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powerpc, hw_breakpoint: Discard extraneous interrupt due to accesses outside symbol length

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Many a times, the requested breakpoint length can be less than the
fixed breakpoint length i.e. 8 bytes supported by PowerPC 64-bit
server (Book III S) processors.  This could lead to extraneous
interrupts resulting in false breakpoint notifications.  This
detects and discards such interrupts for non-ptrace requests.
We don't change ptrace behaviour to avoid breaking compatability.

[Suggestion from Paul Mackerras <paulus@samba.org> to add a new flag in
'struct arch_hw_breakpoint' to identify extraneous interrupts]

Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
K.Prasad
2010-06-15 11:36:12 +05:30
committed by Paul Mackerras
parent 06532a6743
commit e3e94084ad
2 changed files with 22 additions and 2 deletions
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arch/powerpc/include/asm/hw_breakpoint.h
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@@ -27,6 +27,7 @@
#ifdef CONFIG_HAVE_HW_BREAKPOINT
struct arch_hw_breakpoint {
bool extraneous_interrupt;
u8 len; /* length of the target data symbol */
int type;
unsigned long address;