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ftrace: nmi safe code clean ups

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Impact: cleanup

This patch cleans up the NMI safe code for dynamic ftrace as suggested
by Andrew Morton.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Steven Rostedt
2008-10-31 00:03:22 -04:00
committed by Ingo Molnar
parent b807c3d0f8
commit a26a2a2739
8 changed files with 28 additions and 26 deletions
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16
arch/x86/kernel/ftrace.c
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@@ -67,7 +67,7 @@ unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr)
*
* Two buffers are added: An IP buffer and a "code" buffer.
*
* 1) Put in the instruction pointer into the IP buffer
* 1) Put the instruction pointer into the IP buffer
* and the new code into the "code" buffer.
* 2) Set a flag that says we are modifying code
* 3) Wait for any running NMIs to finish.
@@ -85,14 +85,14 @@ unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr)
* are the same as what exists.
*/
static atomic_t in_nmi;
static int mod_code_status;
static int mod_code_write;
static void *mod_code_ip;
static void *mod_code_newcode;
static atomic_t in_nmi = ATOMIC_INIT(0);
static int mod_code_status; /* holds return value of text write */
static int mod_code_write; /* set when NMI should do the write */
static void *mod_code_ip; /* holds the IP to write to */
static void *mod_code_newcode; /* holds the text to write to the IP */
static int nmi_wait_count;
static atomic_t nmi_update_count;
static unsigned nmi_wait_count;
static atomic_t nmi_update_count = ATOMIC_INIT(0);
int ftrace_arch_read_dyn_info(char *buf, int size)
{