printk changes for 6.4

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Merge tag 'printk-for-6.4' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux

Pull printk updates from Petr Mladek:

 - Code cleanup and dead code removal

* tag 'printk-for-6.4' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux:
  printk: Remove obsoleted check for non-existent "user" object
  lib/vsprintf: Use isodigit() for the octal number check
  Remove orphaned CONFIG_PRINTK_SAFE_LOG_BUF_SHIFT

arch/powerpc/configs/microwatt_defconfig

@@ -4,7 +4,6 @@ CONFIG_HIGH_RES_TIMERS=y
 CONFIG_PREEMPT_VOLUNTARY=y
 CONFIG_TICK_CPU_ACCOUNTING=y
 CONFIG_LOG_BUF_SHIFT=16
-CONFIG_PRINTK_SAFE_LOG_BUF_SHIFT=12
 CONFIG_CGROUPS=y
 CONFIG_BLK_DEV_INITRD=y
 CONFIG_CC_OPTIMIZE_FOR_SIZE=y

arch/riscv/configs/nommu_k210_defconfig

@@ -1,6 +1,5 @@
 # CONFIG_CPU_ISOLATION is not set
 CONFIG_LOG_BUF_SHIFT=13
-CONFIG_PRINTK_SAFE_LOG_BUF_SHIFT=12
 CONFIG_BLK_DEV_INITRD=y
 # CONFIG_RD_GZIP is not set
 # CONFIG_RD_BZIP2 is not set

arch/riscv/configs/nommu_k210_sdcard_defconfig

@@ -1,6 +1,5 @@
 # CONFIG_CPU_ISOLATION is not set
 CONFIG_LOG_BUF_SHIFT=13
-CONFIG_PRINTK_SAFE_LOG_BUF_SHIFT=12
 CONFIG_CC_OPTIMIZE_FOR_SIZE=y
 # CONFIG_SYSFS_SYSCALL is not set
 # CONFIG_FHANDLE is not set

arch/riscv/configs/nommu_virt_defconfig

@@ -1,6 +1,5 @@
 # CONFIG_CPU_ISOLATION is not set
 CONFIG_LOG_BUF_SHIFT=16
-CONFIG_PRINTK_SAFE_LOG_BUF_SHIFT=12
 CONFIG_BLK_DEV_INITRD=y
 # CONFIG_RD_BZIP2 is not set
 # CONFIG_RD_LZMA is not set

init/Kconfig

@@ -765,30 +765,6 @@ config LOG_CPU_MAX_BUF_SHIFT
 		     13 =>   8 KB for each CPU
 		     12 =>   4 KB for each CPU
 
-config PRINTK_SAFE_LOG_BUF_SHIFT
-	int "Temporary per-CPU printk log buffer size (12 => 4KB, 13 => 8KB)"
-	range 10 21
-	default 13
-	depends on PRINTK
-	help
-	  Select the size of an alternate printk per-CPU buffer where messages
-	  printed from unsafe contexts are temporary stored. One example would
-	  be NMI messages, another one - printk recursion. The messages are
-	  copied to the main log buffer in a safe context to avoid a deadlock.
-	  The value defines the size as a power of 2.
-
-	  Those messages are rare and limited. The largest one is when
-	  a backtrace is printed. It usually fits into 4KB. Select
-	  8KB if you want to be on the safe side.
-
-	  Examples:
-		     17 => 128 KB for each CPU
-		     16 =>  64 KB for each CPU
-		     15 =>  32 KB for each CPU
-		     14 =>  16 KB for each CPU
-		     13 =>   8 KB for each CPU
-		     12 =>   4 KB for each CPU
-
 config PRINTK_INDEX
 	bool "Printk indexing debugfs interface"
 	depends on PRINTK && DEBUG_FS

kernel/printk/printk.c

@@ -730,7 +730,7 @@ static ssize_t devkmsg_write(struct kiocb *iocb, struct iov_iter *from)
 	size_t len = iov_iter_count(from);
 	ssize_t ret = len;
 
-	if (!user || len > PRINTKRB_RECORD_MAX)
+	if (len > PRINTKRB_RECORD_MAX)
 		return -EINVAL;
 
 	/* Ignore when user logging is disabled. */
@@ -792,9 +792,6 @@ static ssize_t devkmsg_read(struct file *file, char __user *buf,
 	};
 	ssize_t ret;
 
-	if (!user)
-		return -EBADF;
-
 	ret = mutex_lock_interruptible(&user->lock);
 	if (ret)
 		return ret;
@@ -859,8 +856,6 @@ static loff_t devkmsg_llseek(struct file *file, loff_t offset, int whence)
 	struct devkmsg_user *user = file->private_data;
 	loff_t ret = 0;
 
-	if (!user)
-		return -EBADF;
 	if (offset)
 		return -ESPIPE;
 
@@ -893,9 +888,6 @@ static __poll_t devkmsg_poll(struct file *file, poll_table *wait)
 	struct printk_info info;
 	__poll_t ret = 0;
 
-	if (!user)
-		return EPOLLERR|EPOLLNVAL;
-
 	poll_wait(file, &log_wait, wait);
 
 	if (prb_read_valid_info(prb, atomic64_read(&user->seq), &info, NULL)) {
@@ -944,9 +936,6 @@ static int devkmsg_release(struct inode *inode, struct file *file)
 {
 	struct devkmsg_user *user = file->private_data;
 
-	if (!user)
-		return 0;
-
 	ratelimit_state_exit(&user->rs);
 
 	mutex_destroy(&user->lock);

lib/vsprintf.c

@@ -3621,7 +3621,7 @@ int vsscanf(const char *buf, const char *fmt, va_list args)
 		if (!digit
 		    || (base == 16 && !isxdigit(digit))
 		    || (base == 10 && !isdigit(digit))
-		    || (base == 8 && (!isdigit(digit) || digit > '7'))
+		    || (base == 8 && !isodigit(digit))
 		    || (base == 0 && !isdigit(digit)))
 			break;