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x86/dumpstack: Add log_lvl to __show_regs()

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show_trace_log_lvl() provides x86 platform-specific way to unwind
backtrace with a given log level. Unfortunately, registers dump(s) are
not printed with the same log level - instead, KERN_DEFAULT is always
used.

Arista's switches uses quite common setup with rsyslog, where only
urgent messages goes to console (console_log_level=KERN_ERR), everything
else goes into /var/log/ as the console baud-rate often is indecently
slow (9600 bps).

Backtrace dumps without registers printed have proven to be as useful as
morning standups. Furthermore, in order to introduce KERN_UNSUPPRESSED
(which I believe is still the most elegant way to fix raciness of sysrq[1])
the log level should be passed down the stack to register dumping
functions. Besides, there is a potential use-case for printing traces
with KERN_DEBUG level [2] (where registers dump shouldn't appear with
higher log level).

Add log_lvl parameter to __show_regs().
Keep the used log level intact to separate visible change.

[1]: https://lore.kernel.org/lkml/20190528002412.1625-1-dima@arista.com/
[2]: https://lore.kernel.org/linux-doc/20190724170249.9644-1-dima@arista.com/

Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Petr Mladek <pmladek@suse.com>
Link: https://lkml.kernel.org/r/20200629144847.492794-3-dima@arista.com
This commit is contained in:
Dmitry Safonov
2020-06-29 15:48:46 +01:00
committed by Thomas Gleixner
parent fd07f802a7
commit 44e215352c
4 changed files with 49 additions and 43 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
arch/x86/kernel/process_32.c
View File

@@ -56,7 +56,8 @@
#include "process.h"
void __show_regs(struct pt_regs *regs, enum show_regs_mode mode)
void __show_regs(struct pt_regs *regs, enum show_regs_mode mode,
const char *log_lvl)
{
unsigned long cr0 = 0L, cr2 = 0L, cr3 = 0L, cr4 = 0L;
unsigned long d0, d1, d2, d3, d6, d7;
@@ -67,14 +68,14 @@ void __show_regs(struct pt_regs *regs, enum show_regs_mode mode)
else
savesegment(gs, gs);
show_ip(regs, KERN_DEFAULT);
show_ip(regs, log_lvl);
printk(KERN_DEFAULT "EAX: %08lx EBX: %08lx ECX: %08lx EDX: %08lx\n",
regs->ax, regs->bx, regs->cx, regs->dx);
printk(KERN_DEFAULT "ESI: %08lx EDI: %08lx EBP: %08lx ESP: %08lx\n",
regs->si, regs->di, regs->bp, regs->sp);
printk(KERN_DEFAULT "DS: %04x ES: %04x FS: %04x GS: %04x SS: %04x EFLAGS: %08lx\n",
(u16)regs->ds, (u16)regs->es, (u16)regs->fs, gs, regs->ss, regs->flags);
printk("%sEAX: %08lx EBX: %08lx ECX: %08lx EDX: %08lx\n",
log_lvl, regs->ax, regs->bx, regs->cx, regs->dx);
printk("%sESI: %08lx EDI: %08lx EBP: %08lx ESP: %08lx\n",
log_lvl, regs->si, regs->di, regs->bp, regs->sp);
printk("%sDS: %04x ES: %04x FS: %04x GS: %04x SS: %04x EFLAGS: %08lx\n",
log_lvl, (u16)regs->ds, (u16)regs->es, (u16)regs->fs, gs, regs->ss, regs->flags);
if (mode != SHOW_REGS_ALL)
return;
@@ -83,8 +84,8 @@ void __show_regs(struct pt_regs *regs, enum show_regs_mode mode)
cr2 = read_cr2();
cr3 = __read_cr3();
cr4 = __read_cr4();
printk(KERN_DEFAULT "CR0: %08lx CR2: %08lx CR3: %08lx CR4: %08lx\n",
cr0, cr2, cr3, cr4);
printk("%sCR0: %08lx CR2: %08lx CR3: %08lx CR4: %08lx\n",
log_lvl, cr0, cr2, cr3, cr4);
get_debugreg(d0, 0);
get_debugreg(d1, 1);
@@ -98,10 +99,10 @@ void __show_regs(struct pt_regs *regs, enum show_regs_mode mode)
(d6 == DR6_RESERVED) && (d7 == 0x400))
return;
printk(KERN_DEFAULT "DR0: %08lx DR1: %08lx DR2: %08lx DR3: %08lx\n",
d0, d1, d2, d3);
printk(KERN_DEFAULT "DR6: %08lx DR7: %08lx\n",
d6, d7);
printk("%sDR0: %08lx DR1: %08lx DR2: %08lx DR3: %08lx\n",
log_lvl, d0, d1, d2, d3);
printk("%sDR6: %08lx DR7: %08lx\n",
log_lvl, d6, d7);
}
void release_thread(struct task_struct *dead_task)