post_handler)
- current_kprobe->post_handler(current_kprobe, regs, 0);
+ if (cur_kprobe->post_handler)
+ cur_kprobe->post_handler(cur_kprobe, regs, 0);
- resume_execution(current_kprobe, regs);
+ resume_execution(cur_kprobe, regs);
reset_current_kprobe();
preempt_enable_no_resched();
return 1;
@@ -545,12 +544,12 @@ static inline int __kprobes post_kprobe_handler(struct pt_regs *regs)
static inline
int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr)
{
- if (current_kprobe->fault_handler &&
- current_kprobe->fault_handler(current_kprobe, regs, trapnr))
+ if (cur_kprobe->fault_handler &&
+ cur_kprobe->fault_handler(cur_kprobe, regs, trapnr))
return 1;
if (kprobe_status & KPROBE_HIT_SS) {
- resume_execution(current_kprobe, regs);
+ resume_execution(cur_kprobe, regs);
reset_current_kprobe();
preempt_enable_no_resched();
}
@@ -567,7 +566,7 @@ int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
switch (val) {
case DIE_BREAKPOINT:
- if (current_kprobe_bp_addr != args->regs->pc) {
+ if (cur_kprobe_bp_addr != args->regs->pc) {
if (kprobe_handler(args->regs))
return NOTIFY_STOP;
} else {