diff options
| author |   Srikar Dronamraju <srikar@linux.vnet.ibm.com> | 2012-02-22 14:45:49 +0530 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2012-02-22 11:26:08 +0100 |
| commit | 96379f60075c75b261328aa7830ef8aa158247ac (patch) | |
| tree | c9aa431293c4a61ae30a4b34f0025ab30afed08b | |
| parent | uprobes/core: Make instruction tables volatile (diff) | |
| download | linux-dev-96379f60075c75b261328aa7830ef8aa158247ac.tar.xz linux-dev-96379f60075c75b261328aa7830ef8aa158247ac.zip | |
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.h | 2 | ||||
| -rw-r--r-- | kernel/events/uprobes.c | 6 |
2 files changed, 3 insertions, 5 deletions
diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h index 64e45f116b2a..fd45b70750d4 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 884817f1b0d3..ee496ad95db3 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); |