[PATCH 4/4] perf/x86: Remove get_hbp_len and replace with bp_len

Frederic Weisbecker
2014-05-29T15:27:16Z

From: Jacob Shin <jacob.w.shin@gmail.com>

Clean up the logic for determining the breakpoint length

Signed-off-by: Jacob Shin <jacob.w.shin@gmail.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: xiakaixu <xiakaixu@huawei.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
---
arch/x86/kernel/hw_breakpoint.c | 25 +------------------------
1 file changed, 1 insertion(+), 24 deletions(-)

diff --git a/arch/x86/kernel/hw_breakpoint.c b/arch/x86/kernel/hw_breakpoint.c
index fa24eb5..2a9000c 100644
--- a/arch/x86/kernel/hw_breakpoint.c
+++ b/arch/x86/kernel/hw_breakpoint.c
@@ -168,29 +168,6 @@ void arch_uninstall_hw_breakpoint(struct perf_event *bp)
set_dr_addr_mask(0, i);
}

-static int get_hbp_len(u8 hbp_len)
-{
- unsigned int len_in_bytes = 0;
-
- switch (hbp_len) {
- case X86_BREAKPOINT_LEN_1:
- len_in_bytes = 1;
- break;
- case X86_BREAKPOINT_LEN_2:
- len_in_bytes = 2;
- break;
- case X86_BREAKPOINT_LEN_4:
- len_in_bytes = 4;
- break;
-#ifdef CONFIG_X86_64
- case X86_BREAKPOINT_LEN_8:
- len_in_bytes = 8;
- break;
-#endif
- }
- return len_in_bytes;
-}
-
/*
* Check for virtual address in kernel space.
*/
@@ -201,7 +178,7 @@ int arch_check_bp_in_kernelspace(struct perf_event *bp)
struct arch_hw_breakpoint *info = counter_arch_bp(bp);

va = info->address;
- len = get_hbp_len(info->len);
+ len = bp->attr.bp_len;

return (va >= TASK_SIZE) && ((va + len - 1) >= TASK_SIZE);
}
--
1.8.3.1