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Subject[tip:x86/urgent] x86: Use KERN_DEFAULT log-level in __show_regs()
Commit-ID:  d015a092989d673df44a5ad6866dc5d5006b7a2a
Author: Pekka Enberg <>
AuthorDate: Mon, 28 Dec 2009 10:26:59 +0200
Committer: Ingo Molnar <>
CommitDate: Mon, 28 Dec 2009 09:40:21 +0100

x86: Use KERN_DEFAULT log-level in __show_regs()

Andrew Morton reported a strange looking kmemcheck warning:

WARNING: kmemcheck: Caught 32-bit read from uninitialized memory (ffff88004fba6c20)
u u u u u u u u u u u u u u u u i i i i i i i i u u u u u u u u

[<ffffffff810af3aa>] kmemleak_scan+0x25a/0x540
[<ffffffff810afbcb>] kmemleak_scan_thread+0x5b/0xe0
[<ffffffff8104d0fe>] kthread+0x9e/0xb0
[<ffffffff81003074>] kernel_thread_helper+0x4/0x10
[<ffffffffffffffff>] 0xffffffffffffffff

The above printout is missing register dump completely. The
problem here is that the output comes from syslog which doesn't
show KERN_INFO log-level messages. We didn't see this before
because both of us were testing on 32-bit kernels which use the
_default_ log-level.

Fix that up by explicitly using KERN_DEFAULT log-level for
__show_regs() printks.

Signed-off-by: Pekka Enberg <>
Cc: Vegard Nossum <>
Cc: Andrew Morton <>
Cc: Arjan van de Ven <>
Cc: Linus Torvalds <>
LKML-Reference: <1261988819.4641.2.camel@penberg-laptop>
Signed-off-by: Ingo Molnar <>
arch/x86/kernel/process.c | 4 ++--
arch/x86/kernel/process_32.c | 14 +++++++-------
arch/x86/kernel/process_64.c | 24 ++++++++++++------------
3 files changed, 21 insertions(+), 21 deletions(-)

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 98c2cde..c6ee241 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -103,8 +103,8 @@ void show_regs_common(void)
if (!product)
product = "";

- printk("\n");
- printk(KERN_INFO "Pid: %d, comm: %.20s %s %s %.*s %s/%s\n",
+ printk(KERN_CONT "\n");
+ printk(KERN_DEFAULT "Pid: %d, comm: %.20s %s %s %.*s %s/%s\n",
current->pid, current->comm, print_tainted(),
(int)strcspn(init_utsname()->version, " "),
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index 9c517b5..37ad1e0 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -139,16 +139,16 @@ void __show_regs(struct pt_regs *regs, int all)


- printk("EIP: %04x:[<%08lx>] EFLAGS: %08lx CPU: %d\n",
+ printk(KERN_DEFAULT "EIP: %04x:[<%08lx>] EFLAGS: %08lx CPU: %d\n",
(u16)regs->cs, regs->ip, regs->flags,
print_symbol("EIP is at %s\n", regs->ip);

- printk("EAX: %08lx EBX: %08lx ECX: %08lx EDX: %08lx\n",
+ printk(KERN_DEFAULT "EAX: %08lx EBX: %08lx ECX: %08lx EDX: %08lx\n",
regs->ax, regs->bx, regs->cx, regs->dx);
- printk("ESI: %08lx EDI: %08lx EBP: %08lx ESP: %08lx\n",
+ printk(KERN_DEFAULT "ESI: %08lx EDI: %08lx EBP: %08lx ESP: %08lx\n",
regs->si, regs->di, regs->bp, sp);
- printk(" DS: %04x ES: %04x FS: %04x GS: %04x SS: %04x\n",
+ printk(KERN_DEFAULT " DS: %04x ES: %04x FS: %04x GS: %04x SS: %04x\n",
(u16)regs->ds, (u16)regs->es, (u16)regs->fs, gs, ss);

if (!all)
@@ -158,19 +158,19 @@ void __show_regs(struct pt_regs *regs, int all)
cr2 = read_cr2();
cr3 = read_cr3();
cr4 = read_cr4_safe();
- printk("CR0: %08lx CR2: %08lx CR3: %08lx CR4: %08lx\n",
+ printk(KERN_DEFAULT "CR0: %08lx CR2: %08lx CR3: %08lx CR4: %08lx\n",
cr0, cr2, cr3, cr4);

get_debugreg(d0, 0);
get_debugreg(d1, 1);
get_debugreg(d2, 2);
get_debugreg(d3, 3);
- printk("DR0: %08lx DR1: %08lx DR2: %08lx DR3: %08lx\n",
+ printk(KERN_DEFAULT "DR0: %08lx DR1: %08lx DR2: %08lx DR3: %08lx\n",
d0, d1, d2, d3);

get_debugreg(d6, 6);
get_debugreg(d7, 7);
- printk("DR6: %08lx DR7: %08lx\n",
+ printk(KERN_DEFAULT "DR6: %08lx DR7: %08lx\n",
d6, d7);

diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 52fbd0c..f9e0331 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -161,19 +161,19 @@ void __show_regs(struct pt_regs *regs, int all)
unsigned int ds, cs, es;

- printk(KERN_INFO "RIP: %04lx:[<%016lx>] ", regs->cs & 0xffff, regs->ip);
+ printk(KERN_DEFAULT "RIP: %04lx:[<%016lx>] ", regs->cs & 0xffff, regs->ip);
printk_address(regs->ip, 1);
- printk(KERN_INFO "RSP: %04lx:%016lx EFLAGS: %08lx\n", regs->ss,
+ printk(KERN_DEFAULT "RSP: %04lx:%016lx EFLAGS: %08lx\n", regs->ss,
regs->sp, regs->flags);
- printk(KERN_INFO "RAX: %016lx RBX: %016lx RCX: %016lx\n",
+ printk(KERN_DEFAULT "RAX: %016lx RBX: %016lx RCX: %016lx\n",
regs->ax, regs->bx, regs->cx);
- printk(KERN_INFO "RDX: %016lx RSI: %016lx RDI: %016lx\n",
+ printk(KERN_DEFAULT "RDX: %016lx RSI: %016lx RDI: %016lx\n",
regs->dx, regs->si, regs->di);
- printk(KERN_INFO "RBP: %016lx R08: %016lx R09: %016lx\n",
+ printk(KERN_DEFAULT "RBP: %016lx R08: %016lx R09: %016lx\n",
regs->bp, regs->r8, regs->r9);
- printk(KERN_INFO "R10: %016lx R11: %016lx R12: %016lx\n",
+ printk(KERN_DEFAULT "R10: %016lx R11: %016lx R12: %016lx\n",
regs->r10, regs->r11, regs->r12);
- printk(KERN_INFO "R13: %016lx R14: %016lx R15: %016lx\n",
+ printk(KERN_DEFAULT "R13: %016lx R14: %016lx R15: %016lx\n",
regs->r13, regs->r14, regs->r15);

asm("movl %%ds,%0" : "=r" (ds));
@@ -194,21 +194,21 @@ void __show_regs(struct pt_regs *regs, int all)
cr3 = read_cr3();
cr4 = read_cr4();

- printk(KERN_INFO "FS: %016lx(%04x) GS:%016lx(%04x) knlGS:%016lx\n",
+ printk(KERN_DEFAULT "FS: %016lx(%04x) GS:%016lx(%04x) knlGS:%016lx\n",
fs, fsindex, gs, gsindex, shadowgs);
- printk(KERN_INFO "CS: %04x DS: %04x ES: %04x CR0: %016lx\n", cs, ds,
+ printk(KERN_DEFAULT "CS: %04x DS: %04x ES: %04x CR0: %016lx\n", cs, ds,
es, cr0);
- printk(KERN_INFO "CR2: %016lx CR3: %016lx CR4: %016lx\n", cr2, cr3,
+ printk(KERN_DEFAULT "CR2: %016lx CR3: %016lx CR4: %016lx\n", cr2, cr3,

get_debugreg(d0, 0);
get_debugreg(d1, 1);
get_debugreg(d2, 2);
- printk(KERN_INFO "DR0: %016lx DR1: %016lx DR2: %016lx\n", d0, d1, d2);
+ printk(KERN_DEFAULT "DR0: %016lx DR1: %016lx DR2: %016lx\n", d0, d1, d2);
get_debugreg(d3, 3);
get_debugreg(d6, 6);
get_debugreg(d7, 7);
- printk(KERN_INFO "DR3: %016lx DR6: %016lx DR7: %016lx\n", d3, d6, d7);
+ printk(KERN_DEFAULT "DR3: %016lx DR6: %016lx DR7: %016lx\n", d3, d6, d7);

void show_regs(struct pt_regs *regs)

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