* Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote: > On Sun, 6 Jul 2008, Ingo Molnar wrote: > > > > applied (with the commit message below) to tip/x86/debug for v2.6.27 > > merging, thanks Linus. Can i add your SOB too? > > Sure, add my S-O-B. But I hope/assuem that you also added my earlier > patch that added the support for '%pS' too? I'm not entirely sure that > should go in an x86-specific branch, since it has nothing x86-specific > in it. yeah, agreed, combined it's not an x86 topic anymore. [ There's some lkml trouble so i've missed the earlier patch. I'm not sure the email problem is on my side, see how incomplete the discussion is on lkml.org as well: http://lkml.org/lkml/2008/6/25/170 ] Anyway, i have have added this second patch of yours to tip/core/printk and moved your first patch over to that topic (which relies on it). That topic has a few other (smaller) printk enhancements queued for v2.6.27 already: git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git core/printk [find other stats below] so it fits in naturally. Ingo ------------------> Ingo Molnar (1): printk: export console_drivers Jan Kiszka (1): printk: don't prefer unsuited consoles on registration Jiri Slaby (1): x86, generic: mark early_printk as asmlinkage Linus Torvalds (2): printk: add support for '%pS' x86, 64-bit: standardize printk_address() Nick Andrew (2): printk: refactor processing of line severity tokens printk: remember the message level for multi-line output Tejun Heo (1): printk: clean up recursion check related static variables Thomas Gleixner (2): namespacecheck: fix kernel printk.c namespacecheck: more kernel/printk.c fixes arch/x86/kernel/early_printk.c | 2 +- arch/x86/kernel/traps_64.c | 25 +-------- include/linux/kernel.h | 8 +--- kernel/printk.c | 107 +++++++++++++++--------------------- lib/vsprintf.c | 118 +++++++++++++++++++++++++++++----------- 5 files changed, 133 insertions(+), 127 deletions(-) diff --git a/arch/x86/kernel/early_printk.c b/arch/x86/kernel/early_printk.c index 643fd86..ff9e735 100644 --- a/arch/x86/kernel/early_printk.c +++ b/arch/x86/kernel/early_printk.c @@ -196,7 +196,7 @@ static struct console simnow_console = { static struct console *early_console = &early_vga_console; static int early_console_initialized; -void early_printk(const char *fmt, ...) +asmlinkage void early_printk(const char *fmt, ...) { char buf[512]; int n; diff --git a/arch/x86/kernel/traps_64.c b/arch/x86/kernel/traps_64.c index adff76e..f1a95d1 100644 --- a/arch/x86/kernel/traps_64.c +++ b/arch/x86/kernel/traps_64.c @@ -104,30 +104,7 @@ int kstack_depth_to_print = 12; void printk_address(unsigned long address, int reliable) { -#ifdef CONFIG_KALLSYMS - unsigned long offset = 0, symsize; - const char *symname; - char *modname; - char *delim = ":"; - char namebuf[KSYM_NAME_LEN]; - char reliab[4] = ""; - - symname = kallsyms_lookup(address, &symsize, &offset, - &modname, namebuf); - if (!symname) { - printk(" [<%016lx>]\n", address); - return; - } - if (!reliable) - strcpy(reliab, "? "); - - if (!modname) - modname = delim = ""; - printk(" [<%016lx>] %s%s%s%s%s+0x%lx/0x%lx\n", - address, reliab, delim, modname, delim, symname, offset, symsize); -#else - printk(" [<%016lx>]\n", address); -#endif + printk(" [<%016lx>] %s%pS\n", address, reliable ? "": "? ", (void *) address); } static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack, diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 792bf0a..4cb8d3d 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -184,9 +184,6 @@ asmlinkage int vprintk(const char *fmt, va_list args) __attribute__ ((format (printf, 1, 0))); asmlinkage int printk(const char * fmt, ...) __attribute__ ((format (printf, 1, 2))) __cold; -extern int log_buf_get_len(void); -extern int log_buf_read(int idx); -extern int log_buf_copy(char *dest, int idx, int len); extern int printk_ratelimit_jiffies; extern int printk_ratelimit_burst; @@ -202,9 +199,6 @@ static inline int vprintk(const char *s, va_list args) { return 0; } static inline int printk(const char *s, ...) __attribute__ ((format (printf, 1, 2))); static inline int __cold printk(const char *s, ...) { return 0; } -static inline int log_buf_get_len(void) { return 0; } -static inline int log_buf_read(int idx) { return 0; } -static inline int log_buf_copy(char *dest, int idx, int len) { return 0; } static inline int printk_ratelimit(void) { return 0; } static inline int __printk_ratelimit(int ratelimit_jiffies, \ int ratelimit_burst) { return 0; } @@ -213,7 +207,7 @@ static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \ { return false; } #endif -extern void __attribute__((format(printf, 1, 2))) +extern void asmlinkage __attribute__((format(printf, 1, 2))) early_printk(const char *fmt, ...); unsigned long int_sqrt(unsigned long); diff --git a/kernel/printk.c b/kernel/printk.c index 8fb01c3..de1a4f4 100644 --- a/kernel/printk.c +++ b/kernel/printk.c @@ -38,7 +38,7 @@ /* * Architectures can override it: */ -void __attribute__((weak)) early_printk(const char *fmt, ...) +void asmlinkage __attribute__((weak)) early_printk(const char *fmt, ...) { } @@ -75,6 +75,8 @@ EXPORT_SYMBOL(oops_in_progress); static DECLARE_MUTEX(console_sem); static DECLARE_MUTEX(secondary_console_sem); struct console *console_drivers; +EXPORT_SYMBOL_GPL(console_drivers); + /* * This is used for debugging the mess that is the VT code by * keeping track if we have the console semaphore held. It's @@ -231,7 +233,7 @@ static inline void boot_delay_msec(void) /* * Return the number of unread characters in the log buffer. */ -int log_buf_get_len(void) +static int log_buf_get_len(void) { return logged_chars; } @@ -268,19 +270,6 @@ int log_buf_copy(char *dest, int idx, int len) } /* - * Extract a single character from the log buffer. - */ -int log_buf_read(int idx) -{ - char ret; - - if (log_buf_copy(&ret, idx, 1) == 1) - return ret; - else - return -1; -} - -/* * Commands to do_syslog: * * 0 -- Close the log. Currently a NOP. @@ -665,18 +654,17 @@ static int acquire_console_semaphore_for_printk(unsigned int cpu) spin_unlock(&logbuf_lock); return retval; } - -const char printk_recursion_bug_msg [] = - KERN_CRIT "BUG: recent printk recursion!\n"; -static int printk_recursion_bug; +static const char recursion_bug_msg [] = + KERN_CRIT "BUG: recent printk recursion!\n"; +static int recursion_bug; + static int new_text_line = 1; +static char printk_buf[1024]; asmlinkage int vprintk(const char *fmt, va_list args) { - static int log_level_unknown = 1; - static char printk_buf[1024]; - - unsigned long flags; int printed_len = 0; + int current_log_level = default_message_loglevel; + unsigned long flags; int this_cpu; char *p; @@ -699,7 +687,7 @@ asmlinkage int vprintk(const char *fmt, va_list args) * it can be printed at the next appropriate moment: */ if (!oops_in_progress) { - printk_recursion_bug = 1; + recursion_bug = 1; goto out_restore_irqs; } zap_locks(); @@ -709,70 +697,62 @@ asmlinkage int vprintk(const char *fmt, va_list args) spin_lock(&logbuf_lock); printk_cpu = this_cpu; - if (printk_recursion_bug) { - printk_recursion_bug = 0; - strcpy(printk_buf, printk_recursion_bug_msg); - printed_len = sizeof(printk_recursion_bug_msg); + if (recursion_bug) { + recursion_bug = 0; + strcpy(printk_buf, recursion_bug_msg); + printed_len = sizeof(recursion_bug_msg); } /* Emit the output into the temporary buffer */ printed_len += vscnprintf(printk_buf + printed_len, sizeof(printk_buf) - printed_len, fmt, args); + /* * Copy the output into log_buf. If the caller didn't provide * appropriate log level tags, we insert them here */ for (p = printk_buf; *p; p++) { - if (log_level_unknown) { - /* log_level_unknown signals the start of a new line */ + if (new_text_line) { + /* If a token, set current_log_level and skip over */ + if (p[0] == '<' && p[1] >= '0' && p[1] <= '7' && + p[2] == '>') { + current_log_level = p[1] - '0'; + p += 3; + printed_len -= 3; + } + + /* Always output the token */ + emit_log_char('<'); + emit_log_char(current_log_level + '0'); + emit_log_char('>'); + printed_len += 3; + new_text_line = 0; + if (printk_time) { - int loglev_char; + /* Follow the token with the time */ char tbuf[50], *tp; unsigned tlen; unsigned long long t; unsigned long nanosec_rem; - /* - * force the log level token to be - * before the time output. - */ - if (p[0] == '<' && p[1] >='0' && - p[1] <= '7' && p[2] == '>') { - loglev_char = p[1]; - p += 3; - printed_len -= 3; - } else { - loglev_char = default_message_loglevel - + '0'; - } t = cpu_clock(printk_cpu); nanosec_rem = do_div(t, 1000000000); - tlen = sprintf(tbuf, - "<%c>[%5lu.%06lu] ", - loglev_char, - (unsigned long)t, - nanosec_rem/1000); + tlen = sprintf(tbuf, "[%5lu.%06lu] ", + (unsigned long) t, + nanosec_rem / 1000); for (tp = tbuf; tp < tbuf + tlen; tp++) emit_log_char(*tp); printed_len += tlen; - } else { - if (p[0] != '<' || p[1] < '0' || - p[1] > '7' || p[2] != '>') { - emit_log_char('<'); - emit_log_char(default_message_loglevel - + '0'); - emit_log_char('>'); - printed_len += 3; - } } - log_level_unknown = 0; + if (!*p) break; } + emit_log_char(*p); if (*p == '\n') - log_level_unknown = 1; + new_text_line = 1; } /* @@ -1172,8 +1152,11 @@ void register_console(struct console *console) console->index = 0; if (console->setup == NULL || console->setup(console, NULL) == 0) { - console->flags |= CON_ENABLED | CON_CONSDEV; - preferred_console = 0; + console->flags |= CON_ENABLED; + if (console->device) { + console->flags |= CON_CONSDEV; + preferred_console = 0; + } } } diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 6021757..f60c7c0 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -22,6 +22,8 @@ #include <linux/string.h> #include <linux/ctype.h> #include <linux/kernel.h> +#include <linux/kallsyms.h> +#include <linux/uaccess.h> #include <asm/page.h> /* for PAGE_SIZE */ #include <asm/div64.h> @@ -482,6 +484,82 @@ static char *number(char *buf, char *end, unsigned long long num, int base, int return buf; } +static char *string(char *buf, char *end, char *s, int field_width, int precision, int flags) +{ + int len, i; + + if ((unsigned long)s < PAGE_SIZE) + s = "<NULL>"; + + len = strnlen(s, precision); + + if (!(flags & LEFT)) { + while (len < field_width--) { + if (buf < end) + *buf = ' '; + ++buf; + } + } + for (i = 0; i < len; ++i) { + if (buf < end) + *buf = *s; + ++buf; ++s; + } + while (len < field_width--) { + if (buf < end) + *buf = ' '; + ++buf; + } + return buf; +} + +static inline void *dereference_function_descriptor(void *ptr) +{ +#if defined(CONFIG_IA64) || defined(CONFIG_PPC64) + void *p; + if (!probe_kernel_address(ptr, p)) + ptr = p; +#endif + return ptr; +} + + +/* + * Show a '%p' thing. A kernel extension is that the '%p' is followed + * by an extra set of alphanumeric characters that are extended format + * specifiers. Right now we just handle 'F' (for symbolic Function + * pointers) and 'S' (for Symbolic data pointers), but this can easily + * be extended in the future (network address types etc). + * + * The difference between 'S' and 'F' is that on ia64 and ppc64 function + * pointers are really function descriptors, which contain a pointer the + * real address. + */ +static char *pointer(const char *fmt, char *buf, char *end, void *ptr, int base, int size, int precision, int type) +{ + switch (*fmt) { + case 'F': + ptr = dereference_function_descriptor(ptr); + /* Fallthrough */ + case 'S': { /* Other (direct) pointer */ +#if CONFIG_KALLSYMS + char sym[KSYM_SYMBOL_LEN]; + sprint_symbol(sym, (unsigned long) ptr); + return string(buf, end, sym, size, precision, type); +#else + type |= SPECIAL; + break; +#endif + } + } + type |= SMALL; + if (precision == -1) { + precision = 2*sizeof(void *); + type |= ZEROPAD; + } + return number(buf, end, (unsigned long long) ptr, base, size, precision, type); +} + /** * vsnprintf - Format a string and place it in a buffer * @buf: The buffer to place the result into @@ -502,11 +580,9 @@ static char *number(char *buf, char *end, unsigned long long num, int base, int */ int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) { - int len; unsigned long long num; - int i, base; + int base; char *str, *end, c; - const char *s; int flags; /* flags to number() */ @@ -622,40 +698,16 @@ int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) continue; case 's': - s = va_arg(args, char *); - if ((unsigned long)s < PAGE_SIZE) - s = "<NULL>"; - - len = strnlen(s, precision); - - if (!(flags & LEFT)) { - while (len < field_width--) { - if (str < end) - *str = ' '; - ++str; - } - } - for (i = 0; i < len; ++i) { - if (str < end) - *str = *s; - ++str; ++s; - } - while (len < field_width--) { - if (str < end) - *str = ' '; - ++str; - } + str = string(str, end, va_arg(args, char *), field_width, precision, flags); continue; case 'p': - flags |= SMALL; - if (field_width == -1) { - field_width = 2*sizeof(void *); - flags |= ZEROPAD; - } - str = number(str, end, - (unsigned long) va_arg(args, void *), + str = pointer(fmt+1, str, end, + va_arg(args, void *), 16, field_width, precision, flags); + /* Skip all alphanumeric pointer suffixes */ + while (isalnum(fmt[1])) + fmt++; continue; -- To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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