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authorLinus Torvalds <torvalds@linux-foundation.org>2014-12-11 17:30:55 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-12-11 17:30:55 -0800
commit27afc5dbda52ee3dbcd0bda7375c917c6936b470 (patch)
tree47591400f85590d48fa71bbfa50e0707e20e4bd0 /kernel/kprobes.c
parent70e71ca0af244f48a5dcf56dc435243792e3a495 (diff)
parent351997810131565fe62aec2c366deccbf6bda3f4 (diff)
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull s390 updates from Martin Schwidefsky: "The most notable change for this pull request is the ftrace rework from Heiko. It brings a small performance improvement and the ground work to support a new gcc option to replace the mcount blocks with a single nop. Two new s390 specific system calls are added to emulate user space mmio for PCI, an artifact of the how PCI memory is accessed. Two patches for the memory management with changes to common code. For KVM mm_forbids_zeropage is added which disables the empty zero page for an mm that is used by a KVM process. And an optimization, pmdp_get_and_clear_full is added analog to ptep_get_and_clear_full. Some micro optimization for the cmpxchg and the spinlock code. And as usual bug fixes and cleanups" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (46 commits) s390/cputime: fix 31-bit compile s390/scm_block: make the number of reqs per HW req configurable s390/scm_block: handle multiple requests in one HW request s390/scm_block: allocate aidaw pages only when necessary s390/scm_block: use mempool to manage aidaw requests s390/eadm: change timeout value s390/mm: fix memory leak of ptlock in pmd_free_tlb s390: use local symbol names in entry[64].S s390/ptrace: always include vector registers in core files s390/simd: clear vector register pointer on fork/clone s390: translate cputime magic constants to macros s390/idle: convert open coded idle time seqcount s390/idle: add missing irq off lockdep annotation s390/debug: avoid function call for debug_sprintf_* s390/kprobes: fix instruction copy for out of line execution s390: remove diag 44 calls from cpu_relax() s390/dasd: retry partition detection s390/dasd: fix list corruption for sleep_on requests s390/dasd: fix infinite term I/O loop s390/dasd: remove unused code ...
Diffstat (limited to 'kernel/kprobes.c')
-rw-r--r--kernel/kprobes.c18
1 files changed, 11 insertions, 7 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 831978cebf1d..06f58309fed2 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -1410,16 +1410,10 @@ static inline int check_kprobe_rereg(struct kprobe *p)
return ret;
}
-static int check_kprobe_address_safe(struct kprobe *p,
- struct module **probed_mod)
+int __weak arch_check_ftrace_location(struct kprobe *p)
{
- int ret = 0;
unsigned long ftrace_addr;
- /*
- * If the address is located on a ftrace nop, set the
- * breakpoint to the following instruction.
- */
ftrace_addr = ftrace_location((unsigned long)p->addr);
if (ftrace_addr) {
#ifdef CONFIG_KPROBES_ON_FTRACE
@@ -1431,7 +1425,17 @@ static int check_kprobe_address_safe(struct kprobe *p,
return -EINVAL;
#endif
}
+ return 0;
+}
+static int check_kprobe_address_safe(struct kprobe *p,
+ struct module **probed_mod)
+{
+ int ret;
+
+ ret = arch_check_ftrace_location(p);
+ if (ret)
+ return ret;
jump_label_lock();
preempt_disable();