diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/DocBook/kernel-locking.tmpl | 123 | ||||
| -rw-r--r-- | Documentation/gpio.txt | 8 | ||||
| -rw-r--r-- | Documentation/vm/slabinfo.c | 17 |
3 files changed, 96 insertions, 52 deletions
diff --git a/Documentation/DocBook/kernel-locking.tmpl b/Documentation/DocBook/kernel-locking.tmpl index 644c388..0a441f7 100644 --- a/Documentation/DocBook/kernel-locking.tmpl +++ b/Documentation/DocBook/kernel-locking.tmpl @@ -551,10 +551,12 @@ <function>spin_lock_irqsave()</function>, which is a superset of all other spinlock primitives. </para> + <table> <title>Table of Locking Requirements</title> <tgroup cols="11"> <tbody> + <row> <entry></entry> <entry>IRQ Handler A</entry> @@ -576,97 +578,128 @@ <row> <entry>IRQ Handler B</entry> -<entry>spin_lock_irqsave</entry> +<entry>SLIS</entry> <entry>None</entry> </row> <row> <entry>Softirq A</entry> -<entry>spin_lock_irq</entry> -<entry>spin_lock_irq</entry> -<entry>spin_lock</entry> +<entry>SLI</entry> +<entry>SLI</entry> +<entry>SL</entry> </row> <row> <entry>Softirq B</entry> -<entry>spin_lock_irq</entry> -<entry>spin_lock_irq</entry> -<entry>spin_lock</entry> -<entry>spin_lock</entry> +<entry>SLI</entry> +<entry>SLI</entry> +<entry>SL</entry> +<entry>SL</entry> </row> <row> <entry>Tasklet A</entry> -<entry>spin_lock_irq</entry> -<entry>spin_lock_irq</entry> -<entry>spin_lock</entry> -<entry>spin_lock</entry> +<entry>SLI</entry> +<entry>SLI</entry> +<entry>SL</entry> +<entry>SL</entry> <entry>None</entry> </row> <row> <entry>Tasklet B</entry> -<entry>spin_lock_irq</entry> -<entry>spin_lock_irq</entry> -<entry>spin_lock</entry> -<entry>spin_lock</entry> -<entry>spin_lock</entry> +<entry>SLI</entry> +<entry>SLI</entry> +<entry>SL</entry> +<entry>SL</entry> +<entry>SL</entry> <entry>None</entry> </row> <row> <entry>Timer A</entry> -<entry>spin_lock_irq</entry> -<entry>spin_lock_irq</entry> -<entry>spin_lock</entry> -<entry>spin_lock</entry> -<entry>spin_lock</entry> -<entry>spin_lock</entry> +<entry>SLI</entry> +<entry>SLI</entry> +<entry>SL</entry> +<entry>SL</entry> +<entry>SL</entry> +<entry>SL</entry> <entry>None</entry> </row> <row> <entry>Timer B</entry> -<entry>spin_lock_irq</entry> -<entry>spin_lock_irq</entry> -<entry>spin_lock</entry> -<entry>spin_lock</entry> -<entry>spin_lock</entry> -<entry>spin_lock</entry> -<entry>spin_lock</entry> +<entry>SLI</entry> +<entry>SLI</entry> +<entry>SL</entry> +<entry>SL</entry> +<entry>SL</entry> +<entry>SL</entry> +<entry>SL</entry> <entry>None</entry> </row> <row> <entry>User Context A</entry> -<entry>spin_lock_irq</entry> -<entry>spin_lock_irq</entry> -<entry>spin_lock_bh</entry> -<entry>spin_lock_bh</entry> -<entry>spin_lock_bh</entry> -<entry>spin_lock_bh</entry> -<entry>spin_lock_bh</entry> -<entry>spin_lock_bh</entry> +<entry>SLI</entry> +<entry>SLI</entry> +<entry>SLBH</entry> +<entry>SLBH</entry> +<entry>SLBH</entry> +<entry>SLBH</entry> +<entry>SLBH</entry> +<entry>SLBH</entry> <entry>None</entry> </row> <row> <entry>User Context B</entry> +<entry>SLI</entry> +<entry>SLI</entry> +<entry>SLBH</entry> +<entry>SLBH</entry> +<entry>SLBH</entry> +<entry>SLBH</entry> +<entry>SLBH</entry> +<entry>SLBH</entry> +<entry>DI</entry> +<entry>None</entry> +</row> + +</tbody> +</tgroup> +</table> + + <table> +<title>Legend for Locking Requirements Table</title> +<tgroup cols="2"> +<tbody> + +<row> +<entry>SLIS</entry> +<entry>spin_lock_irqsave</entry> +</row> +<row> +<entry>SLI</entry> <entry>spin_lock_irq</entry> -<entry>spin_lock_irq</entry> -<entry>spin_lock_bh</entry> -<entry>spin_lock_bh</entry> -<entry>spin_lock_bh</entry> -<entry>spin_lock_bh</entry> -<entry>spin_lock_bh</entry> +</row> +<row> +<entry>SL</entry> +<entry>spin_lock</entry> +</row> +<row> +<entry>SLBH</entry> <entry>spin_lock_bh</entry> +</row> +<row> +<entry>DI</entry> <entry>down_interruptible</entry> -<entry>None</entry> </row> </tbody> </tgroup> </table> + </sect1> </chapter> diff --git a/Documentation/gpio.txt b/Documentation/gpio.txt index e8be0ab..36af58e 100644 --- a/Documentation/gpio.txt +++ b/Documentation/gpio.txt @@ -111,7 +111,9 @@ setting up a platform_device using the GPIO, is mark its direction: The return value is zero for success, else a negative errno. It should be checked, since the get/set calls don't have error returns and since -misconfiguration is possible. (These calls could sleep.) +misconfiguration is possible. You should normally issue these calls from +a task context. However, for spinlock-safe GPIOs it's OK to use them +before tasking is enabled, as part of early board setup. For output GPIOs, the value provided becomes the initial output value. This helps avoid signal glitching during system startup. @@ -197,7 +199,9 @@ However, many platforms don't currently support this mechanism. Passing invalid GPIO numbers to gpio_request() will fail, as will requesting GPIOs that have already been claimed with that call. The return value of -gpio_request() must be checked. (These calls could sleep.) +gpio_request() must be checked. You should normally issue these calls from +a task context. However, for spinlock-safe GPIOs it's OK to request GPIOs +before tasking is enabled, as part of early board setup. These calls serve two basic purposes. One is marking the signals which are actually in use as GPIOs, for better diagnostics; systems may have diff --git a/Documentation/vm/slabinfo.c b/Documentation/vm/slabinfo.c index 686a8e0..434af27 100644 --- a/Documentation/vm/slabinfo.c +++ b/Documentation/vm/slabinfo.c @@ -242,6 +242,9 @@ void decode_numa_list(int *numa, char *t) memset(numa, 0, MAX_NODES * sizeof(int)); + if (!t) + return; + while (*t == 'N') { t++; node = strtoul(t, &t, 10); @@ -386,7 +389,9 @@ void report(struct slabinfo *s) { if (strcmp(s->name, "*") == 0) return; - printf("\nSlabcache: %-20s Aliases: %2d Order : %2d\n", s->name, s->aliases, s->order); + + printf("\nSlabcache: %-20s Aliases: %2d Order : %2d Objects: %d\n", + s->name, s->aliases, s->order, s->objects); if (s->hwcache_align) printf("** Hardware cacheline aligned\n"); if (s->cache_dma) @@ -791,11 +796,11 @@ void totals(void) store_size(b1, total_size);store_size(b2, total_waste); store_size(b3, total_waste * 100 / total_used); - printf("Memory used: %6s # Loss : %6s MRatio: %6s%%\n", b1, b2, b3); + printf("Memory used: %6s # Loss : %6s MRatio:%6s%%\n", b1, b2, b3); store_size(b1, total_objects);store_size(b2, total_partobj); store_size(b3, total_partobj * 100 / total_objects); - printf("# Objects : %6s # PartObj: %6s ORatio: %6s%%\n", b1, b2, b3); + printf("# Objects : %6s # PartObj: %6s ORatio:%6s%%\n", b1, b2, b3); printf("\n"); printf("Per Cache Average Min Max Total\n"); @@ -818,7 +823,7 @@ void totals(void) store_size(b1, avg_ppart);store_size(b2, min_ppart); store_size(b3, max_ppart); store_size(b4, total_partial * 100 / total_slabs); - printf("%%PartSlab %10s%% %10s%% %10s%% %10s%%\n", + printf("%%PartSlab%10s%% %10s%% %10s%% %10s%%\n", b1, b2, b3, b4); store_size(b1, avg_partobj);store_size(b2, min_partobj); @@ -830,7 +835,7 @@ void totals(void) store_size(b1, avg_ppartobj);store_size(b2, min_ppartobj); store_size(b3, max_ppartobj); store_size(b4, total_partobj * 100 / total_objects); - printf("%% PartObj %10s%% %10s%% %10s%% %10s%%\n", + printf("%% PartObj%10s%% %10s%% %10s%% %10s%%\n", b1, b2, b3, b4); store_size(b1, avg_size);store_size(b2, min_size); @@ -1100,6 +1105,8 @@ void output_slabs(void) ops(slab); else if (show_slab) slabcache(slab); + else if (show_report) + report(slab); } } |