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[PATCH] uml: remove debugging code from page fault path 

This eliminates the segfault info ring buffer, which added a system call to
each page fault, and which hadn't been useful for debugging in ages.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jeff Dike 2005-09-03 15:57:12 -07:00 committed by Linus Torvalds
parent 49f9ebc894
commit 96e59245e1
2 changed files with 0 additions and 48 deletions
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27
arch/um/kernel/trap_kern.c
View File

@ -200,30 +200,3 @@ void winch(int sig, union uml_pt_regs *regs)
void trap_init(void) void trap_init(void)
{ {
} }
DEFINE_SPINLOCK(trap_lock);
static int trap_index = 0;
int next_trap_index(int limit)
{
int ret;
spin_lock(&trap_lock);
ret = trap_index;
if(++trap_index == limit)
trap_index = 0;
spin_unlock(&trap_lock);
return(ret);
}
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/

21
arch/um/kernel/trap_user.c
View File

@ -40,35 +40,14 @@ void kill_child_dead(int pid)
} while(1); } while(1);
} }
/* Unlocked - don't care if this is a bit off */
int nsegfaults = 0;
struct {
unsigned long address;
int is_write;
int pid;
unsigned long sp;
int is_user;
} segfault_record[1024];
void segv_handler(int sig, union uml_pt_regs *regs) void segv_handler(int sig, union uml_pt_regs *regs)
{ {
int index, max;
struct faultinfo * fi = UPT_FAULTINFO(regs); struct faultinfo * fi = UPT_FAULTINFO(regs);
if(UPT_IS_USER(regs) && !SEGV_IS_FIXABLE(fi)){ if(UPT_IS_USER(regs) && !SEGV_IS_FIXABLE(fi)){
bad_segv(*fi, UPT_IP(regs)); bad_segv(*fi, UPT_IP(regs));
return; return;
} }
max = sizeof(segfault_record)/sizeof(segfault_record[0]);
index = next_trap_index(max);
nsegfaults++;
segfault_record[index].address = FAULT_ADDRESS(*fi);
segfault_record[index].pid = os_getpid();
segfault_record[index].is_write = FAULT_WRITE(*fi);
segfault_record[index].sp = UPT_SP(regs);
segfault_record[index].is_user = UPT_IS_USER(regs);
segv(*fi, UPT_IP(regs), UPT_IS_USER(regs), regs); segv(*fi, UPT_IP(regs), UPT_IS_USER(regs), regs);
} }