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Code Issues Releases Wiki Activity

i386: clean up oops/bug reports

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Typically the oops first lines look like this:

BUG: unable to handle kernel NULL pointer dereference at virtual address 00000000
 printing eip:
c049dfbd
*pde = 00000000
Oops: 0002 [#1]
PREEMPT SMP
...

Such output is gained with some ugly if (!nl) printk("\n"); code and
besides being a waste of lines, this is also annoying to read. The
following output looks better (and it is how it looks on x86_64):

BUG: unable to handle kernel NULL pointer dereference at virtual address 00000000
printing eip: c049dfbd *pde = 00000000
Oops: 0002 [#1] PREEMPT SMP
...

[ tglx: arch/x86 adaptation ]

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Pavel Emelyanov 2007-10-17 18:04:40 +02:00 committed by Thomas Gleixner
parent c1e3619edd
commit 9aa8d7195a
2 changed files with 12 additions and 18 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

17
arch/x86/kernel/traps_32.c
View file

@ -398,31 +398,24 @@ void die(const char * str, struct pt_regs * regs, long err)
local_save_flags(flags);
if (++die.lock_owner_depth < 3) {
int nl = 0;
unsigned long esp;
unsigned short ss;
report_bug(regs->eip, regs);
printk(KERN_EMERG "%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter);
printk(KERN_EMERG "%s: %04lx [#%d] ", str, err & 0xffff,
++die_counter);
#ifdef CONFIG_PREEMPT
printk(KERN_EMERG "PREEMPT ");
nl = 1;
printk("PREEMPT ");
#endif
#ifdef CONFIG_SMP
if (!nl)
printk(KERN_EMERG);
printk("SMP ");
nl = 1;
#endif
#ifdef CONFIG_DEBUG_PAGEALLOC
if (!nl)
printk(KERN_EMERG);
printk("DEBUG_PAGEALLOC");
nl = 1;
#endif
if (nl)
printk("\n");
printk("\n");
if (notify_die(DIE_OOPS, str, regs, err,
current->thread.trap_no, SIGSEGV) !=
NOTIFY_STOP) {

13
arch/x86/mm/fault_32.c
View file

@ -539,23 +539,22 @@ fastcall void __kprobes do_page_fault(struct pt_regs *regs,
printk(KERN_ALERT "BUG: unable to handle kernel paging"
" request");
printk(" at virtual address %08lx\n",address);
printk(KERN_ALERT " printing eip:\n");
printk("%08lx\n", regs->eip);
printk(KERN_ALERT "printing eip: %08lx ", regs->eip);
page = read_cr3();
page = ((__typeof__(page) *) __va(page))[address >> PGDIR_SHIFT];
#ifdef CONFIG_X86_PAE
printk(KERN_ALERT "*pdpt = %016Lx\n", page);
printk("*pdpt = %016Lx ", page);
if ((page >> PAGE_SHIFT) < max_low_pfn
&& page & _PAGE_PRESENT) {
page &= PAGE_MASK;
page = ((__typeof__(page) *) __va(page))[(address >> PMD_SHIFT)
& (PTRS_PER_PMD - 1)];
printk(KERN_ALERT "*pde = %016Lx\n", page);
printk(KERN_ALERT "*pde = %016Lx ", page);
page &= ~_PAGE_NX;
}
#else
printk(KERN_ALERT "*pde = %08lx\n", page);
printk("*pde = %08lx ", page);
#endif
/*
@ -569,8 +568,10 @@ fastcall void __kprobes do_page_fault(struct pt_regs *regs,
page &= PAGE_MASK;
page = ((__typeof__(page) *) __va(page))[(address >> PAGE_SHIFT)
& (PTRS_PER_PTE - 1)];
printk(KERN_ALERT "*pte = %0*Lx\n", sizeof(page)*2, (u64)page);
printk("*pte = %0*Lx ", sizeof(page)*2, (u64)page);
}
printk("\n");
}
tsk->thread.cr2 = address;