146 lines
4.6 KiB
Diff
146 lines
4.6 KiB
Diff
From a796bb4eb5c76c3fbd834ca21ec3c15d048d3b5d Mon Sep 17 00:00:00 2001
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From: Frank Rowand <frank.rowand@am.sony.com>
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Date: Wed, 16 May 2012 18:05:53 -0700
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Subject: [PATCH 278/290] fix printk flush of messages
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Reverse preempt-rt-allow-immediate-magic-sysrq-output-for-preempt_rt_full.patch
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The problem addressed by that patch does not exist after applying
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console-make-rt-friendly-update.patch
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Signed-off-by: Frank Rowand <frank.rowand@am.sony.com>
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Link: http://lkml.kernel.org/r/4FB44EF1.9050809@am.sony.com
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Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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[bwh: make apply on top of debian/sysrq-mask.patch]
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---
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drivers/tty/serial/cpm_uart/cpm_uart_core.c | 2 +-
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drivers/tty/sysrq.c | 23 -----------------------
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include/linux/sysrq.h | 5 -----
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kernel/printk.c | 5 ++---
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lib/Kconfig.debug | 22 ----------------------
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5 files changed, 3 insertions(+), 54 deletions(-)
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--- a/drivers/tty/serial/cpm_uart/cpm_uart_core.c
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+++ b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
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@@ -1226,7 +1226,7 @@ static void cpm_uart_console_write(struct console *co, const char *s,
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{
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struct uart_cpm_port *pinfo = &cpm_uart_ports[co->index];
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unsigned long flags;
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- int nolock = oops_in_progress || sysrq_in_progress;
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+ int nolock = oops_in_progress;
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if (unlikely(nolock)) {
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local_irq_save(flags);
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--- a/drivers/tty/sysrq.c
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+++ b/drivers/tty/sysrq.c
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@@ -492,23 +492,6 @@ static void __sysrq_put_key_op(int key, struct sysrq_key_op *op_p)
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sysrq_key_table[i] = op_p;
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}
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-#ifdef CONFIG_MAGIC_SYSRQ_FORCE_PRINTK
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-
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-int sysrq_in_progress;
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-
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-static void set_sysrq_in_progress(int value)
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-{
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- sysrq_in_progress = value;
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-}
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-
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-#else
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-
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-static void set_sysrq_in_progress(int value)
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-{
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-}
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-
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-#endif
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-
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void __handle_sysrq(int key, bool check_mask)
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{
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struct sysrq_key_op *op_p;
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@@ -517,9 +500,6 @@ void __handle_sysrq(int key, bool check_mask)
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unsigned long flags;
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spin_lock_irqsave(&sysrq_key_table_lock, flags);
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-
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- set_sysrq_in_progress(1);
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-
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/*
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* Raise the apparent loglevel to maximum so that the sysrq header
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* is shown to provide the user with positive feedback. We do not
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@@ -561,9 +541,6 @@ void __handle_sysrq(int key, bool check_mask)
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printk("\n");
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console_loglevel = orig_log_level;
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}
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-
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- set_sysrq_in_progress(0);
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-
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spin_unlock_irqrestore(&sysrq_key_table_lock, flags);
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}
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--- a/include/linux/sysrq.h
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+++ b/include/linux/sysrq.h
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@@ -38,11 +38,6 @@ struct sysrq_key_op {
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int enable_mask;
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};
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-#ifdef CONFIG_MAGIC_SYSRQ_FORCE_PRINTK
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-extern int sysrq_in_progress;
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-#else
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-#define sysrq_in_progress 0
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-#endif
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#ifdef CONFIG_MAGIC_SYSRQ
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/* Generic SysRq interface -- you may call it from any device driver, supplying
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--- a/kernel/printk.c
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+++ b/kernel/printk.c
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@@ -21,7 +21,6 @@
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#include <linux/tty.h>
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#include <linux/tty_driver.h>
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#include <linux/console.h>
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-#include <linux/sysrq.h>
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#include <linux/init.h>
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#include <linux/jiffies.h>
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#include <linux/nmi.h>
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@@ -835,8 +834,8 @@ static int console_trylock_for_printk(unsigned int cpu, unsigned long flags)
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{
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int retval = 0, wake = 0;
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#ifdef CONFIG_PREEMPT_RT_FULL
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- int lock = (!early_boot_irqs_disabled && !irqs_disabled_flags(flags) &&
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- (preempt_count() <= 1)) || sysrq_in_progress;
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+ int lock = !early_boot_irqs_disabled && !irqs_disabled_flags(flags) &&
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+ (preempt_count() <= 1);
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#else
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int lock = 1;
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#endif
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--- a/lib/Kconfig.debug
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+++ b/lib/Kconfig.debug
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@@ -62,28 +62,6 @@ config MAGIC_SYSRQ
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Specifies the default mask for the allowed SysRq keys. This can be
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used to disable several sensitive keys by default.
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-config MAGIC_SYSRQ_FORCE_PRINTK
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- bool "Force printk from Magic SysRq"
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- depends on MAGIC_SYSRQ && PREEMPT_RT_FULL
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- default n
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- help
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- Allow the output from Magic SysRq to be output immediately, even if
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- this causes large latencies. This can cause performance problems
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- for real-time processes.
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-
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- If PREEMPT_RT_FULL, printk() will not try to acquire the console lock
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- when interrupts or preemption are disabled. If the console lock is
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- not acquired the printk() output will be buffered, but will not be
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- output immediately. Some drivers call into the Magic SysRq code
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- with interrupts or preemption disabled, so the output of Magic SysRq
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- will be buffered instead of printing immediately if this option is
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- not selected.
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-
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- Even with this option selected, Magic SysRq output will be delayed
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- if the attempt to acquire the console lock fails.
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-
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- Don't say Y unless you really know what this hack does.
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-
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config STRIP_ASM_SYMS
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bool "Strip assembler-generated symbols during link"
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default n
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