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authorSrikar Dronamraju <srikar@linux.vnet.ibm.com>2012-02-22 14:45:49 +0530
committerIngo Molnar <mingo@elte.hu>2012-02-22 11:26:08 +0100
commit96379f60075c75b261328aa7830ef8aa158247ac (patch)
treec9aa431293c4a61ae30a4b34f0025ab30afed08b
parent04a3d984d32e47983770d314cdb4e4d8f38fccb7 (diff)
downloadop-kernel-dev-96379f60075c75b261328aa7830ef8aa158247ac.zip
op-kernel-dev-96379f60075c75b261328aa7830ef8aa158247ac.tar.gz
uprobes/core: Remove uprobe_opcode_sz
uprobe_opcode_sz refers to the smallest instruction size for that architecture. UPROBES_BKPT_INSN_SIZE refers to the size of the breakpoint instruction for that architecture. For now we are assuming that both uprobe_opcode_sz and UPROBES_BKPT_INSN_SIZE are the same for all archs and hence removing uprobe_opcode_sz in favour of UPROBES_BKPT_INSN_SIZE. However if we have to support architectures where the smallest instruction size is different from the size of breakpoint instruction, we may have to re-introduce uprobe_opcode_sz. Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Anton Arapov <anton@redhat.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Jim Keniston <jkenisto@linux.vnet.ibm.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Josh Stone <jistone@redhat.com> Link: http://lkml.kernel.org/r/20120222091549.15880.67020.sendpatchset@srdronam.in.ibm.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--include/linux/uprobes.h2
-rw-r--r--kernel/events/uprobes.c6
2 files changed, 3 insertions, 5 deletions
diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h
index 64e45f1..fd45b70 100644
--- a/include/linux/uprobes.h
+++ b/include/linux/uprobes.h
@@ -37,8 +37,6 @@ struct uprobe_arch_info {};
#define MAX_UINSN_BYTES 4
#endif
-#define uprobe_opcode_sz sizeof(uprobe_opcode_t)
-
/* flags that denote/change uprobes behaviour */
/* Have a copy of original instruction */
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 884817f..ee496ad 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -244,8 +244,8 @@ static int write_opcode(struct mm_struct *mm, struct uprobe *uprobe,
/* poke the new insn in, ASSUMES we don't cross page boundary */
vaddr &= ~PAGE_MASK;
- BUG_ON(vaddr + uprobe_opcode_sz > PAGE_SIZE);
- memcpy(vaddr_new + vaddr, &opcode, uprobe_opcode_sz);
+ BUG_ON(vaddr + UPROBES_BKPT_INSN_SIZE > PAGE_SIZE);
+ memcpy(vaddr_new + vaddr, &opcode, UPROBES_BKPT_INSN_SIZE);
kunmap_atomic(vaddr_new);
kunmap_atomic(vaddr_old);
@@ -293,7 +293,7 @@ static int read_opcode(struct mm_struct *mm, unsigned long vaddr, uprobe_opcode_
lock_page(page);
vaddr_new = kmap_atomic(page);
vaddr &= ~PAGE_MASK;
- memcpy(opcode, vaddr_new + vaddr, uprobe_opcode_sz);
+ memcpy(opcode, vaddr_new + vaddr, UPROBES_BKPT_INSN_SIZE);
kunmap_atomic(vaddr_new);
unlock_page(page);
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