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uprobes: Don't assume that arch_uprobe->insn/ixol is u8[MAX_UINSN_BYTES]

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arch_uprobe should be opaque as much as possible to the generic
code, but currently it assumes that insn/ixol must be u8[] of the
known size. Remove this unnecessary dependency, we can use "&" and
and sizeof() with the same effect.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
This commit is contained in:
Oleg Nesterov 2013-11-09 17:58:54 +01:00
parent 3247343118
commit 803200e24a
1 changed files with 5 additions and 5 deletions
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10
kernel/events/uprobes.c
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@ -330,7 +330,7 @@ int __weak set_swbp(struct arch_uprobe *auprobe, struct mm_struct *mm, unsigned
int __weak
set_orig_insn(struct arch_uprobe *auprobe, struct mm_struct *mm, unsigned long vaddr)
{
return uprobe_write_opcode(mm, vaddr, *(uprobe_opcode_t *)auprobe->insn);
return uprobe_write_opcode(mm, vaddr, *(uprobe_opcode_t *)&auprobe->insn);
}
static int match_uprobe(struct uprobe *l, struct uprobe *r)
@ -529,8 +529,8 @@ static int copy_insn(struct uprobe *uprobe, struct file *filp)
{
struct address_space *mapping = uprobe->inode->i_mapping;
loff_t offs = uprobe->offset;
void *insn = uprobe->arch.insn;
int size = MAX_UINSN_BYTES;
void *insn = &uprobe->arch.insn;
int size = sizeof(uprobe->arch.insn);
int len, err = -EIO;
/* Copy only available bytes, -EIO if nothing was read */
@ -569,7 +569,7 @@ static int prepare_uprobe(struct uprobe *uprobe, struct file *file,
goto out;
ret = -ENOTSUPP;
if (is_trap_insn((uprobe_opcode_t *)uprobe->arch.insn))
if (is_trap_insn((uprobe_opcode_t *)&uprobe->arch.insn))
goto out;
ret = arch_uprobe_analyze_insn(&uprobe->arch, mm, vaddr);
@ -1264,7 +1264,7 @@ static unsigned long xol_get_insn_slot(struct uprobe *uprobe)
/* Initialize the slot */
copy_to_page(area->page, xol_vaddr,
uprobe->arch.ixol, sizeof(uprobe->arch.ixol));
&uprobe->arch.ixol, sizeof(uprobe->arch.ixol));
/*
* We probably need flush_icache_user_range() but it needs vma.
* This should work on supported architectures too.