| Message ID | 20221215170234.2515030-1-arnd@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | fbdev: omapfb: avoid stack overflow warning | expand |
Hi Arnd, On Thu, Dec 15, 2022 at 6:05 PM Arnd Bergmann <arnd@kernel.org> wrote: > From: Arnd Bergmann <arnd@arndb.de> > > The dsi_irq_stats structure is a little too big to fit on the > stack of a 32-bit task, depending on the specific gcc options: > > fbdev/omap2/omapfb/dss/dsi.c: In function 'dsi_dump_dsidev_irqs': > fbdev/omap2/omapfb/dss/dsi.c:1621:1: error: the frame size of 1064 bytes is larger than 1024 bytes [-Werror=frame-larger-than=] > > Since this is only a debugfs file, performance is not critical, > so just dynamically allocate it, and print an error message > in there in place of a failure code when the allocation fails. > > Signed-off-by: Arnd Bergmann <arnd@arndb.de> Thanks for your patch! > --- a/drivers/video/fbdev/omap2/omapfb/dss/dsi.c > +++ b/drivers/video/fbdev/omap2/omapfb/dss/dsi.c > @@ -1536,22 +1536,28 @@ static void dsi_dump_dsidev_irqs(struct platform_device *dsidev, > { > struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev); > unsigned long flags; > - struct dsi_irq_stats stats; > + struct dsi_irq_stats *stats; > + > + stats = kzalloc(sizeof(*stats), GFP_KERNEL); > + if (!stats) { > + seq_printf(s, "out of memory\n"); I guess this is futile? No need to increase kernel size for OOM messages. > + return; > + } > > spin_lock_irqsave(&dsi->irq_stats_lock, flags); Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
On 12/15/22 18:02, Arnd Bergmann wrote: > From: Arnd Bergmann <arnd@arndb.de> > > The dsi_irq_stats structure is a little too big to fit on the > stack of a 32-bit task, depending on the specific gcc options: > > fbdev/omap2/omapfb/dss/dsi.c: In function 'dsi_dump_dsidev_irqs': > fbdev/omap2/omapfb/dss/dsi.c:1621:1: error: the frame size of 1064 bytes is larger than 1024 bytes [-Werror=frame-larger-than=] > > Since this is only a debugfs file, performance is not critical, > so just dynamically allocate it, and print an error message > in there in place of a failure code when the allocation fails. > > Signed-off-by: Arnd Bergmann <arnd@arndb.de> applied to fbdev git tree. Thanks! Helge > --- > drivers/video/fbdev/omap2/omapfb/dss/dsi.c | 28 ++++++++++++++-------- > 1 file changed, 18 insertions(+), 10 deletions(-) > > diff --git a/drivers/video/fbdev/omap2/omapfb/dss/dsi.c b/drivers/video/fbdev/omap2/omapfb/dss/dsi.c > index 54b0f034c2ed..7cddb7b8ae34 100644 > --- a/drivers/video/fbdev/omap2/omapfb/dss/dsi.c > +++ b/drivers/video/fbdev/omap2/omapfb/dss/dsi.c > @@ -1536,22 +1536,28 @@ static void dsi_dump_dsidev_irqs(struct platform_device *dsidev, > { > struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev); > unsigned long flags; > - struct dsi_irq_stats stats; > + struct dsi_irq_stats *stats; > + > + stats = kzalloc(sizeof(*stats), GFP_KERNEL); > + if (!stats) { > + seq_printf(s, "out of memory\n"); > + return; > + } > > spin_lock_irqsave(&dsi->irq_stats_lock, flags); > > - stats = dsi->irq_stats; > + *stats = dsi->irq_stats; > memset(&dsi->irq_stats, 0, sizeof(dsi->irq_stats)); > dsi->irq_stats.last_reset = jiffies; > > spin_unlock_irqrestore(&dsi->irq_stats_lock, flags); > > seq_printf(s, "period %u ms\n", > - jiffies_to_msecs(jiffies - stats.last_reset)); > + jiffies_to_msecs(jiffies - stats->last_reset)); > > - seq_printf(s, "irqs %d\n", stats.irq_count); > + seq_printf(s, "irqs %d\n", stats->irq_count); > #define PIS(x) \ > - seq_printf(s, "%-20s %10d\n", #x, stats.dsi_irqs[ffs(DSI_IRQ_##x)-1]) > + seq_printf(s, "%-20s %10d\n", #x, stats->dsi_irqs[ffs(DSI_IRQ_##x)-1]) > > seq_printf(s, "-- DSI%d interrupts --\n", dsi->module_id + 1); > PIS(VC0); > @@ -1575,10 +1581,10 @@ static void dsi_dump_dsidev_irqs(struct platform_device *dsidev, > > #define PIS(x) \ > seq_printf(s, "%-20s %10d %10d %10d %10d\n", #x, \ > - stats.vc_irqs[0][ffs(DSI_VC_IRQ_##x)-1], \ > - stats.vc_irqs[1][ffs(DSI_VC_IRQ_##x)-1], \ > - stats.vc_irqs[2][ffs(DSI_VC_IRQ_##x)-1], \ > - stats.vc_irqs[3][ffs(DSI_VC_IRQ_##x)-1]); > + stats->vc_irqs[0][ffs(DSI_VC_IRQ_##x)-1], \ > + stats->vc_irqs[1][ffs(DSI_VC_IRQ_##x)-1], \ > + stats->vc_irqs[2][ffs(DSI_VC_IRQ_##x)-1], \ > + stats->vc_irqs[3][ffs(DSI_VC_IRQ_##x)-1]); > > seq_printf(s, "-- VC interrupts --\n"); > PIS(CS); > @@ -1594,7 +1600,7 @@ static void dsi_dump_dsidev_irqs(struct platform_device *dsidev, > > #define PIS(x) \ > seq_printf(s, "%-20s %10d\n", #x, \ > - stats.cio_irqs[ffs(DSI_CIO_IRQ_##x)-1]); > + stats->cio_irqs[ffs(DSI_CIO_IRQ_##x)-1]); > > seq_printf(s, "-- CIO interrupts --\n"); > PIS(ERRSYNCESC1); > @@ -1618,6 +1624,8 @@ static void dsi_dump_dsidev_irqs(struct platform_device *dsidev, > PIS(ULPSACTIVENOT_ALL0); > PIS(ULPSACTIVENOT_ALL1); > #undef PIS > + > + kfree(stats); > } > > static void dsi1_dump_irqs(struct seq_file *s)
diff --git a/drivers/video/fbdev/omap2/omapfb/dss/dsi.c b/drivers/video/fbdev/omap2/omapfb/dss/dsi.c index 54b0f034c2ed..7cddb7b8ae34 100644 --- a/drivers/video/fbdev/omap2/omapfb/dss/dsi.c +++ b/drivers/video/fbdev/omap2/omapfb/dss/dsi.c @@ -1536,22 +1536,28 @@ static void dsi_dump_dsidev_irqs(struct platform_device *dsidev, { struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev); unsigned long flags; - struct dsi_irq_stats stats; + struct dsi_irq_stats *stats; + + stats = kzalloc(sizeof(*stats), GFP_KERNEL); + if (!stats) { + seq_printf(s, "out of memory\n"); + return; + } spin_lock_irqsave(&dsi->irq_stats_lock, flags); - stats = dsi->irq_stats; + *stats = dsi->irq_stats; memset(&dsi->irq_stats, 0, sizeof(dsi->irq_stats)); dsi->irq_stats.last_reset = jiffies; spin_unlock_irqrestore(&dsi->irq_stats_lock, flags); seq_printf(s, "period %u ms\n", - jiffies_to_msecs(jiffies - stats.last_reset)); + jiffies_to_msecs(jiffies - stats->last_reset)); - seq_printf(s, "irqs %d\n", stats.irq_count); + seq_printf(s, "irqs %d\n", stats->irq_count); #define PIS(x) \ - seq_printf(s, "%-20s %10d\n", #x, stats.dsi_irqs[ffs(DSI_IRQ_##x)-1]) + seq_printf(s, "%-20s %10d\n", #x, stats->dsi_irqs[ffs(DSI_IRQ_##x)-1]) seq_printf(s, "-- DSI%d interrupts --\n", dsi->module_id + 1); PIS(VC0); @@ -1575,10 +1581,10 @@ static void dsi_dump_dsidev_irqs(struct platform_device *dsidev, #define PIS(x) \ seq_printf(s, "%-20s %10d %10d %10d %10d\n", #x, \ - stats.vc_irqs[0][ffs(DSI_VC_IRQ_##x)-1], \ - stats.vc_irqs[1][ffs(DSI_VC_IRQ_##x)-1], \ - stats.vc_irqs[2][ffs(DSI_VC_IRQ_##x)-1], \ - stats.vc_irqs[3][ffs(DSI_VC_IRQ_##x)-1]); + stats->vc_irqs[0][ffs(DSI_VC_IRQ_##x)-1], \ + stats->vc_irqs[1][ffs(DSI_VC_IRQ_##x)-1], \ + stats->vc_irqs[2][ffs(DSI_VC_IRQ_##x)-1], \ + stats->vc_irqs[3][ffs(DSI_VC_IRQ_##x)-1]); seq_printf(s, "-- VC interrupts --\n"); PIS(CS); @@ -1594,7 +1600,7 @@ static void dsi_dump_dsidev_irqs(struct platform_device *dsidev, #define PIS(x) \ seq_printf(s, "%-20s %10d\n", #x, \ - stats.cio_irqs[ffs(DSI_CIO_IRQ_##x)-1]); + stats->cio_irqs[ffs(DSI_CIO_IRQ_##x)-1]); seq_printf(s, "-- CIO interrupts --\n"); PIS(ERRSYNCESC1); @@ -1618,6 +1624,8 @@ static void dsi_dump_dsidev_irqs(struct platform_device *dsidev, PIS(ULPSACTIVENOT_ALL0); PIS(ULPSACTIVENOT_ALL1); #undef PIS + + kfree(stats); } static void dsi1_dump_irqs(struct seq_file *s)